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Investments - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Net Investment Income [Line Items]
Investment revenue	$ 2,962	$ 1,915	$ 5,597	$ 3,789
Investment funds	15,868		15,868		$ 14,128
Investment expenses	(245)	(189)	(473)	(380)
Net investment income	2,717	1,726	5,124	3,409
Trading securities
Net Investment Income [Line Items]
Investment revenue	44	49	86	112
Equity securities
Net Investment Income [Line Items]
Investment revenue	25	9	40	24
Mortgage loans
Net Investment Income [Line Items]
Investment revenue	543	297	990	534
Investment funds
Net Investment Income [Line Items]
Investment expenses	29	104	72	408
Funds withheld at interest
Net Investment Income [Line Items]
Investment revenue	453	476	882	813
Other
Net Investment Income [Line Items]
Investment revenue	219	48	409	90
Available-for-sale Securities
Net Investment Income [Line Items]
Investment revenue	$ 1,649	$ 932	$ 3,118	$ 1,808

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