Financial Derivatives (Derivatives Total Notional or Contractual Amounts and Estimated Net Fair Values) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	$ 9,463		$ 5,757
Derivative Liability, Fair Value	7,606		4,935
Derivative Asset, Notional Amount	242,425		211,964
Derivative Liability, Notional Amount	148,904		133,529
Derivative, Collateral, Obligation to Return Cash	1,051		659
Derivative, Collateral, Right to Reclaim Cash	843		674
Legally Enforceable Master Netting Agreement Asset	6,052		3,203
Legally Enforceable Master Netting Agreement Liability	6,052		3,203
Derivative Asset, Fair Value, Net	2,360		1,895
Derivative Liability, Fair Value, Net	711		1,058
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	1,888		1,255
Derivative Liability, Fair Value	116		85
Derivative Asset, Notional Amount	27,018		23,513
Derivative Liability, Notional Amount	2,216		4,761
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	7,575		4,502
Derivative Liability, Fair Value	7,490		4,850
Derivative Asset, Notional Amount	215,407		188,451
Derivative Liability, Notional Amount	146,688		128,768
Not Designated as Hedging Instrument [Member] | Residential Mortgage [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	3,458		1,609
Derivative Liability, Fair Value	2,893		1,450
Derivative Asset, Notional Amount	129,789		124,001
Derivative Liability, Notional Amount	67,202		70,061
Not Designated as Hedging Instrument [Member] | Residential Mortgage [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	3,390		1,490
Derivative Liability, Fair Value	2,854		1,419
Derivative Asset, Notional Amount	122,395		112,236
Derivative Liability, Notional Amount	63,226		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	68		119
Derivative Liability, Fair Value	39		31
Derivative Asset, Notional Amount	7,394		11,765
Derivative Liability, Notional Amount	3,976		3,585
Not Designated as Hedging Instrument [Member] | Commercial Mortgage Banking [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	59		83
Derivative Liability, Fair Value	80		111
Derivative Asset, Notional Amount	1,571		1,369
Derivative Liability, Notional Amount	1,149		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	54		75
Derivative Liability, Fair Value	80		111
Derivative Asset, Notional Amount	1,476		1,159
Derivative Liability, Notional Amount	1,149		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	5		8
Derivative Asset, Notional Amount	95		210
Not Designated as Hedging Instrument [Member] | Customer Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	4,046		2,781
Derivative Liability, Fair Value	4,178		2,879
Derivative Asset, Notional Amount	81,648		59,285
Derivative Liability, Notional Amount	76,447		55,379
Not Designated as Hedging Instrument [Member] | Customer Contracts [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	3,804		2,611
Derivative Liability, Fair Value	3,943		2,703
Derivative Asset, Notional Amount	73,751		54,060
Derivative Liability, Notional Amount	68,981		49,619
Not Designated as Hedging Instrument [Member] | Customer Contracts [Member] | Equity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	5		16
Derivative Liability, Fair Value	8		19
Derivative Asset, Notional Amount	118		195
Derivative Liability, Notional Amount	66		139
Not Designated as Hedging Instrument [Member] | Customer Contracts [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	231		149
Derivative Liability, Fair Value	222		155
Derivative Asset, Notional Amount	6,088		3,659
Derivative Liability, Notional Amount	5,832		4,254
Not Designated as Hedging Instrument [Member] | Customer Contracts [Member] | Risk Participation Agreement [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	6		5
Derivative Liability, Fair Value	5		2
Derivative Asset, Notional Amount	1,691		1,371
Derivative Liability, Notional Amount	1,568		1,367
Not Designated as Hedging Instrument [Member] | Other Risk Management Activity [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	12		29
Derivative Liability, Fair Value	339		410
Derivative Asset, Notional Amount	2,399		3,796
Derivative Liability, Notional Amount	1,890		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		20
Derivative Liability, Fair Value	39		9
Derivative Asset, Notional Amount	2,190		3,420
Derivative Liability, Notional Amount	1,479		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	6		9
Derivative Liability, Fair Value			1
Derivative Asset, Notional Amount	209		376
Derivative Liability, Notional Amount			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	4		4
Derivative Liability, Notional Amount	25		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	296	[1]	396	[1]
Derivative Liability, Notional Amount	386	[1]	209	[1]
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	1,316		878
Derivative Liability, Fair Value	116		32
Derivative Asset, Notional Amount	10,476		9,878
Derivative Liability, Notional Amount	1,797		1,594
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	572		377
Derivative Liability, Fair Value			53
Derivative Asset, Notional Amount	16,542		13,635
Derivative Liability, Notional Amount	93		3,167
Net Investment Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	$ 326

[1] Includes PNC's obligation to fund a portion of certain BlackRock LTIP programs and other contracts.