Investments (Changes in Net Unrealized Investment Gains (Losses)) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Investments, Debt and Equity Securities [Abstract]
Unrealized investment gains (losses), beginning of period	$ (3,942)
Unrealized investment gains (losses) during the period	(875)
Unrealized investment gains (losses) relating to: Future policy benefits	171
Unrealized investment gains (losses) relating to: Deferred income tax benefit (expense)	148
Unrealized investment gains (losses), end of period	(4,498)
Change in net unrealized investment gains (losses)	$ (556)