Shares and Stockholders' Equity - Schedule of Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment income	$ 5,525	$ 5,879	$ 5,515
Interest and debt expense	(336)	(331)	(283)
Realized gain (loss)	269	(4,311)	840
Benefits	(7,918)	(6,138)	(8,479)
Income (loss) before taxes	4,022	(1,148)	1,725
Federal income tax expense (benefit)	(747)	396	(367)
Net income (loss)	3,275	(752)	1,358
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)	(244)	(869)	(15)
Benefits	39	9	0
Income (loss) before taxes	(205)	(860)	(15)
Federal income tax expense (benefit)	43	181	3
Net income (loss)	(162)	(679)	(12)
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	25	31	(11)
Realized gain (loss)	8	7	39
Income (loss) before taxes	89	91	92
Federal income tax expense (benefit)	(19)	(19)	(19)
Net income (loss)	70	72	73
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gain (Loss) on Derivative Instruments | Interest rate contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment income	(3)	(1)	2
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gain (Loss) on Derivative Instruments | Foreign currency contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment income	$ 59	$ 54	$ 62