Goodwill and Other Intangible Assets - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2024 USD ($)
Goodwill Adjustments [Line Items]
Goodwill Segment Realignment	$ 0
CSBB
Goodwill Adjustments [Line Items]
Goodwill Segment Realignment	(1,498)
CSBB | Small Business Banking [Member]
Goodwill Adjustments [Line Items]
Goodwill Segment Realignment	1,700
WB
Goodwill Adjustments [Line Items]
Goodwill Segment Realignment	1,498
WB | Wealth
Goodwill Adjustments [Line Items]
Goodwill Segment Realignment	$ 220