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	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value Assets and Liabilities Measured on Recurring Basis Level 3 Activity [Line Items]
Changes in unrealized gains (losses) included in net income	$ 1,030	$ (605)	$ 2,681
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Realized gain (loss)	Realized gain (loss)	Realized gain (loss)
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	$ 8	$ (81)	$ 4
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	(16)	54	40
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	(8)	(20)	12
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	1	2	1,051
MRBs
Fair Value Assets and Liabilities Measured on Recurring Basis Level 3 Activity [Line Items]
Changes in unrealized gains (losses) included in net income	1,071	(359)	1,530
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	(20)	(95)	44
Other assets – LPR ceded derivative
Fair Value Assets and Liabilities Measured on Recurring Basis Level 3 Activity [Line Items]
Changes in unrealized gains (losses) included in net income	$ (6)	$ (106)	$ 0