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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year			$ 152
Additions (reductions) from provision for credit loss expense	$ 8	$ 18	10	$ 18
Balance as of end-of-year	162		162
Accrued interest receivable excluded from credit losses	107	81	107	81
Mortgage loans on real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	154	115	152	114
Additions (reductions) from provision for credit loss expense	8	18	10	19
Additions from purchases of PCD mortgage loans on real estate	0	0	0	0
Balance as of end-of-year	162	133	162	133
Credit loss expense (reversal)	1	1	1	1
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year			99
Balance as of end-of-year	97		97
Commercial | Mortgage loans on real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	98	84	99	86
Additions (reductions) from provision for credit loss expense	(1)	9	(2)	7
Additions from purchases of PCD mortgage loans on real estate	0	0	0	0
Balance as of end-of-year	97	93	97	93
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year			53
Balance as of end-of-year	65		65
Residential | Mortgage loans on real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	56	31	53	28
Additions (reductions) from provision for credit loss expense	9	9	12	12
Additions from purchases of PCD mortgage loans on real estate	0	0	0	0
Balance as of end-of-year	$ 65	$ 40	$ 65	$ 40