Investments - Net Realized Capital Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Available-for-sale Securities Including Securities Pledged [Line Items]
Realized capital gains (losses)	$ (56)	$ (50)	$ (107)	$ (69)
Derivatives
Available-for-sale Securities Including Securities Pledged [Line Items]
Realized capital gains (losses)	29	(33)	48	(70)
Mortgages [Member]
Available-for-sale Securities Including Securities Pledged [Line Items]
Realized capital gains (losses)	(1)	1	(1)	(3)
Other than Securities Investment
Available-for-sale Securities Including Securities Pledged [Line Items]
Realized capital gains (losses)	(10)	7	(13)	12
Fixed Maturities, Available-for-sale, Including Securities Pledged
Available-for-sale Securities Including Securities Pledged [Line Items]
Realized capital gains (losses)	(8)	(22)	(24)	(18)
Fixed Maturities, at Fair Value Using the Fair Value Option
Available-for-sale Securities Including Securities Pledged [Line Items]
Realized capital gains (losses)	(67)	(3)	(116)	9
Equity securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Realized capital gains (losses)	$ 1	$ 0	$ (1)	$ 1