Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	4 Months Ended	12 Months Ended
		Feb. 28, 2018	May 04, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 17, 2018	Jan. 16, 2018	Jan. 04, 2018	May 05, 2010
Debt Instrument [Line Items]
Preferred stock redemption, value						$ 500
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	[1]			$ 1,000
Common stock, issued				542,000,000	542,000,000
Stock Issued During Period, Shares, Dividend Reinvestment Plan				200,000	300,000	300,000
Stock Repurchase Plan 2014
Debt Instrument [Line Items]
Shares Repurchased Under Stock Repurchase Program						4,400,000
Stock Repurchase Plan 2015
Debt Instrument [Line Items]
Shares Repurchased Under Stock Repurchase Program				18,600,000	22,800,000
Stock Repurchase Program, Number of Shares Authorized to be Repurchased						100,000,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased				40,700,000
Series K Preferred Stock
Debt Instrument [Line Items]
Depositary Shares	[2]		500,000
Preferred stock redemption, shares	[2]		50,000
Preferred stock redemption, value			$ 500
TARP Warrant
Debt Instrument [Line Items]
Number of warrants or rights outstanding				3,500,000	11,300,000					16,900,000
Class of warrant or right exercised				7,800,000
Exercise price per share of warrants or rights outstanding				$ 67.24
TARP Warrant | Common Stock
Debt Instrument [Line Items]
Common stock, issued				3,500,000
PNC Preferred Funding Trust II
Debt Instrument [Line Items]
Fixed to Floating Rate Of Non Cumulative Exchangeable Trust securities				2.19%
PNC Preferred Funding Trust I
Debt Instrument [Line Items]
Fixed to Floating Rate Of Non Cumulative Exchangeable Trust securities				2.61%
PNC Capital Trust C
Debt Instrument [Line Items]
Principal Amount Of Junior Subordinated Debt				$ 200
Shares Issued To Exercising Warrant Holders
Debt Instrument [Line Items]
Common Stock, Capital Shares Reserved for Future Issuance				92,000,000
Dividend Declared
Debt Instrument [Line Items]
Dividends Payable, Amount Per Share				$ 0.66
Subsequent Event | TARP Warrant
Debt Instrument [Line Items]
Exercise price per share of warrants or rights outstanding							$ 67.20	$ 67.24
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right							1
Subsequent Event | PNC Preferred Funding Trust II
Debt Instrument [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		$ 500
Subsequent Event | Dividend Declared
Debt Instrument [Line Items]
Dividends Payable, Amount Per Share									$ 0.75

[1] Relates to the redemption of Perpetual Trust Securities in the first quarter of 2017. See Note 15 Equity for additional information.

[2] On May 4, 2015, we redeemed all 50,000 shares of our Series K preferred stock, as well as all 500,000 Depositary Shares representing fractional interests in such shares, resulting in net outflow of $500 million.