v3.24.0.1
Insurance Liabilities - Balances of changes in liability for future policy benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]          
Balance, beginning of year $ 14,574        
Effect of changes in discount rate assumptions (AOCI) (2,200)        
Beginning balance at original discount rate 16,774        
Effect of changes in cash flow assumptions   $ 53      
Effect of actual variances from expected experience   66      
Adjusted beginning of year balance 16,893        
Issuances 1,399        
Interest accrual 526        
Net premium collected (1,865)        
Foreign exchange impact 251        
Other 2        
Ending balance at original discount rate 17,206 16,774      
Effect of changes in discount rate assumptions (AOCI) (1,865) (2,200)      
Reclassified to Liabilities held for sale (4,287)        
Balance, end of period 11,054 14,574      
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]          
Beginning balance 57,886        
Effect of changes in discount rate assumptions (AOCI) (7,672)        
Beginning balance at original discount rate 65,558        
Adjustments   125      
Effect of actual variances from expected experience   112      
Adjusted beginning of year balance 65,795        
Issuances 6,930        
Interest accrual 2,716        
Benefit payments (4,941)        
Foreign exchange impact 677        
Other (14)        
Ending balance at original discount rate 71,163 65,558      
Effect of changes in discount rate assumptions (AOCI) (5,658) (7,672)      
Reclassified to Liabilities held for sale (5,119)        
Ending balance 60,386 57,886      
Net liability for future policy benefits, end of period 49,332        
Liability for future policy benefits for certain participating contracts 1,313        
Liability for universal life policies with secondary guarantees and similar features 3,786        
Deferred profit liability 2,512        
Other reconciling items 1,633        
Future policy benefits for life and accident and health insurance contracts 58,576 51,914   $ 67,364  
Less: Reinsurance recoverable: (23,571)        
Net liability for future policy benefits after reinsurance recoverable 35,005        
General Insurance          
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]          
Balance, beginning of year 1,929        
Effect of changes in discount rate assumptions (AOCI) (262)        
Beginning balance at original discount rate 2,191        
Effect of changes in cash flow assumptions   (2)      
Effect of actual variances from expected experience   (16)      
Adjusted beginning of year balance 2,173        
Issuances 122        
Interest accrual 43        
Net premium collected (283)        
Foreign exchange impact (14)        
Other 0        
Ending balance at original discount rate 2,041 2,191      
Effect of changes in discount rate assumptions (AOCI) (339) (262)      
Reclassified to Liabilities held for sale 0        
Balance, end of period 1,702 1,929      
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]          
Beginning balance 2,380        
Effect of changes in discount rate assumptions (AOCI) (362)        
Beginning balance at original discount rate 2,742        
Adjustments   (13)      
Effect of actual variances from expected experience   (18)      
Adjusted beginning of year balance 2,711        
Issuances 130        
Interest accrual 52        
Benefit payments (276)        
Foreign exchange impact (27)        
Other 0        
Ending balance at original discount rate 2,590 2,742      
Effect of changes in discount rate assumptions (AOCI) (441) (362)      
Reclassified to Liabilities held for sale 0        
Ending balance 2,149 2,380      
Net liability for future policy benefits, end of period $ 447        
Weighted average liability duration of the liability for future policy benefits (in years) 9 years 3 months 18 days        
Life and Retirement          
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]          
Balance, beginning of year $ 12,645 15,643 $ 15,299    
Effect of changes in discount rate assumptions (AOCI) (1,938) 856 1,623    
Beginning balance at original discount rate 14,583 14,787 13,676    
Effect of changes in cash flow assumptions     123   $ 92
Effect of actual variances from expected experience     (72)   385
Adjusted beginning of year balance   14,838 14,153    
Issuances   1,358 1,727    
Interest accrual   445 446    
Net premium collected   (1,541) (1,493)    
Foreign exchange impact   (517) (46)    
Other   0 0    
Ending balance at original discount rate   14,583 14,787    
Effect of changes in discount rate assumptions (AOCI)   (1,938) 856    
Balance, end of period   12,645 15,643    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]          
Beginning balance 55,506 70,643 71,668    
Effect of changes in discount rate assumptions (AOCI) (7,310) 9,401 14,086    
Beginning balance at original discount rate 62,816 61,242 57,582    
Adjustments     134   110
Effect of actual variances from expected experience     (122)   289
Adjusted beginning of year balance   61,254 57,981    
Issuances   4,393 5,287    
Interest accrual   2,620 2,393    
Benefit payments   (4,203) (4,336)    
Foreign exchange impact   (996) (63)    
Other   (252) (20)    
Ending balance at original discount rate   62,816 61,242    
Effect of changes in discount rate assumptions (AOCI)   (7,310) 9,401    
Ending balance   55,506 70,643    
Net liability for future policy benefits, end of period   42,861 55,000    
Liability for future policy benefits for certain participating contracts   1,352 1,397    
Liability for universal life policies with secondary guarantees and similar features   3,355 5,007    
Deferred profit liability   2,303 2,236    
Other reconciling items   2,043 2,759    
Future policy benefits for life and accident and health insurance contracts   51,914 66,399    
Less: Reinsurance recoverable:   (24,078) (32,586)    
Net liability for future policy benefits after reinsurance recoverable   27,836 33,813    
Life and Retirement | Individual Retirement          
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]          
Balance, beginning of year 0 0 0    
Effect of changes in discount rate assumptions (AOCI) 0 0 0    
Beginning balance at original discount rate 0 0 0    
Effect of changes in cash flow assumptions   0 0   0
Effect of actual variances from expected experience   0 0   0
Adjusted beginning of year balance 0 0 0    
Issuances 0 0 0    
Interest accrual 0 0 0    
Net premium collected 0 0 0    
Foreign exchange impact 0 0 0    
Other 0 0 0    
Ending balance at original discount rate 0 0 0    
Effect of changes in discount rate assumptions (AOCI) 0 0 0    
Reclassified to Liabilities held for sale 0        
Balance, end of period 0 0 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]          
Beginning balance 1,223 1,373 1,322    
Effect of changes in discount rate assumptions (AOCI) (167) 95 156    
Beginning balance at original discount rate 1,390 1,278 1,166    
Adjustments   0 0   0
Effect of actual variances from expected experience   (5) (30)   1
Adjusted beginning of year balance 1,385 1,248 1,167    
Issuances 173 216 172    
Interest accrual 55 42 41    
Benefit payments (128) (116) (101)    
Foreign exchange impact 0 0 0    
Other 0 0 (1)    
Ending balance at original discount rate 1,485 1,390 1,278    
Effect of changes in discount rate assumptions (AOCI) (132) (167) 95    
Reclassified to Liabilities held for sale 0        
Ending balance 1,353 1,223 1,373    
Net liability for future policy benefits, end of period $ 1,353 $ 1,223 $ 1,373    
Weighted average liability duration of the liability for future policy benefits (in years) 7 years 9 months 18 days 7 years 7 months 6 days 8 years 7 months 6 days    
Life and Retirement | Group Retirement          
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]          
Balance, beginning of year $ 0 $ 0 $ 0    
Effect of changes in discount rate assumptions (AOCI) 0 0 0    
Beginning balance at original discount rate 0 0 0    
Effect of changes in cash flow assumptions   0 0   0
Effect of actual variances from expected experience   0 0   0
Adjusted beginning of year balance 0 0 0    
Issuances 0 0 0    
Interest accrual 0 0 0    
Net premium collected 0 0 0    
Foreign exchange impact 0 0 0    
Other 0 0 0    
Ending balance at original discount rate 0 0 0    
Effect of changes in discount rate assumptions (AOCI) 0 0 0    
Reclassified to Liabilities held for sale 0        
Balance, end of period 0 0 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]          
Beginning balance 211 264 279    
Effect of changes in discount rate assumptions (AOCI) (2) 46 63    
Beginning balance at original discount rate 213 218 216    
Adjustments   0 0   0
Effect of actual variances from expected experience   (2) (2)   (1)
Adjusted beginning of year balance 211 216 215    
Issuances 18 12 21    
Interest accrual 11 10 11    
Benefit payments (26) (26) (28)    
Foreign exchange impact 0 0 0    
Other 0 1 (1)    
Ending balance at original discount rate 214 213 218    
Effect of changes in discount rate assumptions (AOCI) 3 (2) 46    
Reclassified to Liabilities held for sale 0        
Ending balance 217 211 264    
Net liability for future policy benefits, end of period $ 217 $ 211 $ 264    
Weighted average liability duration of the liability for future policy benefits (in years) 6 years 9 months 18 days 6 years 10 months 24 days 7 years 9 months 18 days    
Life and Retirement | Life Insurance          
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]          
Balance, beginning of year $ 11,654 $ 14,369 $ 13,793    
Effect of changes in discount rate assumptions (AOCI) (1,872) 706 1,374    
Beginning balance at original discount rate 13,526 13,663 12,419    
Effect of changes in cash flow assumptions   34 123   164
Effect of actual variances from expected experience   62 (79)   371
Adjusted beginning of year balance 13,622 13,707 12,954    
Issuances 1,277 1,358 1,727    
Interest accrual 437 397 392    
Net premium collected (1,464) (1,418) (1,364)    
Foreign exchange impact 265 (517) (46)    
Other 11 (1) 0    
Ending balance at original discount rate 14,148 13,526 13,663    
Effect of changes in discount rate assumptions (AOCI) (1,482) (1,872) 706    
Reclassified to Liabilities held for sale (4,287)        
Balance, end of period 8,379 11,654 14,369    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]          
Beginning balance 21,179 27,442 27,918    
Effect of changes in discount rate assumptions (AOCI) (3,424) 2,717 4,351    
Beginning balance at original discount rate 24,603 24,725 23,567    
Adjustments   62 140   193
Effect of actual variances from expected experience   122 (94)   413
Adjusted beginning of year balance 24,787 24,771 24,173    
Issuances 1,266 1,374 1,713    
Interest accrual 908 876 876    
Benefit payments (1,921) (1,757) (1,981)    
Foreign exchange impact 345 (657) (60)    
Other 10 (4) 4    
Ending balance at original discount rate 25,395 24,603 24,725    
Effect of changes in discount rate assumptions (AOCI) (2,745) (3,424) 2,717    
Reclassified to Liabilities held for sale (5,119)        
Ending balance 17,531 21,179 27,442    
Net liability for future policy benefits, end of period $ 9,152 $ 9,525 $ 13,073    
Weighted average liability duration of the liability for future policy benefits (in years) 12 years 9 months 18 days 12 years 2 months 12 days 14 years 4 months 24 days    
Life and Retirement | Institutional Markets          
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]          
Balance, beginning of year $ 0 $ 0 $ 0    
Effect of changes in discount rate assumptions (AOCI) 0 0 0    
Beginning balance at original discount rate 0 0 0    
Effect of changes in cash flow assumptions   0 0   0
Effect of actual variances from expected experience   0 0   0
Adjusted beginning of year balance 0 0 0    
Issuances 0 0 0    
Interest accrual 0 0 0    
Net premium collected 0 0 0    
Foreign exchange impact 0 0 0    
Other 0 0 0    
Ending balance at original discount rate 0 0 0    
Effect of changes in discount rate assumptions (AOCI) 0 0 0    
Reclassified to Liabilities held for sale 0        
Balance, end of period 0 0 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]          
Beginning balance 12,464 13,890 11,630    
Effect of changes in discount rate assumptions (AOCI) (2,634) 870 1,654    
Beginning balance at original discount rate 15,098 13,020 9,976    
Adjustments   0 (6)   0
Effect of actual variances from expected experience   15 3   (3)
Adjusted beginning of year balance 15,113 13,017 9,973    
Issuances 5,339 2,782 3,366    
Interest accrual 664 459 380    
Benefit payments (1,087) (821) (696)    
Foreign exchange impact 359 (339) (3)    
Other 0 0 0    
Ending balance at original discount rate 20,388 15,098 13,020    
Effect of changes in discount rate assumptions (AOCI) (1,906) (2,634) 870    
Reclassified to Liabilities held for sale 0        
Ending balance 18,482 12,464 13,890    
Net liability for future policy benefits, end of period $ 18,482 $ 12,464 $ 13,890    
Weighted average liability duration of the liability for future policy benefits (in years) 12 years 1 month 6 days 10 years 9 months 18 days 13 years    
Life and Retirement | Other          
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]          
Balance, beginning of year $ 991 $ 1,274 $ 1,506    
Effect of changes in discount rate assumptions (AOCI) (66) 150 249    
Beginning balance at original discount rate 1,057 1,124 1,257    
Effect of changes in cash flow assumptions   21 0   (72)
Effect of actual variances from expected experience   20 7   14
Adjusted beginning of year balance 1,098 1,131 1,199    
Issuances 0 0 0    
Interest accrual 46 48 54    
Net premium collected (118) (123) (129)    
Foreign exchange impact 0 0 0    
Other (9) 1 0    
Ending balance at original discount rate 1,017 1,057 1,124    
Effect of changes in discount rate assumptions (AOCI) (44) (66) 150    
Reclassified to Liabilities held for sale 0        
Balance, end of period 973 991 1,274    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]          
Beginning balance 20,429 27,674 30,519    
Effect of changes in discount rate assumptions (AOCI) (1,083) 5,673 7,862    
Beginning balance at original discount rate 21,512 22,001 22,657    
Adjustments   76 0   (83)
Effect of actual variances from expected experience   0 1   $ (121)
Adjusted beginning of year balance 21,588 22,002 22,453    
Issuances 4 9 15    
Interest accrual 1,026 1,233 1,085    
Benefit payments (1,503) (1,483) (1,530)    
Foreign exchange impact 0 0 0    
Other (24) (249) (22)    
Ending balance at original discount rate 21,091 21,512 22,001    
Effect of changes in discount rate assumptions (AOCI) (437) (1,083) 5,673    
Reclassified to Liabilities held for sale 0        
Ending balance 20,654 20,429 27,674    
Net liability for future policy benefits, end of period $ 19,681 $ 19,438 $ 26,400    
Weighted average liability duration of the liability for future policy benefits (in years) 11 years 6 months 11 years 4 months 24 days 13 years 8 months 12 days