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
Balance as of end-of-year	152	$ 114
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	86
Balance as of end-of-year	99	86
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	28
Balance as of end-of-year	53	28
Mortgage loans on real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	114	98	$ 95
Additions (reductions) from provision for credit loss expense	88	16	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	98
Credit loss (expense) reversal	1	(1)
Accrued interest receivable excluded from credit losses	94	67	51
Mortgage loans on real estate | Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	86	83	78
Additions (reductions) from provision for credit loss expense	63	3	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	83
Mortgage loans on real estate | Residential
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