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Business Segments - Narrative (Details)
$ in Millions
9 Months Ended
Sep. 30, 2025
USD ($)
segment
Jan. 01, 2025
USD ($)
Dec. 31, 2024
USD ($)
Segment Reporting Information      
Number of business segments | segment 3    
Goodwill $ 4,947   $ 4,918
Operating Segments | Consumer and Small Business Banking      
Segment Reporting Information      
Goodwill   $ 73