v3.26.1
Derivative instruments - Secured Borrowings (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements $ 281,158 $ 269,352
Securities lending 22,087 12,840
Total borrowings 303,245 282,192
Overnight and continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 270,954 259,550
Securities lending 22,087 12,840
Total borrowings 293,041 272,390
Up to 30 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 1,125 1,496
Securities lending 0 0
Total borrowings 1,125 1,496
30-90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 4,149 4,151
Securities lending 0 0
Total borrowings 4,149 4,151
Over 90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 4,930 4,155
Securities lending 0 0
Total borrowings 4,930 4,155
U.S. Treasury    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 178,546 211,596
Securities lending 2,092 754
U.S. Treasury | Overnight and continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 174,719 207,600
Securities lending 2,092 754
U.S. Treasury | Up to 30 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 180 475
Securities lending 0 0
U.S. Treasury | 30-90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 1,378 1,420
Securities lending 0 0
U.S. Treasury | Over 90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 2,269 2,101
Securities lending 0 0
Agency residential mortgage-backed securities (“RMBS”)    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 96,009 51,944
Securities lending 0 102
Agency residential mortgage-backed securities (“RMBS”) | Overnight and continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 95,052 51,130
Securities lending 0 102
Agency residential mortgage-backed securities (“RMBS”) | Up to 30 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 119 136
Securities lending 0 0
Agency residential mortgage-backed securities (“RMBS”) | 30-90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 433 237
Securities lending 0 0
Agency residential mortgage-backed securities (“RMBS”) | Over 90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 405 441
Securities lending 0 0
Corporate bonds    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 1,746 1,987
Securities lending 988 783
Corporate bonds | Overnight and continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 70 119
Securities lending 988 783
Corporate bonds | Up to 30 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 214 55
Securities lending 0 0
Corporate bonds | 30-90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 761 1,256
Securities lending 0 0
Corporate bonds | Over 90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 701 557
Securities lending 0 0
State and political subdivisions    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 1,341 731
State and political subdivisions | Overnight and continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 52 17
State and political subdivisions | Up to 30 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 24 25
State and political subdivisions | 30-90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 347 361
State and political subdivisions | Over 90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 918 328
Sovereign debt/sovereign guaranteed    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 1,201 957
Sovereign debt/sovereign guaranteed | Overnight and continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 727 541
Sovereign debt/sovereign guaranteed | Up to 30 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 474 416
Sovereign debt/sovereign guaranteed | 30-90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 0 0
Sovereign debt/sovereign guaranteed | Over 90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 0 0
U.S. government agencies    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 332 140
Securities lending 0 2
U.S. government agencies | Overnight and continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 117 72
Securities lending 0 2
U.S. government agencies | Up to 30 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 0 4
Securities lending 0 0
U.S. government agencies | 30-90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 96 3
Securities lending 0 0
U.S. government agencies | Over 90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 119 61
Securities lending 0 0
Other debt securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 451 823
Other debt securities | Overnight and continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 217 71
Other debt securities | Up to 30 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 72 370
Other debt securities | 30-90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 120 246
Other debt securities | Over 90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 42 136
Equity securities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 1,532 1,174
Securities lending 19,007 11,199
Equity securities | Overnight and continuous    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 0 0
Securities lending 19,007 11,199
Equity securities | Up to 30 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 42 15
Securities lending 0 0
Equity securities | 30-90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 1,014 628
Securities lending 0 0
Equity securities | Over 90 days    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchase agreements 476 531
Securities lending $ 0 $ 0