Fair Value (Nonrecurring Fair Value Measurements) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total mortgage loans	$ 87,908		$ 89,012
Other invested assets, at estimated fair value (2)	17,470		18,504
Fair Value, Nonrecurring | Mortgages
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Adjustment	(171)	$ (48)
Level 3 | Fair Value, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total mortgage loans	1,901		1,075
Other invested assets, at estimated fair value (2)	$ 0		$ 63