Shares and Stockholders' Equity - Schedule of Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and debt expense	$ (80)	$ (81)
Net investment income	1,457	1,346
Realized gain (loss)	11	(434)
Benefits	(2,068)	(2,003)
Income (loss) before taxes	(949)	1,528
Federal income tax expense (benefit)	227	(306)
Net income (loss)	(722)	1,222
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gain (Loss) on Fixed Maturity AFS Securities and Certain
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Realized gain (loss)	(118)	(54)
Benefits	28	(1)
Income (loss) before taxes	(90)	(55)
Federal income tax expense (benefit)	19	12
Net income (loss)	(71)	(43)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gain (Loss) on Derivative Instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and debt expense	3	9
Net investment income	15	15
Realized gain (loss)	3	0
Income (loss) before taxes	21	24
Federal income tax expense (benefit)	(4)	(5)
Net income (loss)	$ 17	$ 19