Shares and Stockholders' Equity - Schedule of Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment income	$ 5,879	$ 5,515	$ 6,111
Interest and debt expense	(331)	(283)	(270)
Realized gain (loss)	(4,311)	840	(867)
Benefits	6,138	8,479	8,503
Income (loss) before taxes	(1,148)	1,725	4,643
Federal income tax expense (benefit)	396	(367)	(865)
Net income (loss)	(752)	1,358	3,778
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)	(869)	(15)	626
Benefits	9
Income (loss) before taxes	(860)	(15)	626
Federal income tax expense (benefit)	181	3	(131)
Net income (loss)	(679)	(12)	495
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	31	(11)	(23)
Realized gain (loss)	7	39	(2)
Income (loss) before taxes	91	92	26
Federal income tax expense (benefit)	(19)	(19)	(5)
Net income (loss)	72	73	21
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	(1)	2	3
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	$ 54	$ 62	$ 48