Investments (Changes in Net Unrealized Investment Gains (Losses)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Unrealized investment gains (losses), beginning of year	$ 4,220	$ 5,761	$ 3,283
Unrealized investment gains (losses) during the year	(16,766)	(3,478)	4,936
Unrealized investment gains (losses) relating to: Future policy benefits	3,819	1,410	(1,621)
Unrealized investment gains (losses) relating to: DAC, VOBA and DSI	813	117	(179)
Unrealized investment gains (losses) relating to: Deferred income tax benefit (expense)	2,548	410	(658)
Unrealized investment gains (losses), end of year	(5,366)	4,220	5,761
Change in net unrealized investment gains (losses)	$ (9,586)	$ (1,541)	$ 2,478