Segment Reporting - Reconciliation of Business Segment Results to Consolidated (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total revenue	$ 21,555	$ 21,490	$ 21,120
Total noninterest expense	13,524	14,012	13,170
Net income	5,953	5,647	6,113
Average assets	564,883	558,770	550,652
Operating Segments
Segment Reporting Information [Line Items]
Total revenue	26,345	23,646	20,851
Total noninterest expense	12,368	12,400	12,335
Net income	10,232	8,139	6,246
Average assets	359,852	364,063	348,275
Other Segments
Segment Reporting Information [Line Items]
Total revenue	(4,790)	(2,156)	269
Total noninterest expense	924	897	835
Net income	(4,047)	(1,777)	(133)
Average assets	205,031	194,707	202,377
Segment Reporting, Reconciling Item, Corporate Nonsegment
Segment Reporting Information [Line Items]
FDIC special assessment	112	$ 515
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]		Total noninterest expense
Workforce reduction charges		$ 150
PNC Foundation contribution	$ (120)	$ (50)