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Accumulated Other Comprehensive Income - Components of and Changes in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance $ 10,217   $ 10,028 $ 9,257   $ 5,899
Other comprehensive income (loss) before reclassifications 568 $ 27 426 1,311 $ 637 63
Amounts reclassified to (from) AOCI 35 (34) (7) 2 4 0
Deferred income tax benefit (expense) (135) 1 (89) (277) (137) (13)
Ending balance 10,981 10,217   9,982 9,257  
Total            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance 664 670 340 445 (59) (109)
Ending balance 1,132 664 670 1,481 445 (59)
Change in Net Unrealized Investment Gains (Losses)            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance 492 450 177 44 (343) (299)
Other comprehensive income (loss) before reclassifications 623 82 355 1,689 489 (56)
Amounts reclassified to (from) AOCI 35 (34) (7) 2 4 0
Deferred income tax benefit (expense) (141) (6) (75) (357) (106) 12
Ending balance 1,009 492 450 1,378 44 (343)
Change in Discount Rate for Future Policy Benefits            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance 203 256 279 287 207 105
Other comprehensive income (loss) before reclassifications (56) (57) (35) (290) 101 128
Amounts reclassified to (from) AOCI 0 0 0 0 0 0
Deferred income tax benefit (expense) 15 4 12 59 (21) (26)
Ending balance 162 203 256 56 287 207
Change in Instrument- Specific Credit Risk for Market Risk Benefits            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance (225) (147) (196) 6 (8) 1
Other comprehensive income (loss) before reclassifications 125 (104) 68 (90) 18 (11)
Amounts reclassified to (from) AOCI 0 0 0 0 0 0
Deferred income tax benefit (expense) (26) 26 (19) 19 (4) 2
Ending balance (126) (225) (147) (65) 6 (8)
Defined Benefit Pension Plan Adjustment            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance 98 100 103 104 89 85
Other comprehensive income (loss) before reclassifications (30) (3) (4) 4 19 5
Amounts reclassified to (from) AOCI 0 0 0 0 0 0
Deferred income tax benefit (expense) 6 1 1 (1) (4) (1)
Ending balance 74 98 100 107 104 89
Foreign Currency Translation / Other            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance 96 11 (23) 4 (4) (1)
Other comprehensive income (loss) before reclassifications (94) 109 42 (2) 10 (3)
Amounts reclassified to (from) AOCI 0 0 0 0 0 0
Deferred income tax benefit (expense) 11 (24) (8) 3 (2) 0
Ending balance $ 13 $ 96 $ 11 $ 5 $ 4 $ (4)