Investments - Credit Loss Expense Incurred (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total intent to sell impairments	$ 0	$ (3,062)	$ 0	$ (3,062)
Total credit loss benefit (expense)	(16)	(2)	(17)	(20)
Realized Gain (Loss)
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total credit loss benefit (expense)	(23)	1	(25)	(15)
Corporate bonds
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total intent to sell impairments	0	(2,748)	0	(2,748)
Total credit loss benefit (expense)	(1)	(2)	(2)	(20)
Corporate bonds | Realized Gain (Loss)
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total credit loss benefit (expense)	(8)	1	(10)	(16)
State and municipal bonds
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total intent to sell impairments	0	(151)	0	(151)
RMBS
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total intent to sell impairments	0	(55)	0	(55)
Total credit loss benefit (expense)	0	0	0	0
RMBS | Realized Gain (Loss)
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total credit loss benefit (expense)	0	0	0	1
CMBS
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total intent to sell impairments	0	(52)	0	(52)
ABS
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total intent to sell impairments	0	(53)	0	(53)
Total credit loss benefit (expense)	(15)	0	(15)	0
ABS | Realized Gain (Loss)
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total credit loss benefit (expense)	(15)	0	(15)	0
Hybrid and redeemable preferred securities
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Total intent to sell impairments	$ 0	$ (3)	$ 0	$ (3)