Loan Sale and Servicing Activities and Variable Interest Entities (Non-Consolidated VIEs) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
PNC Risk of Loss	$ 24,018	$ 22,573
Carrying Value of Assets Owned by PNC	541,246	557,191
Carrying Value of Liabilities Owned by PNC	492,030	501,465
Variable Interest Entity, Primary Beneficiary
Carrying Value of Assets Owned by PNC	24,007	22,601
Carrying Value of Liabilities Owned by PNC	1,861	1,799
Variable Interest Entity, Primary Beneficiary | Mortgage-Backed Securitizations
PNC Risk of Loss	20,052	18,708
Carrying Value of Assets Owned by PNC	20,052	18,708
Carrying Value of Liabilities Owned by PNC	1	1
Variable Interest Entity, Primary Beneficiary | Tax Credit Investments And Other
PNC Risk of Loss	3,966	3,865
Carrying Value of Assets Owned by PNC	3,955	3,893
Carrying Value of Liabilities Owned by PNC	$ 1,860	$ 1,798