Investments (Net Unrealized Investment Gains (Losses)) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Components of net unrealized investment gains (losses) included in accumulated other comprehensive loss
Fixed maturity securities	$ (10,760)	$ (8,632)
Derivatives	501	628
Other	(5)	(7)
Subtotal	(10,264)	(8,011)
Amounts allocated from: Future policy benefits	1,412	992
Deferred income tax benefit (expense)	1,859	1,474
Net unrealized investment gains (losses)	$ (6,993)	$ (5,545)