Investments (Net Unrealized Investment Gains (Losses)) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Fixed maturity securities	$ 8,251	$ 11,818	$ 6,894
Derivatives	320	162	232
Other	(27)	(16)	(15)
Subtotal	8,544	11,964	7,111
Amounts allocated from: Future policy benefits	(3,210)	(4,598)	(2,691)
Amounts allocated from: DAC, VOBA and DSI	(387)	(494)	(332)
Subtotal	(3,597)	(5,092)	(3,023)
Deferred income tax benefit (expense)	(1,039)	(1,443)	(859)
Net unrealized investment gains (losses)	$ 3,908	$ 5,429	$ 3,229