Investments (Net Unrealized Investment Gains (Losses)) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Components of net unrealized investment gains (losses) included in accumulated other comprehensive loss
Fixed maturity securities	$ (7,357)	$ (6,023)	$ (8,632)
Derivatives	460	344	628
Other	(7)	(7)	(7)
Subtotal	(6,904)	(5,686)	(8,011)
Amounts allocated from: Future policy benefits	977	696	992
Deferred income tax benefit (expense)	1,245	1,048	1,474
Net unrealized investment gains (losses)	$ (4,682)	$ (3,942)	$ (5,545)