Accumulated Other Comprehensive Income (Loss) - Changes in AOCI, including Reclassification Adjustments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Components Of Accumulated Other Comprehensive Income Loss [Line Items]
Net unrealized gains/losses on securities	$ 620	$ (170)	$ 694
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	56	1	21
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, before Tax, Portion Attributable to Parent, Total	622	(170)	661
Net unrealized gains/losses on securities	(130)	35	(146)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	(12)	0	(4)
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax	(142)	35	(150)
Net unrealized gains/losses on securities	490	(135)	548
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	44	1	17
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax, Total	534	(134)	565
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	(44)	14	(36)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	10	15	18
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax	(54)	(1)	(54)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	(9)	3	(8)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	2	3	4
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	(11)	0	(12)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	(35)	11	(28)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	8	12	14
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	(43)	(1)	(42)
Change in current discount rate	24	28	16
OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment, Tax	5	6	3
OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment and Tax	$ 19	$ 22	$ 13