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
	Mar. 31, 2024	Mar. 31, 2023
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items]
Changes in unrealized gains (losses) included in net income	$ 2,356	$ (801)
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	0	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	(3)	(16)
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	0	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	16	(2)
MRBs
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items]
Changes in unrealized gains (losses) included in net income	1,896	(638)
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	206	0
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	$ 241	$ (153)