Loan Sale and Servicing Activities and Variable Interest Entities (Non-Consolidated VIEs) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
PNC Risk of Loss	$ 21,328	$ 22,418
Carrying Value of Assets Owned by PNC	466,679	410,295
Carrying Value of Liabilities Owned by PNC	412,638	360,952
Variable Interest Entity, Primary Beneficiary
Carrying Value of Assets Owned by PNC	21,101	22,315
Carrying Value of Liabilities Owned by PNC	1,199	1,101
Mortgage-Backed Securitizations | Variable Interest Entity, Primary Beneficiary
PNC Risk of Loss	18,207	19,287
Carrying Value of Assets Owned by PNC	18,207	19,287
Carrying Value of Liabilities Owned by PNC	1
Tax Credit Investments And Other | Variable Interest Entity, Primary Beneficiary
PNC Risk of Loss	3,121	3,131
Carrying Value of Assets Owned by PNC	2,894	3,028
Carrying Value of Liabilities Owned by PNC	$ 1,198	$ 1,101