v3.26.3
Fair Value Measurements - Changes in level 3 recurring fair value measurements, assets (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value Beginning of Year $ 23,565 $ 32,518 $ 33,640 $ 32,202  
Net Realized and Unrealized Gains (Losses) Included in Income 4 (18) (8) 391  
Other Comprehensive Income (Loss) (512) 171 (798) 618  
Purchases, Sales, Issuances and Settlements, Net 517 (180) 1,059 673  
Gross Transfers In 2,248 1,014 4,212 2,183  
Gross Transfers Out (1,082) (751) (13,362) (3,313)  
Other 0 0 (3) 0  
Fair Value End of Period 24,740 32,754 $ 24,740 $ 32,754  
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]     Total net realized gains (losses) Total net realized gains (losses)  
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]     Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Net of Tax  
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period (40) (1) $ (83) $ 36  
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period (454) 146 $ (747) $ 442  
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]     Total net realized gains (losses) Total net realized gains (losses)  
Market risk benefit assets, at fair value 2,348   $ 2,348   $ 2,392
Level 3          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Market risk benefit assets, at fair value 2,348 2,500 2,348 $ 2,500 $ 2,392
Bonds available-for-sale          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value Beginning of Year 20,630 29,465 30,533 28,973  
Net Realized and Unrealized Gains (Losses) Included in Income 36 (22) 70 350  
Other Comprehensive Income (Loss) (509) 178 (782) 572  
Purchases, Sales, Issuances and Settlements, Net 513 (49) 1,165 836  
Gross Transfers In 2,171 812 3,731 1,974  
Gross Transfers Out (1,037) (744) (12,910) (3,065)  
Other 0 0 (3) 0  
Fair Value End of Period 21,804 29,640 21,804 29,640  
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 0 0 0 0  
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period (454) 146 (747) 442  
Bonds available-for-sale | Obligations of states, municipalities and political subdivisions          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value Beginning of Year 747 761 761 745  
Net Realized and Unrealized Gains (Losses) Included in Income 0 (2) (3) (3)  
Other Comprehensive Income (Loss) (68) 18 (69) 15  
Purchases, Sales, Issuances and Settlements, Net 0 0 (10) (4)  
Gross Transfers In 0 1 0 25  
Gross Transfers Out (2) 0 (2) 0  
Other 0 0 0 0  
Fair Value End of Period 677 778 677 778  
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 0 0 0 0  
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period (68) 8 (76) (3)  
Bonds available-for-sale | Corporate debt          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value Beginning of Year 818 433 681 1,834  
Net Realized and Unrealized Gains (Losses) Included in Income 1 (31) (10) (36)  
Other Comprehensive Income (Loss) (13) (15) (27) 19  
Purchases, Sales, Issuances and Settlements, Net 49 59 4 129  
Gross Transfers In 154 147 750 484  
Gross Transfers Out (96) (173) (485) (2,010)  
Other (26) 0 (26) 0  
Fair Value End of Period 887 420 887 420  
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 0 0 0 0  
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period (16) (16) (32) (7)  
Bonds available-for-sale | RMBS          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value Beginning of Year 2,993 5,988 5,855 6,045  
Net Realized and Unrealized Gains (Losses) Included in Income 42 26 75 149  
Other Comprehensive Income (Loss) (182) 22 (222) 86  
Purchases, Sales, Issuances and Settlements, Net 240 (80) 246 (229)  
Gross Transfers In 457 0 521 80  
Gross Transfers Out (361) (2) (3,286) (177)  
Other 0 0 0 0  
Fair Value End of Period 3,189 5,954 3,189 5,954  
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 0 0 0 0  
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period (147) 22 (185) 94  
Bonds available-for-sale | CMBS          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value Beginning of Year 490 792 744 621  
Net Realized and Unrealized Gains (Losses) Included in Income 5 9 12 19  
Other Comprehensive Income (Loss) (27) 11 (15) 33  
Purchases, Sales, Issuances and Settlements, Net (10) (114) (87) (134)  
Gross Transfers In 191 64 208 223  
Gross Transfers Out (26) 0 (239) 0  
Other 0 0 0 0  
Fair Value End of Period 623 762 623 762  
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 0 0 0 0  
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period (26) 16 (19) 35  
Bonds available-for-sale | CLO          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value Beginning of Year 2,239 1,987 2,055 2,162  
Net Realized and Unrealized Gains (Losses) Included in Income 0 4 (1) 20  
Other Comprehensive Income (Loss) (2) (13) (33) (8)  
Purchases, Sales, Issuances and Settlements, Net 25 228 390 290  
Gross Transfers In 0 5 15 7  
Gross Transfers Out (193) (100) (357) (360)  
Other 0 0 0 0  
Fair Value End of Period 2,069 2,111 2,069 2,111  
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 0 0 0 0  
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period (1) (14) (32) (8)  
Bonds available-for-sale | ABS          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value Beginning of Year 13,343 19,504 20,437 17,566  
Net Realized and Unrealized Gains (Losses) Included in Income (12) (28) (3) 201  
Other Comprehensive Income (Loss) (217) 155 (416) 427  
Purchases, Sales, Issuances and Settlements, Net 209 (142) 622 784  
Gross Transfers In 1,369 595 2,237 1,155  
Gross Transfers Out (359) (469) (8,541) (518)  
Other 26 0 23 0  
Fair Value End of Period 14,359 19,615 14,359 19,615  
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 0 0 0 0  
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period (196) 130 (403) 331  
Other bond securities          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value Beginning of Year 1,421 1,350 1,540 1,541  
Net Realized and Unrealized Gains (Losses) Included in Income (37) 13 (63) 41  
Other Comprehensive Income (Loss) 0 0 0 0  
Purchases, Sales, Issuances and Settlements, Net 104 (25) 14 (50)  
Gross Transfers In 77 194 481 201  
Gross Transfers Out (45) (7) (452) (208)  
Other 0 0 0 0  
Fair Value End of Period 1,520 1,525 1,520 1,525  
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period (40) 8 (63) 20  
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0 0 0 0  
Other bond securities | Obligations of states, municipalities and political subdivisions          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value Beginning of Year 1 1 1 1  
Net Realized and Unrealized Gains (Losses) Included in Income 0 0 0 0  
Other Comprehensive Income (Loss) 0 0 0 0  
Purchases, Sales, Issuances and Settlements, Net 0 0 0 0  
Gross Transfers In 0 0 0 0  
Gross Transfers Out 0 0 0 0  
Other 0 0 0 0  
Fair Value End of Period 1 1 1 1  
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 0 0 0 0  
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0 0 0 0  
Other bond securities | Corporate debt          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value Beginning of Year 607 13 205 209  
Net Realized and Unrealized Gains (Losses) Included in Income (8) 0 (15) (2)  
Other Comprehensive Income (Loss) 0 0 0 0  
Purchases, Sales, Issuances and Settlements, Net (13) 0 (7) (14)  
Gross Transfers In 0 192 403 199  
Gross Transfers Out 0 0 0 (187)  
Other (9) 0 (9) 0  
Fair Value End of Period 577 205 577 205  
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period (7) 0 (11) (2)  
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0 0 0 0  
Other bond securities | RMBS          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value Beginning of Year 41 88 87 98  
Net Realized and Unrealized Gains (Losses) Included in Income (2) 2 (1) 5  
Other Comprehensive Income (Loss) 0 0 0 0  
Purchases, Sales, Issuances and Settlements, Net 0 (2) 1 (7)  
Gross Transfers In 7 0 7 0  
Gross Transfers Out (2) 0 (50) (8)  
Other 0 0 0 0  
Fair Value End of Period 44 88 44 88  
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period (2) 2 1 5  
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0 0 0 0  
Other bond securities | CMBS          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value Beginning of Year 7 16 16 14  
Net Realized and Unrealized Gains (Losses) Included in Income 0 0 1 2  
Other Comprehensive Income (Loss) 0 0 0 0  
Purchases, Sales, Issuances and Settlements, Net 0 0 (10) 0  
Gross Transfers In 0 0 0 0  
Gross Transfers Out 0 0 0 0  
Other 0 0 0 0  
Fair Value End of Period 7 16 7 16  
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period (1) 0 (1) 2  
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0 0 0 0  
Other bond securities | CLO          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value Beginning of Year 31 57 43 59  
Net Realized and Unrealized Gains (Losses) Included in Income (2) (1) (14) (1)  
Other Comprehensive Income (Loss) 0 0 0 0  
Purchases, Sales, Issuances and Settlements, Net 9 3 9 7  
Gross Transfers In 0 0 1 0  
Gross Transfers Out 0 (7) (1) (13)  
Other 0 0 0 0  
Fair Value End of Period 38 52 38 52  
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period (4) (5) (16) (5)  
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0 0 0 0  
Other bond securities | ABS          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value Beginning of Year 734 1,175 1,188 1,160  
Net Realized and Unrealized Gains (Losses) Included in Income (25) 12 (34) 37  
Other Comprehensive Income (Loss) 0 0 0 0  
Purchases, Sales, Issuances and Settlements, Net 108 (26) 21 (36)  
Gross Transfers In 70 2 70 2  
Gross Transfers Out (43) 0 (401) 0  
Other 9 0 9 0  
Fair Value End of Period 853 1,163 853 1,163  
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period (26) 11 (36) 20  
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0 0 0 0  
Equity securities          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value Beginning of Year 42 41 69 41  
Net Realized and Unrealized Gains (Losses) Included in Income 0 11 (21) 11  
Other Comprehensive Income (Loss) 0 0 0 0  
Purchases, Sales, Issuances and Settlements, Net 0 1 (6) 1  
Gross Transfers In 0 8 0 8  
Gross Transfers Out 0 0 0 0  
Other 0 0 0 0  
Fair Value End of Period 42 61 42 61  
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 0 11 (19) 11  
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period 0 0 0 0  
Other invested assets          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value Beginning of Year 1,472 1,662 1,498 1,647  
Net Realized and Unrealized Gains (Losses) Included in Income 5 (20) 6 (11)  
Other Comprehensive Income (Loss) (3) (7) (16) 46  
Purchases, Sales, Issuances and Settlements, Net (100) (107) (114) (114)  
Gross Transfers In 0 0 0 0  
Gross Transfers Out 0 0 0 (40)  
Other 0 0 0 0  
Fair Value End of Period 1,374 1,528 1,374 1,528  
Changes in Unrealized Gains (Losses) Included in Income on Instruments Held at End of Period 0 (20) (1) 5  
Changes in Unrealized Gains (Losses) Included in Other Comprehensive Income (Loss) for Recurring Level 3 Instruments Held at End of Period $ 0 $ 0 $ 0 $ 0