Fair Value (Nonrecurring Fair Value Measurements) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total mortgage loans	$ 86,868		$ 86,868		$ 89,012
Other invested assets, at estimated fair value (2)	16,352		16,352		18,504
Fair Value, Nonrecurring | Mortgages
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Adjustment	(241)	$ (105)	(412)	$ (154)
Level 3 | Fair Value, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total mortgage loans	1,952		1,952		1,075
Other invested assets, at estimated fair value (2)	$ 0		$ 0		$ 63