Investments (Changes in Net Unrealized Investment Gains (Losses)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Unrealized investment gains (losses), beginning of year	$ (3,942)	$ (5,545)	$ 5,229
Unrealized investment gains (losses) during the year	(1,218)	2,325	(16,555)
Unrealized investment gains (losses) relating to: Future policy benefits	281	(296)	2,917
Unrealized investment gains (losses) relating to: Deferred income tax benefit (expense)	197	(426)	2,864
Unrealized investment gains (losses), end of year	(4,682)	(3,942)	(5,545)
Change in net unrealized investment gains (losses)	$ (740)	$ 1,603	$ (10,774)