Investments (Net Unrealized Investment Gains (Losses)) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Components of net unrealized investment gains (losses) included in accumulated other comprehensive loss
Fixed maturity securities	$ (6,275)	$ (7,357)
Derivatives	437	460
Other	(7)	(7)
Subtotal	(5,845)	(6,904)
Amounts allocated from: Future policy benefits	836	977
Deferred income tax benefit (expense)	1,052	1,245
Net unrealized investment gains (losses)	$ (3,957)	$ (4,682)