Investments - Changes in Allowance for Credit Losses on AFS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	$ 46	$ 19
Additions from purchases of PCD debt securities	0	0
Additions for securities for which credit losses were not previously recognized	14	1
Additions (reductions) for securities for which credit losses were previously recognized	13	2
Reductions for disposed securities		(1)
Reductions for securities charged off	0	0
Balance as of end-of-period	73	21
Accrued investment income on fixed maturity AFS securities	802	847
Corporate bonds
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	14	8
Additions from purchases of PCD debt securities	0	0
Additions for securities for which credit losses were not previously recognized	7	1
Additions (reductions) for securities for which credit losses were previously recognized	2	2
Reductions for disposed securities		(1)
Reductions for securities charged off	0	0
Balance as of end-of-period	23	10
RMBS
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	7	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	(1)	0
Reductions for disposed securities		0
Reductions for securities charged off	0	0
Balance as of end-of-period	6	6
ABS
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	24	4
Additions from purchases of PCD debt securities	0	0
Additions for securities for which credit losses were not previously recognized	7	0
Additions (reductions) for securities for which credit losses were previously recognized	12	0
Reductions for disposed securities		0
Reductions for securities charged off	0	0
Balance as of end-of-period	43	4
Hybrids
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	1	1
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
Reductions for securities charged off	0	0
Balance as of end-of-period	$ 1	$ 1