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Loan Sale and Servicing Activities and Variable Interest Entities (Non-Consolidated VIEs) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
PNC Risk of Loss	$ 21,001	$ 21,328
Carrying Value of Assets Owned by PNC	553,515	466,679
Carrying Value of Liabilities Owned by PNC	497,218	412,638
Variable Interest Entity, Primary Beneficiary
Carrying Value of Assets Owned by PNC	21,175	21,101
Carrying Value of Liabilities Owned by PNC	1,848	1,199
Variable Interest Entity, Primary Beneficiary | Mortgage-Backed Securitizations
PNC Risk of Loss	17,223	18,207
Carrying Value of Assets Owned by PNC	17,223	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	3,778	3,121
Carrying Value of Assets Owned by PNC	3,952	2,894
Carrying Value of Liabilities Owned by PNC	$ 1,847	$ 1,198

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