Investments (Changes in Net Unrealized Investment Gains (Losses)) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)
Investments, Debt and Equity Securities [Abstract]
Unrealized investment gains (losses), beginning of period	$ (5,545)
Unrealized investment gains (losses) during the period	(2,253)
Unrealized investment gains (losses) relating to: Future policy benefits	420
Unrealized investment gains (losses) relating to: Deferred income tax benefit (expense)	385
Unrealized investment gains (losses), end of period	(6,993)
Change in net unrealized investment gains (losses)	$ (1,448)