Goodwill and Other Intangible Assets - Schedule of Goodwill by Reportable Segment (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 1,510	$ 1,510
Additions	0	0
Goodwill, ending balance	1,510	1,510
Commercial, Consumer & Wealth
Goodwill [Roll Forward]
Goodwill, beginning balance	1,217	1,217
Additions	0	0
Goodwill, ending balance	1,217	1,217
Wholesale
Goodwill [Roll Forward]
Goodwill, beginning balance	293	293
Additions	0	0
Goodwill, ending balance	$ 293	$ 293