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Accumulated Other Comprehensive Income - Components of and Changes in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 5 Months Ended 7 Months Ended 12 Months Ended
May 24, 2022
Dec. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance $ 7,002 $ 3,623 $ 5,899 $ 3,755
Other comprehensive income (loss) before reclassifications (613) (467) 569 248
Amounts reclassified to (from) AOCI (3) 19 13 182
Deferred income tax benefit (expense)     (133) (91)
Ending balance 6,496 3,755 10,028 5,899
AOCI Including Portion Attributable to Noncontrolling Interest        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 147 0 (109) (448)
Ending balance (469) (448) 340 (109)
Change in Net Unrealized Investment Gains (Losses)        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 149 0 (299) (722)
Other comprehensive income (loss) before reclassifications (613) (740) 605 461
Amounts reclassified to (from) AOCI (7) 18 13 75
Deferred income tax benefit (expense)     (142) (113)
Ending balance (471) (722) 177 (299)
Change in Discount Rate for Future Policy Benefits        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance   0 105 253
Other comprehensive income (loss) before reclassifications   253 221 (188)
Amounts reclassified to (from) AOCI   0 0 0
Deferred income tax benefit (expense)     (47) 40
Ending balance   253 279 105
Change in Instrument- Specific Credit Risk for Market Risk Benefit        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance   0 1 21
Other comprehensive income (loss) before reclassifications   21 (249) (25)
Amounts reclassified to (from) AOCI   0 0 0
Deferred income tax benefit (expense)     52 5
Ending balance   21 (196) 1
Defined Benefit Pension Plan Adjustment        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 1 0 85 1
Other comprehensive income (loss) before reclassifications 0 0 23 0
Amounts reclassified to (from) AOCI 4 1 0 107
Deferred income tax benefit (expense)     (5) (23)
Ending balance 5 1 103 85
Foreign Currency Translation / Other        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (3) 0 (1) (1)
Other comprehensive income (loss) before reclassifications 0 (1) (31) 0
Amounts reclassified to (from) AOCI 0 0 0 0
Deferred income tax benefit (expense)     9 0
Ending balance $ (3) $ (1) $ (23) $ (1)