Investments - Changes in Allowance for Credit Losses on Mortgage Loans on Real Estate (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year			$ 114
Additions (reductions) from provision for credit loss expense	$ 47	$ 9	65	$ 16
Balance as of end-of-year	170		170
Accrued interest receivable excluded from credit losses	89	54	89	54
Mortgage loans on real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	133	105	114	99
Additions (reductions) from provision for credit loss expense	47	8	66	14
Additions from purchases of PCD mortgage loans on real estate	0	0	0	0
Reductions for mortgage loans on real estate charged-off	(10)		(10)
Balance as of end-of-year	170	113	170	113
Credit loss expense (reversal)	1	(1)	1	(2)
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year			86
Balance as of end-of-year	123		123
Commercial | Mortgage loans on real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	93	82	86	84
Additions (reductions) from provision for credit loss expense	40	7	47	5
Additions from purchases of PCD mortgage loans on real estate	0	0	0	0
Reductions for mortgage loans on real estate charged-off	(10)		(10)
Balance as of end-of-year	123	89	123	89
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year			28
Balance as of end-of-year	47		47
Residential | Mortgage loans on real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	40	23	28	15
Additions (reductions) from provision for credit loss expense	7	1	19	9
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-year	$ 47	$ 24	$ 47	$ 24