Investments - Changes in Allowance for Credit Losses on AFS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-period	$ 110	$ 46
Additions from purchases of PCD debt securities	0	0
Additions for securities for which credit losses were not previously recognized	2	15
Additions (reductions) for securities for which credit losses were previously recognized	25	13
Reductions for disposed securities	(3)	0
Reductions for securities charged off	(23)	0
Balance as of end-of-period	111	74
Accrued interest receivable on fixed maturity AFS securities	954	911
Corporate bonds
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-period	53	14
Additions from purchases of PCD debt securities	0	0
Additions for securities for which credit losses were not previously recognized	2	7
Additions (reductions) for securities for which credit losses were previously recognized	7	2
Reductions for disposed securities	(1)	0
Reductions for securities charged off	(23)	0
Balance as of end-of-period	38	23
RMBS
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-period	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
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-period	50	24
Additions from purchases of PCD debt securities	0	0
Additions for securities for which credit losses were not previously recognized	0	8
Additions (reductions) for securities for which credit losses were previously recognized	18	12
Reductions for disposed securities	(2)	0
Reductions for securities charged off	0	0
Balance as of end-of-period	66	44
Hybrids
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-period	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	0
Reductions for securities charged off	0	0
Balance as of end-of-period	$ 1	$ 1