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Segment Reporting - Reconciliation of Business Segment Results to Consolidated (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Total revenue $ 5,915 $ 5,432 $ 17,028 $ 15,988
Total noninterest expense 3,461 3,327 10,231 10,018
Net income 1,822 1,505 4,964 4,326
Average Assets 571,533 569,513 563,304 565,146
Operating Segments        
Segment Reporting Information [Line Items]        
Total revenue 7,120 6,505 20,561 19,663
Total noninterest expense 3,190 3,062 9,435 9,099
Net income 2,914 2,479 8,129 7,668
Average Assets 367,059 358,444 362,316 359,913
Other Segments        
Segment Reporting Information [Line Items]        
Total revenue (1,205) (1,073) (3,533) (3,675)
Average Assets 204,474 211,069 200,988 205,233
Other Segments | Other Reclassification Activities        
Segment Reporting Information [Line Items]        
Total noninterest expense 319 265 844 669
Net income (1,140) (974) (3,213) (3,092)
Segment Reporting, Reconciling Item, Corporate Nonsegment | FDIC Special Assessment        
Segment Reporting Information [Line Items]        
Total noninterest expense (48) 0 (48) 130
Net income 48 0 48 (130)
Segment Reporting, Reconciling Item, Corporate Nonsegment | PNC Foundation Contribution        
Segment Reporting Information [Line Items]        
Total noninterest expense 0 0 0 120
Net income $ 0 $ 0 $ 0 $ (120)