Investments (Changes in Net Unrealized Investment Gains (Losses)) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
Investments, Debt and Equity Securities [Abstract]
Unrealized investment gains (losses), beginning of period	$ (4,682)
Unrealized investment gains (losses) during the period	2,254
Unrealized investment gains (losses) relating to: Future policy benefits	(390)
Unrealized investment gains (losses) relating to: Deferred income tax benefit (expense)	(392)
Unrealized investment gains (losses), end of period	(3,210)
Change in net unrealized investment gains (losses)	$ 1,472