Investments - Changes in Allowance for Credit Losses on AFS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	$ 19	$ 22
Additions from purchases of PCD debt securities	0	0
Additions for securities for which credit losses were not previously recognized	1	19
Additions (reductions) for securities for which credit losses were previously recognized	2	(1)
Reductions for disposed securities	(1)	(1)
Balance as of end-of-period	21	39
Accrued interest receivable on fixed maturity AFS securities	943	1,100
Corporate bonds
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	8	9
Additions from purchases of PCD debt securities	0	0
Additions for securities for which credit losses were not previously recognized	1	19
Additions (reductions) for securities for which credit losses were previously recognized	2	0
Reductions for disposed securities	(1)	(1)
Balance as of end-of-period	10	27
RMBS
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	6	7
Additions from purchases of PCD debt securities	0	0
Additions for securities for which credit losses were not previously recognized	0	0
Additions (reductions) for securities for which credit losses were previously recognized	0	(1)
Reductions for disposed securities	0	0
Balance as of end-of-period	6	6
Other
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	5	6
Additions from purchases of PCD debt securities	0	0
Additions for securities for which credit losses were not previously recognized	0	0
Additions (reductions) for securities for which credit losses were previously recognized	0	0
Reductions for disposed securities	0	0
Balance as of end-of-period	$ 5	$ 6