Investments (Net Investment Income - Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net Investment Income [Line Items]
Debt and Equity Securities, Realized Gain (Loss)	$ 1,200	$ 1,100	$ 1,300
Equity Securities, FV-NI, Unrealized Gain (Loss)	177	(153)	84
Income (Loss) from Equity Method Investments	5,100	829	795
Net investment income
Net Investment Income [Line Items]
Debt and Equity Securities, Gain (Loss)	1,100	655	1,500
Debt and Equity Securities, Realized Gain (Loss)	518	422	467
Debt and Equity Securities, Unrealized Gain (Loss)	616	233	1,000
Unit-linked investments
Net Investment Income [Line Items]
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 730	$ 489	$ 1,000