Shares and Stockholders' Equity - Schedule of Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and debt expense	$ (81)	$ (83)
Net investment income	1,346	1,466
Realized gain (loss)	(434)	(828)
Benefits	(2,003)	(2,291)
Income (loss) before taxes	1,528	(1,170)
Federal income tax expense (benefit)	(306)	289
Net income (loss)	1,222	(881)
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)	(54)	(39)
Benefits	(1)	0
Income (loss) before taxes	(55)	(39)
Federal income tax expense (benefit)	12	8
Net income (loss)	(43)	(31)
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	9	6
Net investment income	15	14
Realized gain (loss)	0	2
Income (loss) before taxes	24	22
Federal income tax expense (benefit)	(5)	(5)
Net income (loss)	$ 19	$ 17