Investments - Credit Loss Expense Incurred (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total intent to sell impairments	$ 0	$ (1,091)	$ 0
Total credit loss benefit (expense)	(42)	(22)	(15)
Corporate bonds
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total intent to sell impairments	0	(941)	0
Total credit loss benefit (expense)	(21)	(24)	(5)
State and municipal bonds
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total intent to sell impairments	0	(48)	0
RMBS
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total intent to sell impairments	0	(28)	0
Total credit loss benefit (expense)	(1)	1	(6)
CMBS
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total intent to sell impairments	0	(36)	0
ABS
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total intent to sell impairments	0	(37)	0
Total credit loss benefit (expense)	(20)	1	(4)
Hybrid and redeemable preferred securities
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total intent to sell impairments	$ 0	$ (1)	$ 0