Investments - Changes in Allowance for Credit Losses on Mortgage Loans on Real Estate (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year			$ 114
Additions (reductions) from provision for credit loss expense	$ 18	$ 3	18	$ 7
Balance as of end-of-year	133		133
Accrued interest receivable excluded from credit losses	81	53	81	53
Mortgage loans on real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	115	103	114	99
Additions (reductions) from provision for credit loss expense	18	2	19	6
Additions from purchases of PCD mortgage loans on real estate	0	0	0	0
Balance as of end-of-year	133	105	133	105
Credit loss expense (reversal)	1	(1)	1	(1)
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year			86
Balance as of end-of-year	93		93
Commercial | Mortgage loans on real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	84	83	86	84
Additions (reductions) from provision for credit loss expense	9	(1)	7	(2)
Additions from purchases of PCD mortgage loans on real estate	0	0	0	0
Balance as of end-of-year	93	82	93	82
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year			28
Balance as of end-of-year	40		40
Residential | Mortgage loans on real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	31	20	28	15
Additions (reductions) from provision for credit loss expense	9	3	12	8
Additions from purchases of PCD mortgage loans on real estate	0	0	0	0
Balance as of end-of-year	$ 40	$ 23	$ 40	$ 23