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Investments - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Net Investment Income [Line Items]
Investment revenue	$ 2,635	$ 1,874
Investment funds	14,552		$ 14,128
Investment expenses	(228)	(191)
Net investment income	2,407	1,683
Trading securities
Net Investment Income [Line Items]
Investment revenue	42	63
Equity securities
Net Investment Income [Line Items]
Investment revenue	15	15
Mortgage loans
Net Investment Income [Line Items]
Investment revenue	447	237
Investment funds
Net Investment Income [Line Items]
Investment expenses	43	304
Funds withheld at interest
Net Investment Income [Line Items]
Investment revenue	429	337
Other
Net Investment Income [Line Items]
Investment revenue	190	42
Available-for-sale Securities
Net Investment Income [Line Items]
Investment revenue	$ 1,469	$ 876