Borrowed Funds (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total Borrowed Funds	$ 54,532	$ 56,768
Due in 2016	10,900
Due in 2017	10,600
Due in 2018	11,200
Due in 2019	8,400
Due in 2020	4,700
Due in 2021 and thereafter	8,700
Bank notes [Member]
Debt Instrument [Line Items]
Basis adjustments - Fair value accounting hedges	36
Senior debt [Member]
Debt Instrument [Line Items]
Basis adjustments - Fair value accounting hedges	175
Subordinated debt [Member]
Debt Instrument [Line Items]
Total Borrowed Funds	8,556
Basis adjustments - Fair value accounting hedges	246
FHLB Borrowings [Member]
Debt Instrument [Line Items]
Total Borrowed Funds	20,108
PNC Capital Trust C [Member]
Debt Instrument [Line Items]
Carrrying value - junior subordinated debt	$ 205
Issuance Date - trust preferred securities	Jun. 01, 1998
Trust preferred securities	$ 200
Basis Spread on LIBOR Rate - trust preferred securities	0.57%
Maturity date - trust preferred securities	Jun. 01, 2028
Effective interest rate - trust preferred securities	0.98%
Net discounts - junior subordinated debt	$ (1)
Principal - junior subordinate debt	$ 206

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Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments.

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