Fair Value of Financial Instruments - Changes in Unrealized Gains (Losses) Within Level 3 Financial Instruments Carried at Fair Value and Still Held (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items]
Changes in unrealized gains (losses) included in net income	$ (264)	$ 33	$ 305	$ 3,374
Trading securities
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items]
Changes in unrealized gains (losses) included in net income	3	7	3	6
Equity securities
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items]
Changes in unrealized gains (losses) included in net income	2	0	(5)	(2)
Mortgage loans on real estate
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items]
Changes in unrealized gains (losses) included in net income	(1)	2	(3)	(2)
Derivative investments
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items]
Changes in unrealized gains (losses) included in net income	34	5	(9)	14
MRBs
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items]
Changes in unrealized gains (losses) included in net income	(349)	(665)	(10)	1,357
Reinsurance-related embedded derivatives
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items]
Changes in unrealized gains (losses) included in net income	(192)	661	(267)	1,246
Indexed annuity ceded embedded derivatives
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items]
Changes in unrealized gains (losses) included in net income	$ 239	$ 23	$ 596	$ 755