Investments (Net Unrealized Investment Gains (Losses)) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Components of net unrealized investment gains (losses) included in accumulated other comprehensive loss
Fixed maturity securities	$ (6,895)	$ (8,632)
Derivatives	588	628
Other	(6)	(7)
Subtotal	(6,313)	(8,011)
Amounts allocated from: Future policy benefits	690	992
Deferred income tax benefit (expense)	1,181	1,474
Net unrealized investment gains (losses)	$ (4,442)	$ (5,545)