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Shareholder's Equity - Changes in AOCI Components (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Changes in balances of each component of AOCI, net of tax      
Beginning balance $ 4,729 $ 3,803 $ 4,837
OCI before reclassifications (157) 756 (1,985)
Amounts reclassified from AOCI 15 24 81
Total other comprehensive income (loss), net of tax (142) 780 (1,904)
Ending balance 5,228 4,729 3,803
Total AOCI      
Changes in balances of each component of AOCI, net of tax      
Beginning balance (1,766) (2,546) (642)
Total other comprehensive income (loss), net of tax (142) 780 (1,904)
Ending balance (1,908) (1,766) (2,546)
Net Unrealized Gains (Losses) on Securities      
Changes in balances of each component of AOCI, net of tax      
Beginning balance (1,241) (2,043) 1,033
OCI before reclassifications (226) 779 (3,143)
Amounts reclassified from AOCI 15 23 67
Total other comprehensive income (loss), net of tax (211) 802 (3,076)
Ending balance (1,452) (1,241) (2,043)
Net Unrealized Gains (Losses) on Derivatives      
Changes in balances of each component of AOCI, net of tax      
Beginning balance 5 3 4
OCI before reclassifications 0 2 0
Amounts reclassified from AOCI 0 0 (1)
Total other comprehensive income (loss), net of tax 0 2 (1)
Ending balance 5 5 3
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 (126) (72) (933)
OCI before reclassifications 153 (54) 861
Amounts reclassified from AOCI 0 0 0
Total other comprehensive income (loss), net of tax 153 (54) 861
Ending balance 27 (126) (72)
Effect of changes in instrument-specific credit risk on market risk benefits (“MRBs”)      
Changes in balances of each component of AOCI, net of tax      
Beginning balance (85) (20) (427)
OCI before reclassifications (62) (65) 407
Amounts reclassified from AOCI 0 0 0
Total other comprehensive income (loss), net of tax (62) (65) 407
Ending balance (147) (85) (20)
Defined Benefit Plans      
Changes in balances of each component of AOCI, net of tax      
Beginning balance (60) (75) (151)
OCI before reclassifications 15 14 61
Amounts reclassified from AOCI 0 1 15
Total other comprehensive income (loss), net of tax 15 15 76
Ending balance (45) (60) (75)
Foreign Currency Translation      
Changes in balances of each component of AOCI, net of tax      
Beginning balance (258) (338) (167)
OCI before reclassifications (37) 80 (171)
Amounts reclassified from AOCI 0 0 0
Total other comprehensive income (loss), net of tax (37) 80 (171)
Ending balance (295) (258) (338)
Other      
Changes in balances of each component of AOCI, net of tax      
Beginning balance (1) (1) (1)
OCI before reclassifications 0 0 0
Amounts reclassified from AOCI 0 0 0
Total other comprehensive income (loss), net of tax 0 0 0
Ending balance $ (1) $ (1) $ (1)