Shares and Stockholders' Equity - Schedule of Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment income	$ (1,473)	$ (1,347)
Realized (gain) loss	(366)	248
Benefits	1,735	1,769
Income (loss) before taxes	145	591
Total federal income tax expense (benefit)	(52)	(152)
Net income (loss)	93	439
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gain (Loss) on Fixed Maturity AFS Securities and Certain Other Investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Realized (gain) loss	(24)	(27)
Benefits	1	7
Income (loss) before taxes	(23)	(20)
Total federal income tax expense (benefit)	5	4
Net income (loss)	(18)	(16)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gain (Loss) on Derivative Instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment income	15	15
Realized (gain) loss	1	3
Income (loss) before taxes	16	18
Total federal income tax expense (benefit)	(3)	(4)
Net income (loss)	$ 13	$ 14