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		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 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	$ 1,148	$ 722	$ (82)	$ 3,077
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	(1)	0	(1)
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	(1)	(1)	(7)	(3)
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)	(2)	(3)
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	(6)	(8)	(6)	8
MRBs
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items]
Changes in unrealized gains (losses) included in net income	933	127	(367)	2,022
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	14	228	(75)	469
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	$ 206	$ 379	$ 375	$ 585