Investments (Net Investment Income - Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Investment Income [Line Items]
Net investment income	$ 4,064	$ 4,815	$ 3,528
Net investment gains (losses)	(240)	(63)	279
Other limited partnership interests
Net Investment Income [Line Items]
Net investment income	170	1,300	225
Foreign Exchange
Net Investment Income [Line Items]
Net investment gains (losses)	$ (18)	$ 0	$ 7