Loan Sale and Servicing Activities and Variable Interest Entities (Non-Consolidated VIEs) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
PNC Risk of Loss	$ 19,977	$ 21,328
Carrying Value of Assets Owned by PNC	474,414	466,679
Carrying Value of Liabilities Owned by PNC	420,535	412,638
Variable Interest Entity, Primary Beneficiary
Carrying Value of Assets Owned by PNC	19,960	21,101
Carrying Value of Liabilities Owned by PNC	1,426	1,199
Variable Interest Entity, Primary Beneficiary | Mortgage-Backed Securitizations
PNC Risk of Loss	16,883	18,207
Carrying Value of Assets Owned by PNC	16,883	18,207
Carrying Value of Liabilities Owned by PNC	1	1
Variable Interest Entity, Primary Beneficiary | Tax Credit Investments And Other
PNC Risk of Loss	3,094	3,121
Carrying Value of Assets Owned by PNC	3,077	2,894
Carrying Value of Liabilities Owned by PNC	$ 1,425	$ 1,198