Investments (Changes in Net Unrealized Investment Gains (Losses)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Unrealized investment gains (losses), beginning of year	$ 5,429	$ 3,229	$ 744
Unrealized investment gains (losses) during the year	(3,420)	4,853	5,194
Unrealized investment gains (losses) relating to: Future policy benefits	1,388	(1,907)	(1,806)
Unrealized investment gains (losses) relating to: DAC, VOBA and DSI	107	(162)	(242)
Unrealized investment gains (losses) relating to: Deferred income tax benefit (expense)	404	(584)	(661)
Unrealized investment gains (losses), end of year	3,908	5,429	3,229
Change in net unrealized investment gains (losses)	$ (1,521)	$ 2,200	$ 2,485