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	$ (4,213)	$ 0
Total credit loss benefit (expense)	(25)	(25)	(7)
Realized Gain (Loss)
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total credit loss benefit (expense)	(42)	(21)	(14)
Corporate bonds
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total intent to sell impairments	0	(3,805)	0
Total credit loss benefit (expense)	(10)	(24)	(4)
Corporate bonds | Realized Gain (Loss)
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total credit loss benefit (expense)	(21)	(23)	(4)
State and municipal bonds
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total intent to sell impairments	0	(214)	0
RMBS
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total intent to sell impairments	0	(74)	0
Total credit loss benefit (expense)	0	(1)	(3)
RMBS | Realized Gain (Loss)
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
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	(60)	0
ABS
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total intent to sell impairments	0	(57)	0
Total credit loss benefit (expense)	(15)	0	0
ABS | Realized Gain (Loss)
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
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	$ (3)	$ 0