Shares and Stockholders’ Equity - Schedule of Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net investment income	$ 1,544	$ 1,416	$ 4,478	$ 4,104
Interest and debt expense	(79)	(86)	(146)	(253)
Realized gain (loss)	(216)	(431)	(847)	(201)
Benefits	(1,926)	(1,937)	(5,988)	(5,948)
Income (loss) before taxes	524	(703)	423	1,922
Federal income tax expense (benefit)	(79)	175	0	(334)
Net income (loss)	$ 445	$ (528)	423	1,588
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)			(173)	(193)
Benefits			34	30
Income (loss) before taxes			(139)	(163)
Federal income tax expense (benefit)			29	34
Net income (loss)			(110)	(129)
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			10	20
Realized gain (loss)			2	1
Income (loss) before taxes			54	60
Federal income tax expense (benefit)			(11)	(13)
Net income (loss)			43	47
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			0	(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			$ 42	$ 41