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]
Realized gain (loss)	$ 276	$ (4,934)	$ 418
Benefits	2,100	5,028	8,203
Income (loss) before taxes	2,582	(2,461)	(2,112)
Federal income tax expense (benefit)	(452)	673	437
Net investment income	5,088	5,712	5,274
Net income (loss)	2,130	(1,788)	(1,675)
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)	(182)	(4,014)	(13)
Benefits	9	589	0
Income (loss) before taxes	(173)	(3,425)	(13)
Federal income tax expense (benefit)	36	719	3
Net income (loss)	(137)	(2,706)	(10)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gain (Loss) on Derivative Instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Realized gain (loss)	8	7	39
Income (loss) before taxes	64	60	103
Federal income tax expense (benefit)	(13)	(13)	(22)
Net income (loss)	51	47	81
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