Financial Derivatives (Derivatives Total Notional or Contractual Amounts and Estimated Net Fair Values) (Details) (USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	$ 9,608	[1]	$ 5,757	[1]
Derivative Liability, Fair Value	7,429	[2]	4,935	[2]
Derivative Asset, Notional Amount	228,772		211,964
Derivative Liability, Notional Amount	147,737		133,529
Derivative, Collateral, Obligation to Return Cash	809	[1]	659	[1]
Derivative, Collateral, Right to Reclaim Cash	773	[2]	674	[2]
Legally Enforceable Master Netting Agreement Asset	5,664	[1]	3,203	[1]
Legally Enforceable Master Netting Agreement Liability	5,664	[2]	3,203	[2]
Derivative Asset, Fair Value, Net	3,135	[1]	1,895	[1]
Derivative Liability, Fair Value, Net	992	[2]	1,058	[2]
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	1,322	[1]	878	[1]
Derivative Liability, Fair Value	127	[2]	32	[2]
Derivative Asset, Notional Amount	9,394		9,878
Derivative Liability, Notional Amount	3,083		1,594
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	642	[1]	377	[1]
Derivative Liability, Fair Value	5	[2]	53	[2]
Derivative Asset, Notional Amount	14,683		13,635
Derivative Liability, Notional Amount	1,180		3,167
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	1,964	[1]	1,255	[1]
Derivative Liability, Fair Value	132	[2]	85	[2]
Derivative Asset, Notional Amount	24,077		23,513
Derivative Liability, Notional Amount	4,263		4,761
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	7,644	[1]	4,502	[1]
Derivative Liability, Fair Value	7,297	[2]	4,850	[2]
Derivative Asset, Notional Amount	204,695		188,451
Derivative Liability, Notional Amount	143,474		128,768
Not Designated as Hedging Instrument [Member] | Residential Mortgage [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	3,469	[1]	1,609	[1]
Derivative Liability, Fair Value	2,898	[2]	1,450	[2]
Derivative Asset, Notional Amount	130,773		124,001
Derivative Liability, Notional Amount	73,783		70,061
Not Designated as Hedging Instrument [Member] | Residential Mortgage [Member] | Residential Mortgage Servicing Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	3,393	[1]	1,490	[1]
Derivative Liability, Fair Value	2,853	[2]	1,419	[2]
Derivative Asset, Notional Amount	122,737		112,236
Derivative Liability, Notional Amount	69,383		66,476
Not Designated as Hedging Instrument [Member] | Residential Mortgage [Member] | Loan Sales Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	76	[1]	119	[1]
Derivative Liability, Fair Value	45	[2]	31	[2]
Derivative Asset, Notional Amount	8,036		11,765
Derivative Liability, Notional Amount	4,400		3,585
Not Designated as Hedging Instrument [Member] | Commercial Mortgage Banking [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	75	[1]	83	[1]
Derivative Liability, Fair Value	90	[2]	111	[2]
Derivative Asset, Notional Amount	1,780		1,369
Derivative Liability, Notional Amount	896		1,813
Not Designated as Hedging Instrument [Member] | Commercial Mortgage Banking [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	69	[1]	75	[1]
Derivative Liability, Fair Value	90	[2]	111	[2]
Derivative Asset, Notional Amount	1,685		1,159
Derivative Liability, Notional Amount	896		1,813
Not Designated as Hedging Instrument [Member] | Commercial Mortgage Banking [Member] | Credit Default Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	6	[1]	8	[1]
Derivative Asset, Notional Amount	95		210
Not Designated as Hedging Instrument [Member] | Customer Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	4,086	[1]	2,781	[1]
Derivative Liability, Fair Value	4,096	[2]	2,879	[2]
Derivative Asset, Notional Amount	70,425		59,285
Derivative Liability, Notional Amount	66,493		55,379
Not Designated as Hedging Instrument [Member] | Customer Contracts [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	3,778	[1]	2,611	[1]
Derivative Liability, Fair Value	3,869	[2]	2,703	[2]
Derivative Asset, Notional Amount	62,607		54,060
Derivative Liability, Notional Amount	59,434		49,619
Not Designated as Hedging Instrument [Member] | Customer Contracts [Member] | Equity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	16	[1]	16	[1]
Derivative Liability, Fair Value	18	[2]	19	[2]
Derivative Asset, Notional Amount	201		195
Derivative Liability, Notional Amount	142		139
Not Designated as Hedging Instrument [Member] | Customer Contracts [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	285	[1]	149	[1]
Derivative Liability, Fair Value	204	[2]	155	[2]
Derivative Asset, Notional Amount	6,206		3,659
Derivative Liability, Notional Amount	5,249		4,254
Not Designated as Hedging Instrument [Member] | Customer Contracts [Member] | Risk Participation Agreement [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	7	[1]	5	[1]
Derivative Liability, Fair Value	5	[2]	2	[2]
Derivative Asset, Notional Amount	1,411		1,371
Derivative Liability, Notional Amount	1,668		1,367
Not Designated as Hedging Instrument [Member] | Other Risk Management Activity [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	14	[1]	29	[1]
Derivative Liability, Fair Value	213	[2]	410	[2]
Derivative Asset, Notional Amount	1,717		3,796
Derivative Liability, Notional Amount	2,302		1,515
Not Designated as Hedging Instrument [Member] | Other Risk Management Activity [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	6	[1]	20	[1]
Derivative Liability, Fair Value	36	[2]	9	[2]
Derivative Asset, Notional Amount	1,459		3,420
Derivative Liability, Notional Amount	2,024		1,099
Not Designated as Hedging Instrument [Member] | Other Risk Management Activity [Member] | Credit Default Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	8	[1]	9	[1]
Derivative Liability, Fair Value	1	[2]	1	[2]
Derivative Asset, Notional Amount	258		376
Derivative Liability, Notional Amount	140		175
Not Designated as Hedging Instrument [Member] | Other Risk Management Activity [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	2	[2]	4	[2]
Derivative Liability, Notional Amount	27		32
Not Designated as Hedging Instrument [Member] | Other Risk Management Activity [Member] | Other Derivative Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	174	[2],[3]	396	[2],[3]
Derivative Liability, Notional Amount	$ 111	[3]	$ 209	[3]

[1] Included in Other Assets on our Consolidated Balance Sheet.

[2] Included in Other Liabilities on our Consolidated Balance Sheet.

[3] Includes PNC's obligation to fund a portion of certain BlackRock LTIP programs.