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Operating Segments - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) segment	Jun. 30, 2025 USD ($)
Segment Reporting [Line Items]
Number of reportable segments | segment			2
Number of operating segments | segment			2
Decrease in net interest income	$ (3,621)	$ (3,587)	$ (7,220)	$ (7,094)
CSBB
Segment Reporting [Line Items]
Decrease in net interest income	(1,624)	(1,496)	(3,229)	(2,931)
CSBB | Reclassification, Segmentation Basis Change, Adjustment
Segment Reporting [Line Items]
Decrease in net interest income		27		56
WB
Segment Reporting [Line Items]
Decrease in net interest income	$ (1,942)	(1,872)	$ (3,864)	(3,756)
WB | Reclassification, Segmentation Basis Change, Adjustment
Segment Reporting [Line Items]
Decrease in net interest income		$ 99		$ 196

X

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