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Shareholders' Equity - Changes in AOCI Components (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Changes in balances of each component of AOCI, net of tax        
Beginning balance $ 6,082 $ 4,993 $ 5,228 $ 4,729
OCI before reclassifications 276 892 940 663
Amounts reclassified from AOCI (9) 0 (1) 2
Total other comprehensive income (loss), net of tax 267 892 939 665
Ending balance 6,455 5,715 6,455 5,715
Total AOCI        
Changes in balances of each component of AOCI, net of tax        
Beginning balance (1,236) (1,993) (1,908) (1,766)
Total other comprehensive income (loss), net of tax 267 892 939 665
Ending balance (969) (1,101) (969) (1,101)
Net unrealized gains (losses) on securities        
Changes in balances of each component of AOCI, net of tax        
Beginning balance (886) (1,554) (1,452) (1,241)
OCI before reclassifications 366 1,005 924 690
Amounts reclassified from AOCI (9) 0 (1) 2
Total other comprehensive income (loss), net of tax 357 1,005 923 692
Ending balance (529) (549) (529) (549)
Net unrealized gains (losses) on derivatives        
Changes in balances of each component of AOCI, net of tax        
Beginning balance (4) 5 5 5
OCI before reclassifications 0 0 (9) 0
Amounts reclassified from AOCI 0 0 0 0
Total other comprehensive income (loss), net of tax 0 0 (9) 0
Ending balance (4) 5 (4) 5
Effect of changes in discount rate assumptions on certain long-duration contracts        
Changes in balances of each component of AOCI, net of tax        
Beginning balance (15) 5 27 (126)
OCI before reclassifications (46) (147) (88) (16)
Amounts reclassified from AOCI 0 0 0 0
Total other comprehensive income (loss), net of tax (46) (147) (88) (16)
Ending balance (61) (142) (61) (142)
Effect of changes in instrument-specific credit risk on MRBs        
Changes in balances of each component of AOCI, net of tax        
Beginning balance (145) (113) (147) (85)
OCI before reclassifications (10) (49) (8) (77)
Amounts reclassified from AOCI 0 0 0 0
Total other comprehensive income (loss), net of tax (10) (49) (8) (77)
Ending balance (155) (162) (155) (162)
Defined benefit plans        
Changes in balances of each component of AOCI, net of tax        
Beginning balance (45) (60) (45) (60)
OCI before reclassifications 0 0 0 0
Amounts reclassified from AOCI 0 0 0 0
Total other comprehensive income (loss), net of tax 0 0 0 0
Ending balance (45) (60) (45) (60)
Foreign currency translation        
Changes in balances of each component of AOCI, net of tax        
Beginning balance (140) (275) (295) (258)
OCI before reclassifications (34) 83 121 66
Amounts reclassified from AOCI 0 0 0 0
Total other comprehensive income (loss), net of tax (34) 83 121 66
Ending balance (174) (192) (174) (192)
Other        
Changes in balances of each component of AOCI, net of tax        
Beginning balance (1) (1) (1) (1)
OCI before reclassifications 0 0 0 0
Amounts reclassified from AOCI 0 0 0 0
Total other comprehensive income (loss), net of tax 0 0 0 0
Ending balance $ (1) $ (1) $ (1) $ (1)