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-period			$ 152
Additions (reductions) from provision for credit loss expense	$ 8	$ 17	10	$ 17
Balance as of end-of-period	162		162
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-period			99
Balance as of end-of-period	97		97
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-period			53
Balance as of end-of-period	65		65
Mortgage loans on real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-period	153	115	152	114
Additions (reductions) from provision for credit loss expense	9	17	10	18
Additions from purchases of PCD mortgage loans on real estate	0	0	0	0
Balance as of end-of-period	162	132	162	132
Credit loss (expense) reversal	1	1	1	1
Accrued investment income excluded from credit losses	107	80	107	80
Mortgage loans on real estate | Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-period	97	84	99	86
Additions (reductions) from provision for credit loss expense	0	8	(2)	6
Additions from purchases of PCD mortgage loans on real estate	0	0	0	0
Balance as of end-of-period	97	92	97	92
Mortgage loans on real estate | Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-period	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-period	$ 65	$ 40	$ 65	$ 40