Investments - Changes in Allowance for Credit Losses on Mortgage Loans on Real Estate (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	$ 181
Additions (reductions) from provision for credit loss expense	(2)	$ 1
Balance as of end-of-period	179
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	112
Balance as of end-of-period	115
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	69
Balance as of end-of-period	64
Mortgage loans on real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	181	152
Additions (reductions) from provision for credit loss expense	(2)	1
Additions from purchases of PCD mortgage loans on real estate	0	0
Balance as of end-of-period	179	153
Credit loss (expense) reversal	1	1
Accrued investment income excluded from credit losses	113	101
Mortgage loans on real estate | Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	112	99
Additions (reductions) from provision for credit loss expense	3	(2)
Additions from purchases of PCD mortgage loans on real estate	0	0
Balance as of end-of-period	115	97
Mortgage loans on real estate | Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	69	53
Additions (reductions) from provision for credit loss expense	(5)	3
Additions from purchases of PCD mortgage loans on real estate	0	0
Balance as of end-of-period	$ 64	$ 56