Investments (Net Unrealized Investment Gains (Losses)) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Components of net unrealized investment gains (losses) included in accumulated other comprehensive loss
Fixed maturity securities	$ (4,881)	$ (7,357)
Derivatives	241	460
Other	(10)	(7)
Subtotal	(4,650)	(6,904)
Amounts allocated from: Future policy benefits	587	977
Deferred income tax benefit (expense)	853	1,245
Net unrealized investment gains (losses)	$ (3,210)	$ (4,682)