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Shareholders' Equity - OCI Components (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pretax      
Total other comprehensive income (loss) $ (170) $ 991 $ (2,467)
Income Tax Benefit (Expense)      
Total other comprehensive income (loss) 28 (211) 563
Net of Tax      
Arising during the period (157) 756 (1,985)
Reclassification to net income 15 24 81
Total other comprehensive income (loss), net of tax (142) 780 (1,904)
Net unrealized gains (losses) on securities      
Pretax      
Total other comprehensive income (loss) (264) 1,043 (3,958)
Income Tax Benefit (Expense)      
Total other comprehensive income (loss) 53 (241) 882
Net of Tax      
Arising during the period (226) 779 (3,143)
Reclassification to net income 15 23 67
Total other comprehensive income (loss), net of tax (211) 802 (3,076)
Net unrealized gains (losses) on securities arising during the period      
Pretax      
Arising during the period (303) 1,038 (4,146)
Income Tax Benefit (Expense)      
Arising during the period 61 (240) 918
Net of Tax      
Arising during the period (242) 798 (3,228)
Reclassification of net (gains) losses on securities included in net income      
Pretax      
Reclassification to net income 19 29 85
Income Tax Benefit (Expense)      
Reclassification to net income (4) (6) (18)
Net of Tax      
Reclassification to net income 15 23 67
Impact of benefit reserves and reinsurance recoverables      
Pretax      
Arising during the period 20 (24) 103
Income Tax Benefit (Expense)      
Arising during the period (4) 5 (18)
Net of Tax      
Arising during the period 16 (19) 85
Net unrealized gains (losses) on derivatives      
Pretax      
Arising during the period   3  
Reclassification to net income (1) (1) (1)
Total other comprehensive income (loss) (1) 2 (1)
Income Tax Benefit (Expense)      
Arising during the period   (1)  
Reclassification to net income 1 1 0
Total other comprehensive income (loss) 1 0 0
Net of Tax      
Arising during the period 0 2 0
Reclassification to net income 0 0 (1)
Total other comprehensive income (loss), net of tax 0 2 (1)
Effect of changes in discount rate assumptions on certain long-duration contracts      
Pretax      
Total other comprehensive income (loss) 194 (69) 1,095
Income Tax Benefit (Expense)      
Total other comprehensive income (loss) (41) 15 (234)
Net of Tax      
Arising during the period 153 (54) 861
Reclassification to net income 0 0 0
Total other comprehensive income (loss), net of tax 153 (54) 861
Effect of changes in instrument-specific credit risk on market risk benefits (“MRBs”)      
Pretax      
Total other comprehensive income (loss) (79) (83) 517
Income Tax Benefit (Expense)      
Total other comprehensive income (loss) 17 18 (110)
Net of Tax      
Arising during the period (62) (65) 407
Reclassification to net income 0 0 0
Total other comprehensive income (loss), net of tax (62) (65) 407
Defined benefit plans      
Pretax      
Total other comprehensive income (loss) 17 19 96
Income Tax Benefit (Expense)      
Total other comprehensive income (loss) (2) (4) (20)
Net of Tax      
Arising during the period 15 14 61
Reclassification to net income 0 1 15
Total other comprehensive income (loss), net of tax 15 15 76
Prior service credits (costs)      
Pretax      
Total other comprehensive income (loss) (2) (1) (1)
Income Tax Benefit (Expense)      
Total other comprehensive income (loss) 1 0 0
Net of Tax      
Total other comprehensive income (loss), net of tax (1) (1) (1)
Net gains (losses)      
Pretax      
Total other comprehensive income (loss) 19 20 97
Income Tax Benefit (Expense)      
Total other comprehensive income (loss) (3) (4) (20)
Net of Tax      
Total other comprehensive income (loss), net of tax 16 16 77
Foreign currency translation      
Pretax      
Total other comprehensive income (loss) (37) 79 (216)
Income Tax Benefit (Expense)      
Total other comprehensive income (loss) 0 1 45
Net of Tax      
Arising during the period (37) 80 (171)
Reclassification to net income 0 0 0
Total other comprehensive income (loss), net of tax $ (37) $ 80 $ (171)