v3.25.3
Fair Value - Schedule of Gross Components of Purchases, Issuances, Sales and Settlements, Net, and Net Transfers In (Out) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Asset Management        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases $ 2,584 $ 1,040 $ 3,902 $ 3,149
Issuances 0 0 0 0
Sales (608) (1,178) (1,914) (3,168)
Settlements 0 0 0 0
Net Purchases, Issuances, Sales and Settlements 1,976 (138) 1,988 (19)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In 0 452 0 452
Transfers Out (134) (68) (801) (138)
Net Transfers In (Out) (134) 384 (801) 314
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (5) (6) (19) (105)
Net Purchases, Issuances, Sales and Settlements (5) (6) (19) (105)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net [Abstract]        
Transfers In 0 0 0 0
Transfers Out 0 0 0 0
Net Transfers In (Out) 0 0 0 0
Asset Management | Contingent consideration obligations        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (5) (6) (19) (105)
Net Purchases, Issuances, Sales and Settlements (5) (6) (19) (105)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net [Abstract]        
Transfers In 0 0 0 0
Transfers Out 0 0 0 0
Net Transfers In (Out) 0 0 0 0
Asset Management | Investments and derivative assets        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 54 7 83 27
Issuances 0 0 0 0
Sales (3) (46) (13) (61)
Settlements 0 0 0 0
Net Purchases, Issuances, Sales and Settlements 51 (39) 70 (34)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In 0 0 0 0
Transfers Out 0 (68) 0 (68)
Net Transfers In (Out) 0 (68) 0 (68)
Asset Management | Investments, at fair value        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Net Purchases, Issuances, Sales and Settlements       (34)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Net Transfers In (Out)       (68)
Asset Management | VIE, Primary Beneficiary | Investments, at fair value        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 2,530 1,033 3,819 3,122
Issuances 0 0 0 0
Sales (605) (1,132) (1,901) (3,107)
Settlements 0 0 0 0
Net Purchases, Issuances, Sales and Settlements 1,925 (99) 1,918 15
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In 0 452 0 452
Transfers Out (134) 0 (801) (70)
Net Transfers In (Out) (134) 452 (801) 382
Retirement Services        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 17,539 13,401 45,327 38,658
Issuances 56 94 146 294
Sales (1,199) (371) (2,364) (1,073)
Settlements (5,946) (5,450) (14,530) (10,393)
Net Purchases, Issuances, Sales and Settlements 10,450 7,674 28,579 27,486
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In 209 4,999 933 978
Transfers Out (1,894) (5,847) (7,471) (2,504)
Net Transfers In (Out) (1,685) (848) (6,538) (1,526)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 0 0 0 0
Issuances (1,002) (750) (2,615) (2,408)
Sales 0 0 0 0
Settlements 324 265 788 793
Net Purchases, Issuances, Sales and Settlements (678) (485) (1,827) (1,615)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net [Abstract]        
Transfers In 0 0 0 64
Transfers Out 0 0 0 0
Net Transfers In (Out) 0 0 0 64
Retirement Services | Short-term investments        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Net Purchases, Issuances, Sales and Settlements (763) (487) (1,913) (1,667)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net [Abstract]        
Net Transfers In (Out) 0 0 0 0
Retirement Services | Interest sensitive contract liabilities        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases     0 0
Issuances     (2,615) (2,408)
Sales     0 0
Settlements     702 741
Net Purchases, Issuances, Sales and Settlements   (487) (1,913) (1,667)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net [Abstract]        
Transfers In     0 0
Transfers Out     0 0
Net Transfers In (Out)   0 0 0
Retirement Services | AmerUs Life Insurance Company (“AmerUs”) Closed Block        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Net Purchases, Issuances, Sales and Settlements 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net [Abstract]        
Net Transfers In (Out) 0 0 0 0
Retirement Services | Indianapolis Life Insurance Company (“ILICO”) Closed Block and life benefits        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Net Purchases, Issuances, Sales and Settlements 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net [Abstract]        
Net Transfers In (Out) 0 0 0 0
Retirement Services | Derivative liabilities        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Net Purchases, Issuances, Sales and Settlements   0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net [Abstract]        
Net Transfers In (Out)   0 0 0
Retirement Services | Other liabilities        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 0 0 0 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements 85 2 86 52
Net Purchases, Issuances, Sales and Settlements 85 2 86 52
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net [Abstract]        
Transfers In 0 0 0 64
Transfers Out 0 0 0 0
Net Transfers In (Out) 0 0 0 64
Retirement Services | Short-term investments | Short-term investments        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 0      
Issuances (1,002)      
Sales 0      
Settlements 239      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net [Abstract]        
Transfers In 0      
Transfers Out 0      
Retirement Services | Short-term investments | Interest sensitive contract liabilities        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases   0    
Issuances   (750)    
Sales   0    
Settlements   263    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net [Abstract]        
Transfers In   0    
Transfers Out   0    
Retirement Services | AFS securities | Foreign governments        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases     0 0
Issuances     0 0
Sales     0 0
Settlements     (5) (6)
Net Purchases, Issuances, Sales and Settlements     (5) (6)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In     0 0
Transfers Out     0 0
Net Transfers In (Out)     0 0
Retirement Services | AFS securities | Corporate        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 479 912 3,906 2,623
Issuances 0 0 0 0
Sales (94) (16) (100) (18)
Settlements (64) (121) (414) (218)
Net Purchases, Issuances, Sales and Settlements 321 775 3,392 2,387
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In 125 68 251 166
Transfers Out (1,333) (4,868) (1,607) (993)
Net Transfers In (Out) (1,208) (4,800) (1,356) (827)
Retirement Services | AFS securities | ABS        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 4,385 3,004 7,177 9,635
Issuances 0 0 0 0
Sales (3) (351) (26) (423)
Settlements (1,036) (451) (1,960) (841)
Net Purchases, Issuances, Sales and Settlements 3,346 2,202 5,191 8,371
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In 0 4,897 479 748
Transfers Out (547) (218) (5,734) (747)
Net Transfers In (Out) (547) 4,679 (5,255) 1
Retirement Services | AFS securities | CMBS        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases     28  
Issuances     0  
Sales     0  
Settlements     0  
Net Purchases, Issuances, Sales and Settlements     28  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In     13  
Transfers Out     (14)  
Net Transfers In (Out)     (1)  
Retirement Services | AFS securities | RMBS        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 18 81 315 81
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (32) (3) (48) (9)
Net Purchases, Issuances, Sales and Settlements (14) 78 267 72
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In 0 0 0 0
Transfers Out 0 0 (49) (2)
Net Transfers In (Out) 0 0 (49) (2)
Retirement Services | Trading securities        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 0 0 11 0
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (1) (1) (2) (6)
Net Purchases, Issuances, Sales and Settlements (1) (1) 9 (6)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In 0 0 0 14
Transfers Out 0 0 (14) 0
Net Transfers In (Out) 0 0 (14) 14
Retirement Services | Equity securities        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases   0 0 2
Issuances   0 0 0
Sales   0 0 (1)
Settlements   0 (18) 0
Net Purchases, Issuances, Sales and Settlements 0 0 (18) 1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In   0 0 9
Transfers Out   (9) 0 (9)
Net Transfers In (Out) 0 (9) 0 0
Retirement Services | Mortgage loans        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 8,160 7,518 25,920 19,226
Issuances 0 0 0 0
Sales 0 0 (172) (26)
Settlements (3,724) (2,672) (9,034) (5,553)
Net Purchases, Issuances, Sales and Settlements 4,436 4,846 16,714 13,647
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In 0 0 0 0
Transfers Out 0 0 0 0
Net Transfers In (Out) 0 0 0 0
Retirement Services | Short-term investments        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Net Purchases, Issuances, Sales and Settlements 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Net Transfers In (Out) 0 0 0 0
Retirement Services | Derivative assets        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases       0
Issuances       0
Sales       0
Settlements       0
Net Purchases, Issuances, Sales and Settlements 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In       1
Transfers Out       0
Net Transfers In (Out) 0 0 0 1
Retirement Services | Short-term investments        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 18 168 30 171
Issuances 0 0 0 0
Sales 0 0 0 (6)
Settlements (12) (2) (180) (23)
Net Purchases, Issuances, Sales and Settlements 6 166 (150) 142
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In 0 0 0 0
Transfers Out 0 (78) (1) (79)
Net Transfers In (Out) 0 (78) (1) (79)
Retirement Services | Other investments        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 199   199 280
Issuances 0   0 0
Sales 0   0 0
Settlements (71)   (227) 0
Net Purchases, Issuances, Sales and Settlements 128 0 (28) 280
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In 0   0 0
Transfers Out 0   0 0
Net Transfers In (Out) 0 0 0 0
Retirement Services | Reinsurance recoverable        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 0   0  
Issuances 56   146  
Sales 0   0  
Settlements (4)   (10)  
Net Purchases, Issuances, Sales and Settlements 52 93 136 292
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In 0   0  
Transfers Out 0   0  
Net Transfers In (Out) 0 0 0 0
Retirement Services | Related Party | AFS securities | Corporate        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 102 0 107 6
Issuances 0 0 0 0
Sales 0 0 0 (1)
Settlements (2) (3) (8) (7)
Net Purchases, Issuances, Sales and Settlements 100 (3) 99 (2)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In 3 0 3 0
Transfers Out 0 (154) 0 (154)
Net Transfers In (Out) 3 (154) 3 (154)
Retirement Services | Related Party | AFS securities | CLO        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 0 42 376 42
Issuances 0 0 0 0
Sales 0 0 0 0
Settlements (373) 0 (373) 0
Net Purchases, Issuances, Sales and Settlements (373) 42 3 42
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In 0 0 0 0
Transfers Out 0 0 0 0
Net Transfers In (Out) 0 0 0 0
Retirement Services | Related Party | AFS securities | ABS        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 3,712 1,193 5,971 5,780
Issuances 0 0 0 0
Sales (179) 0 (179) (504)
Settlements (550) (2,067) (1,792) (3,361)
Net Purchases, Issuances, Sales and Settlements 2,983 (874) 4,000 1,915
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In 0 0 14 0
Transfers Out (8) 0 (23) 0
Net Transfers In (Out) (8) 0 (9) 0
Retirement Services | Related Party | Trading securities        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 28 0 98 4
Issuances 0 0 0 0
Sales 0 0 (91) 0
Settlements (12) (100) (167) (222)
Net Purchases, Issuances, Sales and Settlements 16 (100) (160) (218)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In 1 0 3 0
Transfers Out 0 0 0 0
Net Transfers In (Out) 1 0 3 0
Retirement Services | Related Party | Equity securities        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Net Purchases, Issuances, Sales and Settlements 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Net Transfers In (Out) 0 0 0 0
Retirement Services | Related Party | Mortgage loans        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 75 0 75 87
Issuances 0 0 0 0
Sales 0 0 (15) 0
Settlements (5) (14) (36) (64)
Net Purchases, Issuances, Sales and Settlements 70 (14) 24 23
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In 0 0 0 0
Transfers Out 0 0 0 0
Net Transfers In (Out) 0 0 0 0
Retirement Services | Related Party | Investment funds        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases     3  
Issuances     0  
Sales     0  
Settlements     0  
Net Purchases, Issuances, Sales and Settlements 0 0 3 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In     0  
Transfers Out     0  
Net Transfers In (Out) 0 0 0 0
Retirement Services | Related Party | Short-term investments        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Net Purchases, Issuances, Sales and Settlements 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Net Transfers In (Out) 0 0 0 0
Retirement Services | Related Party | Other investments        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Net Purchases, Issuances, Sales and Settlements 0 0 0 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Net Transfers In (Out) 0 0 0 0
Retirement Services | VIE, Primary Beneficiary | Trading securities        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 30 38 465 201
Issuances 0 0 0 0
Sales (486) (4) (821) (91)
Settlements 0 0 0 (7)
Net Purchases, Issuances, Sales and Settlements (456) 34 (356) 103
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In 80 34 170 40
Transfers Out 0 (88) (23) (88)
Net Transfers In (Out) 80 (54) 147 (48)
Retirement Services | VIE, Primary Beneficiary | Mortgage loans        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 32 70 66 125
Issuances 0 0 0 0
Sales (436) 0 (446) 0
Settlements (60) (15) (256) (74)
Net Purchases, Issuances, Sales and Settlements (464) 55 (636) 51
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In 0 0 0 0
Transfers Out (1) 0 (1) 0
Net Transfers In (Out) (1) 0 (1) 0
Retirement Services | VIE, Primary Beneficiary | Investment funds        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 0 338 0 339
Issuances 0 0 0 0
Sales (1) 0 (498) 0
Settlements 0 0 0 0
Net Purchases, Issuances, Sales and Settlements (1) 338 (498) 339
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In 0 0 0 0
Transfers Out 0 (432) 0 (432)
Net Transfers In (Out) 0 (432) 0 (432)
Retirement Services | VIE, Primary Beneficiary | Other investments        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases 301 37 580 56
Issuances 0 0 0 0
Sales 0 0 (16) (3)
Settlements 0 0 0 0
Net Purchases, Issuances, Sales and Settlements 301 37 564 53
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In 0 0 0 0
Transfers Out (5) 0 (5) 0
Net Transfers In (Out) $ (5) 0 $ (5) 0
Retirement Services | VIE, Primary Beneficiary | Reinsurance recoverable        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract]        
Purchases   0   0
Issuances   94   294
Sales   0   0
Settlements   (1)   (2)
Net Purchases, Issuances, Sales and Settlements   93   292
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]        
Transfers In   0   0
Transfers Out   0   0
Net Transfers In (Out)   $ 0   $ 0