Capital (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 9,451	$ 9,831	$ 8,751
OCI, Unrealized Holding Gain (Loss) on Securities	210	151	(64)
Total other comprehensive income (loss)	210	151	(63)
Ending Balance	10,487	9,451	9,831
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(29)	(180)	(117)
OCI, Unrealized Holding Gain (Loss) on Securities	210	151	(64)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax			1
Ending Balance	$ 181	$ (29)	$ (180)