Income Taxes - Valuation Allowances (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Valuation Allowance [Line Items]
Valuation allowance, deferred tax assets	$ 0	$ 0
Accumulated other comprehensive income (loss)	(1,644)	(1,531)	$ (2,067)
Fixed maturities
Valuation Allowance [Line Items]
Accumulated other comprehensive income (loss)	(1,900)	$ (1,800)
Tax valuation allowance allocated to Net income (loss)
Valuation Allowance [Line Items]
Valuation allowance, deferred tax assets	$ 128