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Investments - Schedule of Net Investment Income (Details) - Retirement Services - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Investment Income [Line Items]
Investment revenue	$ 12,171	$ 8,186
Investment expenses	(91)	(38)
Net investment income	12,080	8,148	$ 0
AFS securities
Net Investment Income [Line Items]
Investment revenue	6,901	4,165
Trading securities
Net Investment Income [Line Items]
Investment revenue	177	174
Equity securities
Net Investment Income [Line Items]
Investment revenue	76	64
Mortgage loans
Net Investment Income [Line Items]
Investment revenue	2,360	1,261
Investment funds
Net Investment Income [Line Items]
Investment revenue	90	408
Funds withheld at interest
Net Investment Income [Line Items]
Investment revenue	1,752	1,844
Other
Net Investment Income [Line Items]
Investment revenue	$ 815	$ 270