Investments - Changes in Allowance for Credit Losses on Mortgage Loans on Real Estate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	$ 114
Additions (reductions) from provision for credit loss expense	88	$ 16	$ 3
Balance as of end-of-year	152	114
Mortgage loans on real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	114	99	96
Additions (reductions) from provision for credit loss expense	88	15	3
Additions from purchases of PCD mortgage loans on real estate	0	0	0
Reductions for mortgage loans on real estate charged off	(50)
Balance as of end-of-year	152	114	99
Credit loss expense (reversal)	1	(1)	0
Accrued interest receivable excluded from credit losses	94	68	51
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	86
Balance as of end-of-year	99	86
Commercial | Mortgage loans on real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	86	84	79
Additions (reductions) from provision for credit loss expense	63	2	5
Additions from purchases of PCD mortgage loans on real estate	0	0	0
Reductions for mortgage loans on real estate charged off	(50)
Balance as of end-of-year	99	86	84
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	28
Balance as of end-of-year	53	28
Residential | Mortgage loans on real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	28	15	17
Additions (reductions) from provision for credit loss expense	25	13	(2)
Additions from purchases of PCD mortgage loans on real estate	0	0	0
Reductions for mortgage loans on real estate charged off	0
Balance as of end-of-year	$ 53	$ 28	$ 15