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Accumulated Other Comprehensive Income - Components of and Changes in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance $ 10,045 $ 10,028 $ 6,067 $ 5,899
Other comprehensive income (loss) before reclassifications 27 426 637 63
Amounts reclassified to (from) AOCI (34) (7) 4 0
Deferred income tax benefit (expense) 1 (89) (137) (13)
Ending balance 10,217 10,045 9,257 6,067
Total        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 670 340 (59) (109)
Ending balance 664 670 445 (59)
Change in Net Unrealized Investment Gains (Losses)        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 450 177 (343) (299)
Other comprehensive income (loss) before reclassifications 82 355 489 (56)
Amounts reclassified to (from) AOCI (34) (7) 4 0
Deferred income tax benefit (expense) (6) (75) (106) 12
Ending balance 492 450 44 (343)
Change in Discount Rate for Future Policy Benefits        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 256 279 207 105
Other comprehensive income (loss) before reclassifications (57) (35) 101 128
Amounts reclassified to (from) AOCI 0 0 0 0
Deferred income tax benefit (expense) 4 12 (21) (26)
Ending balance 203 256 287 207
Change in Instrument- Specific Credit Risk for Market Risk Benefits        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (147) (196) (8) 1
Other comprehensive income (loss) before reclassifications (104) 68 18 (11)
Amounts reclassified to (from) AOCI 0 0 0 0
Deferred income tax benefit (expense) 26 (19) (4) 2
Ending balance (225) (147) 6 (8)
Defined Benefit Pension Plan Adjustment        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 100 103 89 85
Other comprehensive income (loss) before reclassifications (3) (4) 19 5
Amounts reclassified to (from) AOCI 0 0 0 0
Deferred income tax benefit (expense) 1 1 (4) (1)
Ending balance 98 100 104 89
Foreign Currency Translation / Other        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 11 (23) (4) (1)
Other comprehensive income (loss) before reclassifications 109 42 10 (3)
Amounts reclassified to (from) AOCI 0 0 0 0
Deferred income tax benefit (expense) (24) (8) (2) 0
Ending balance $ 96 $ 11 $ 4 $ (4)