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Shareholders' Equity - Changes in AOCI Components (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Changes in balances of each component of AOCI, net of tax    
Beginning balance $ 5,228 $ 4,729
OCI before reclassifications 393 (164)
Amounts reclassified from AOCI (4)  
Total other comprehensive income (loss), net of tax 389 (164)
Ending balance 5,426 4,879
Total AOCI    
Changes in balances of each component of AOCI, net of tax    
Beginning balance (1,908) (1,766)
Total other comprehensive income (loss), net of tax 389 (164)
Ending balance (1,519) (1,930)
Net unrealized gains (losses) on securities    
Changes in balances of each component of AOCI, net of tax    
Beginning balance (1,452) (1,241)
OCI before reclassifications 378 (178)
Amounts reclassified from AOCI (4)  
Total other comprehensive income (loss), net of tax 374 (178)
Ending balance (1,078) (1,419)
Net unrealized gains (losses) on derivatives    
Changes in balances of each component of AOCI, net of tax    
Beginning balance 5 5
OCI before reclassifications (8) 0
Amounts reclassified from AOCI 0  
Total other comprehensive income (loss), net of tax (8) 0
Ending balance (3) 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 27 (126)
OCI before reclassifications (30) 69
Amounts reclassified from AOCI 0  
Total other comprehensive income (loss), net of tax (30) 69
Ending balance (3) (57)
Effect of changes in instrument-specific credit risk on MRBs    
Changes in balances of each component of AOCI, net of tax    
Beginning balance (147) (85)
OCI before reclassifications 1 (37)
Amounts reclassified from AOCI 0  
Total other comprehensive income (loss), net of tax 1 (37)
Ending balance (146) (122)
Defined benefit plans    
Changes in balances of each component of AOCI, net of tax    
Beginning balance (45) (60)
OCI before reclassifications 0 0
Amounts reclassified from AOCI 0  
Total other comprehensive income (loss), net of tax 0 0
Ending balance (45) (60)
Foreign currency translation    
Changes in balances of each component of AOCI, net of tax    
Beginning balance (295) (258)
OCI before reclassifications 52 (18)
Amounts reclassified from AOCI 0  
Total other comprehensive income (loss), net of tax 52 (18)
Ending balance (243) (276)
Other    
Changes in balances of each component of AOCI, net of tax    
Beginning balance (1) (1)
OCI before reclassifications 0 0
Amounts reclassified from AOCI 0  
Total other comprehensive income (loss), net of tax 0 0
Ending balance $ (1) $ (1)