Investments - Changes in Allowance for Credit Losses on AFS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	$ 21	$ 19	$ 13
Additions from purchases of PCD debt securities	0	0	0
Additions for securities for which credit losses were not previously recognized	25	7	9
Additions (reductions) for securities for which credit losses were previously recognized	(4)	9	5
Reductions for securities disposed	(2)	(2)	(2)
Reductions for securities charged-off	(21)	(12)	(6)
Balance as of end-of-period	19	21	19
Accrued interest receivable on fixed maturity AFS securities	814	1,100	944
Corporate bonds
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	9	17	12
Additions from purchases of PCD debt securities	0	0	0
Additions for securities for which credit losses were not previously recognized	24	4	8
Additions (reductions) for securities for which credit losses were previously recognized	(2)	2	5
Reductions for securities disposed	(2)	(2)	(2)
Reductions for securities charged-off	(21)	(12)	(6)
Balance as of end-of-period	8	9	17
RMBS
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	7	1	1
Additions from purchases of PCD debt securities	0	0	0
Additions for securities for which credit losses were not previously recognized	1	3	0
Additions (reductions) for securities for which credit losses were previously recognized	(2)	3	0
Reductions for securities disposed	0	0	0
Reductions for securities charged-off	0	0	0
Balance as of end-of-period	6	7	1
Other
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	5	1	0
Additions from purchases of PCD debt securities	0	0	0
Additions for securities for which credit losses were not previously recognized	0	0	1
Additions (reductions) for securities for which credit losses were previously recognized	0	4	0
Reductions for securities disposed	0	0	0
Reductions for securities charged-off	0	0	0
Balance as of end-of-period	$ 5	$ 5	$ 1