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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items]
Changes in unrealized gains (losses) included in net income	$ 33	$ 1,397	$ 3,374	$ 2,513
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	7	(3)	6	(2)
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	0	12	(2)	(17)
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	2	2	(2)	(1)
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	5	(25)	14	(27)
MRBs
Fair Value Assets And Liabilities Measured On Recurring Basis Level 3 Activity [Line Items]
Changes in unrealized gains (losses) included in net income	(665)	1,415	1,357	2,783
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	661	0	1,246	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	$ 23	$ (4)	$ 755	$ (223)