Investments (Net Unrealized Investment Gains (Losses)) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Components of net unrealized investment gains (losses) included in accumulated other comprehensive loss
Fixed maturity securities	$ (4,399)	$ (6,023)
Derivatives	309	344
Other	(7)	(7)
Subtotal	(4,097)	(5,686)
Amounts allocated from: Future policy benefits	532	696
Deferred income tax benefit (expense)	749	1,048
Net unrealized investment gains (losses)	$ (2,816)	$ (3,942)