Investments (Net Unrealized Investment Gains (Losses)) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Components of net unrealized investment gains (losses) included in accumulated other comprehensive loss
Fixed maturity securities	$ (6,023)	$ (8,632)	$ 8,251
Derivatives	344	628	320
Other	(7)	(7)	(27)
Subtotal	(5,686)	(8,011)	8,544
Amounts allocated from: Future policy benefits	696	992	(1,925)
Deferred income tax benefit (expense)	1,048	1,474	(1,390)
Net unrealized investment gains (losses)	$ (3,942)	$ (5,545)	$ 5,229