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, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-period			$ 181
Additions (reductions) from provision for credit loss expense	$ 5	$ 8	3	$ 10
Balance as of end-of-period	176		176
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-period			112
Balance as of end-of-period	110		110
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-period			69
Balance as of end-of-period	66		66
Mortgage loans on real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-period	179	153	181	152
Additions (reductions) from provision for credit loss expense	6	9	4	10
Additions from purchases of PCD mortgage loans on real estate	0	0	0	0
Reductions for mortgage loans on real estate charged off	(9)		(9)
Balance as of end-of-period	176	162	176	162
Credit loss (expense) reversal	1	1	1	1
Accrued investment income excluded from credit losses	119	107	119	107
Mortgage loans on real estate | Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-period	115	97	112	99
Additions (reductions) from provision for credit loss expense	4	0	7	(2)
Additions from purchases of PCD mortgage loans on real estate	0	0	0	0
Reductions for mortgage loans on real estate charged off	(9)		(9)
Balance as of end-of-period	110	97	110	97
Mortgage loans on real estate | Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-period	64	56	69	53
Additions (reductions) from provision for credit loss expense	2	9	(3)	12
Additions from purchases of PCD mortgage loans on real estate	0	0	0	0
Reductions for mortgage loans on real estate charged off	0		0
Balance as of end-of-period	$ 66	$ 65	$ 66	$ 65