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Employee Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2011
Employee Benefit Plans [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
Reconciliation of Changes in Projected Benefit Obligation and Change in Plan Assets           
                    
  Qualified Nonqualified Postretirement 
  Pension Pension Benefits 
December 31 (Measurement Date) – in millions 2011  2010  2011  2010  2011  2010 
Accumulated benefit obligation at end of year$ 4,095 $ 3,619 $ 289 $ 286       
Projected benefit obligation at beginning of year$ 3,803 $ 3,611 $ 290 $ 282 $ 393 $ 374 
Service cost  94   102   4   3   7   5 
Interest cost  196   203   13   14   19   20 
Actuarial losses and changes in assumptions  304   92   15   11   (1)   20 
Participant contributions              13   14 
Federal Medicare subsidy on benefits paid              2   2 
Early Retirement Reinsurance Program payments received              1    
Benefits paid  (209)   (205)   (25)   (20)   (37)   (42) 
 Projected benefit obligation at end of year$ 4,188 $ 3,803 $ 297 $ 290 $ 397 $ 393 
Fair value of plan assets at beginning of year$ 3,991 $ 3,721             
Actual return on plan assets  23   475             
Employer contribution      $ 25 $ 20 $ 22 $ 26 
Participant contributions              13   14 
Federal Medicare subsidy on benefits paid              2   2 
Benefits paid  (209)   (205)   (25)   (20)   (37)   (42) 
 Fair value of plan assets at end of year$ 3,805 $ 3,991             
Funded status$ (383) $ 188 $ (297) $ (290) $ (397) $ (393) 
Amounts recognized in the statement of financial positions                  
 Noncurrent asset     188             
 Current liability        (30)   (33)   (34)   (35) 
 Noncurrent liability  (383)      (267)   (257)   (363)   (358) 
 Net amount recognized on the balance sheet$ (383) $ 188 $ (297) $ (290) $ (397) $ (393) 
Amounts recognized in accumulated other comprehensive                   
 income consist of:                  
Prior service cost (credit)$ (39) $ (46) $ 2 $ 2 $ (11) $ (14) 
Net actuarial loss  1,087   526   71   61   54   55 
 Amount recognized in AOCI$ 1,048 $ 480 $ 73 $ 63 $ 43 $ 41 
Asset Strategy Allocations [Table Text Block]
Asset Strategy Allocations         
  Percentage 
  of Plan 
 TargetAssets by 
 AllocationStrategy at 
 RangeDecember 31 
PNC Pension Plan    20112010 
Asset Category         
Domestic Equity20-40% 41% 40% 
International Equity10-25% 21% 21% 
Private Equity0-10% 3% 2% 
Total Equity40-70% 65% 63% 
Domestic Fixed Income20-40% 20% 24% 
High Yield Fixed Income0-15% 12% 10% 
Total Fixed Income20-55% 32% 34% 
Real estate0-10% 3% 3% 
Other0-5%0%0% 
Total     100% 100% 
Schedule of Allocation of Plan Assets [Table Text Block]
Pension Plan Assets – Fair Value Hierarchy            
             
 Fair Value Measurements Using: 
    Quoted Prices in Significant    
    Active Markets Other Significant 
 December 31 For Identical Observable Unobservable 
 2011 Assets Inputs Inputs 
In millionsFair Value (Level 1) (Level 2) (Level 3) 
Cash$ 2 $ 2       
Money market funds  137   135 $ 2    
US government and agency securities  395   114   281    
Corporate debt (a)  799      722 $ 77 
Common stock  933   933       
Preferred stock  13   9   2   2 
Mutual funds  37      37    
Interest in Collective Funds (b)  1,314      937   377 
Limited partnerships  130         130 
Other  45   2   16   27 
Total$ 3,805 $ 1,195 $ 1,997 $ 613 

              
  Fair Value Measurements Using: 
     Quoted Prices in Significant    
     Active Markets Other Significant 
  December 31 For Identical Observable Unobservable 
  2010 Assets Inputs Inputs 
In millionsFair Value (Level 1) (Level 2) (Level 3) 
Cash$ 5 $ 5       
Money market funds  108    $ 108    
US government and agency securities  518   267   251    
Corporate debt (a)  916   8   555 $ 353 
Common stock  1,153   652   501    
Preferred Stock  42      42    
Mutual funds  36      36    
Interest in Collective Funds (b)  1,016      646   370 
Limited partnerships  75         75 
Other  122   14   77   31 
Total$ 3,991 $ 946 $ 2,216 $ 829 
(a)Corporate debt includes $106 million and $175 million of non-agency mortgage-backed securities as of December 31, 2011 and 2010, respectively. 
(b)The benefit plans own commingled funds that invest in equity and fixed income securities. The commingled funds that invest in equity securities seek  
 to mirror the performance of the S&P 500 Index, Russell 3000 Index, Morgan Stanley Capital International ACWI X US Index, and the Dow Jones  
 U.S. Select Real Estate Securities Index. The commingled fund that holds fixed income securities invests in domestic investment grade securities  
 and seeks to mimic the performance of the Barclays Aggregate Bond Index. 
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]
Rollforward of Pension Plan Level 3 Assets               
               
  Interest in Common Collective Funds Corporate Debt  Limited Partnership  Other  Preferred Stock
In millions         
January 1, 2011$ 370 $ 353 $ 75 $ 31   
Net realized gain on sale of investments  (1)   (9)   (6)   3   
Net unrealized gain/(loss) on assets held at end of year  (19)   (12)   55   (4) $ (1)
Purchases  27   29   16   4   3
Sales     (184)   (10)   (7)   
Transfers into Level 3     30         
Transfers (from) Level 3     (130)         
December 31, 2011$ 377 $ 77 $ 130 $ 27 $ 2

   Interest in Common Collective Funds  Corporate Debt  Limited Partnerships  Other
In millions        
January 1, 2010 $ 57 $ 117 $ 62 $ 44
Net realized gain on sale of investments      37   6   4
Net unrealized gain/(loss) on assets held at end of year   99   (48)   3   (15)
Purchases, sales, issuances, and settlements (net)   214   214   4   1
Transfers into (from) Level 3      33      (3)
December 31, 2010 $ 370 $ 353 $ 75 $ 31
Estimated Cash Flows [Table Text Block]
Estimated Cash Flows           
             
         Postretirement Benefits   
            Reduction in PNC
            Benefit Payments
  Qualified Nonqualified Gross PNC  Due to Medicare
In millionsPension Pension Benefit Payments  Part D Subsidy
Estimated 2012 employer contributions   $ 30 $ 36 $ 2
Estimated future benefit payments           
 2012$ 251 $ 30 $ 36 $ 2
 2013  263   30   33   2
 2014  274   29   34   2
 2015  282   27   34   2
 2016  288   26   33   2
 2017-2021  1,578   108   156   8
Schedule of Net Benefit Costs [Table Text Block]
Components of Net Periodic Benefit Cost                          
                              
   Qualified Pension Plan Nonqualified Pension Plan Postretirement Benefits 
Year ended December 31 – in millions 2011  2010  2009  2011  2010  2009  2011  2010  2009 
Net periodic cost consists of:                           
Service cost$ 94 $ 102 $ 90 $ 4 $ 3 $ 2 $ 7 $ 5 $ 4 
Interest cost  196   203   206   13   14   15   19   20   21 
Expected return on plan assets  (298)   (285)   (260)                   
Amortization of prior service cost  (8)   (8)   (2)            (3)   (3)   (5) 
Amortization of actuarial losses  19   34   83   5   3   1          
Net periodic cost  3   46   117   22   20   18   23   22   20 
Other changes in plan assets and benefit                            
 obligations recognized in other                            
 comprehensive income:                           
Current year prior service cost/(credit)        (43)         2          
Amortization of prior service credit  8   8   2            3   3   5 
Current year actuarial loss/(gain)  579   (99)   (263)   15   11   24   (1)   21   21 
Amortization of actuarial (loss)  (19)   (34)   (83)   (5)   (3)   (1)   (1)       
 Total recognized in OCI  568   (125)   (387)   10   8   25   1   24   26 
 Total recognized in net periodic cost                            
  and OCI$ 571 $ (79) $ (270) $ 32 $ 28 $ 43 $ 24 $ 46 $ 46 
Schedule Of Net Benefit Costs Assumptions [Table Text Block]
Net Periodic Costs – Assumptions        
         
  Net Periodic Cost Determination 
Year ended December 312011 2010 2009  
Discount rate       
 Qualified pension 5.20% 5.75% 6.05% 
 Nonqualified pension 4.80  5.15  5.90  
 Postretirement benefits 5.00  5.40  5.95  
Rate of compensation increase (average) 4.00  4.00  4.00  
Assumed health care cost trend rate       
 Initial trend 8.00  8.50  9.00  
 Ultimate trend 5.00  5.00  5.00  
 Year ultimate reached2019 2014 2014  
Expected long-term return on plan assets 7.75  8.00  8.25  
Other Pension Assumptions [Table Text Block]
Other Pension Assumptions     
       
  At December 31 
Year ended December 312011 2010  
Discount rate     
 Qualified pension 4.60% 5.20% 
 Nonqualified pension 4.20  4.80  
 Postretirement benefits 4.40  5.00  
Rate of compensation increase (average) 4.00  4.00  
Assumed health care cost trend rate     
 Initial trend 8.00  8.00  
 Ultimate trend 5.00  5.00  
 Year ultimate reached2019 2019  
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]
Effect of One Percent Change in Assumed Health Care Cost      
      
Year ended December 31, 2011     
In millions Increase  Decrease
Effect on total service and interest cost$ 1 $ (1)
Effect on year-end benefit obligation$ 13 $ (13)
Estimated Amortization Of Unamortized Actuarial Gains And Losses [Table Text Block]
Estimated Amortization of Unamortized Actuarial Gains and Losses—2012         
 2012 Estimate 
Year ended December 31 Qualified  Nonqualified Postretirement 
In millions Pension  Pension Benefits 
Prior service (credit)$ (8)    $ (3) 
Net actuarial loss  88 $ 6   2 
Total$ 80 $ 6 $ (1)