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Fair Value (Reconciliation of Recurring Fair Value Measurements) (Details) (USD $)
In Millions
 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2010
Residential Mortgage-backed Agency [Member]
Jun. 30, 2011
Residential Mortgage-backed Non-agency [Member]
Jun. 30, 2010
Residential Mortgage-backed Non-agency [Member]
Jun. 30, 2011
Residential Mortgage-backed Non-agency [Member]
Jun. 30, 2010
Residential Mortgage-backed Non-agency [Member]
Jun. 30, 2010
Commercial Mortgage-backed Non-agency [Member]
Jun. 30, 2010
Commercial Mortgage-backed Non-agency [Member]
Jun. 30, 2011
Asset backed [Member]
Jun. 30, 2010
Asset backed [Member]
Jun. 30, 2011
Asset backed [Member]
Jun. 30, 2010
Asset backed [Member]
Jun. 30, 2011
State and Municipal [Member]
Jun. 30, 2010
State and Municipal [Member]
Jun. 30, 2011
State and Municipal [Member]
Jun. 30, 2010
State and Municipal [Member]
Jun. 30, 2011
Other Debt Securities [Member]
Jun. 30, 2010
Other Debt Securities [Member]
Jun. 30, 2011
Other Debt Securities [Member]
Jun. 30, 2010
Other Debt Securities [Member]
Jun. 30, 2011
Corporate Stocks and Other [Member]
Jun. 30, 2011
Corporate Stocks and Other [Member]
Jun. 30, 2010
Corporate Stocks and Other [Member]
Mar. 31, 2010
Corporate Stocks and Other [Member]
Jun. 30, 2011
Total Securities Available for Sale [Member]
Jun. 30, 2010
Total Securities Available for Sale [Member]
Jun. 30, 2011
Total Securities Available for Sale [Member]
Jun. 30, 2010
Total Securities Available for Sale [Member]
Jun. 30, 2011
Financial Derivatives [Member]
Jun. 30, 2010
Financial Derivatives [Member]
Jun. 30, 2011
Financial Derivatives [Member]
Jun. 30, 2010
Financial Derivatives [Member]
Jun. 30, 2011
Trading Securities - Debt [Member]
Jun. 30, 2010
Trading Securities - Debt [Member]
Jun. 30, 2011
Trading Securities - Debt [Member]
Jun. 30, 2010
Trading Securities - Debt [Member]
Jun. 30, 2011
Residential Mortgage Servicing Rights [Member]
Jun. 30, 2010
Residential Mortgage Servicing Rights [Member]
Jun. 30, 2011
Residential Mortgage Servicing Rights [Member]
Jun. 30, 2010
Residential Mortgage Servicing Rights [Member]
Jun. 30, 2011
Commercial Mortgage Loans Held for Sale [Member]
Jun. 30, 2010
Commercial Mortgage Loans Held for Sale [Member]
Jun. 30, 2011
Commercial Mortgage Loans Held for Sale [Member]
Jun. 30, 2010
Commercial Mortgage Loans Held for Sale [Member]
Jun. 30, 2011
Equity Investments-Direct Investments [Member]
Jun. 30, 2010
Equity Investments-Direct Investments [Member]
Jun. 30, 2011
Equity Investments-Direct Investments [Member]
Jun. 30, 2010
Equity Investments-Direct Investments [Member]
Jun. 30, 2011
Equity Investments-Indirect Investments [Member]
Jun. 30, 2010
Equity Investments-Indirect Investments [Member]
Jun. 30, 2011
Equity Investments-Indirect Investments [Member]
Jun. 30, 2010
Equity Investments-Indirect Investments [Member]
Jun. 30, 2011
Total Equity Investments [Member]
Jun. 30, 2010
Total Equity Investments [Member]
Jun. 30, 2011
Total Equity Investments [Member]
Jun. 30, 2010
Total Equity Investments [Member]
Jun. 30, 2011
Other Assets - BlackRock Series C Preferred Stock [Member]
Jun. 30, 2010
Other Assets - BlackRock Series C Preferred Stock [Member]
Jun. 30, 2011
Other Assets - BlackRock Series C Preferred Stock [Member]
Jun. 30, 2010
Other Assets - BlackRock Series C Preferred Stock [Member]
Jun. 30, 2011
Level Three Loans [Member]
Jun. 30, 2011
Level Three Loans [Member]
Jun. 30, 2010
Other Assets Other [Member]
Jun. 30, 2011
Other Assets Other [Member]
Jun. 30, 2010
Other Assets Other [Member]
Mar. 31, 2011
Other Assets Other [Member]
Jun. 30, 2011
Other Assets [Member]
Jun. 30, 2010
Other Assets [Member]
Jun. 30, 2011
Other Assets [Member]
Jun. 30, 2010
Other Assets [Member]
Jun. 30, 2011
Total Assets [Member]
Jun. 30, 2010
Total Assets [Member]
Jun. 30, 2011
Total Assets [Member]
Jun. 30, 2010
Total Assets [Member]
Jun. 30, 2011
Total Liabilities [Member]
Jun. 30, 2010
Total Liabilities [Member]
Jun. 30, 2011
Total Liabilities [Member]
Jun. 30, 2010
Total Liabilities [Member]
Beginning Balance $ 5 [1] $ 7,171 [1] $ 7,710 [1] $ 7,233 [1] $ 8,302 [1] $ 3 [1] $ 6 [1] $ 1,024 [1] $ 1,187 [1] $ 1,045 [1] $ 1,254 [1] $ 341 [1] $ 272 [1] $ 228 [1] $ 266 [1] $ 73 [1] $ 83 [1] $ 73 [1] $ 53 [1] $ 1 [1] $ 4 [1] $ 47 [1] $ 47 [1] $ 8,610 [1] $ 9,302 [1] $ 8,583 [1] $ 9,933 [1] $ 50 [1] $ 86 [1] $ 77 [1] $ 50 [1] $ 60 [1] $ 77 [1] $ 69 [1] $ 89 [1] $ 1,109 [1] $ 1,271 [1] $ 1,033 [1] $ 1,332 [1] $ 858 [1] $ 1,041 [1] $ 877 [1] $ 1,050 [1] $ 794 [1] $ 602 [1] $ 749 [1] $ 595 [1] $ 663 [1] $ 606 [1] $ 635 [1] $ 593 [1] $ 1,457 [1] $ 1,208 [1] $ 1,384 [1] $ 1,188 [1] $ 447 [1] $ 452 [1] $ 396 [1] $ 486 [1] $ 2 [1] $ 2 [1] $ 9 [1] $ 7 [1] $ 23 [1] $ 8 [1] $ 455 [1] $ 461 [1] $ 403 [1] $ 509 [1] $ 12,601 [1] $ 13,446 [1] $ 12,428 [1] $ 14,151 [1] $ 476 [1],[2] $ 494 [1],[2] $ 460 [1],[2] $ 506 [1],[2]
Included in earnings   (58) [1] (46) [1] (64) [1] (115) [1]       (10) [1] (3) [1] (53) [1]   5 [1]   5 [1] (1) [1]   (2) [1]           (59) [1] (51) [1] (69) [1] (163) [1] 63 [1] 6 [1] 106 [1] 42 [1] 1 [1] 1 [1] (3) [1] (3) [1] (107) [1] (288) [1] (71) [1] (323) [1] 6 [1] 13 [1] (1) [1] 22 [1] 21 [1] 63 [1] 34 [1] 88 [1] 27 [1] 24 [1] 71 [1] 41 [1] 48 [1] 87 [1] 105 [1] 129 [1] (21) [1] (154) [1] 30 [1] (184) [1]             (21) [1] (154) [1] 30 [1] (184) [1] (69) [1] (386) [1] 97 [1] (480) [1] (14) [1],[2] (159) [1],[2] 50 [1],[2] (173) [1],[2]
Included in other comprehensive income   (73) [1] 395 [1] 182 [1] 680 [1]     (11) [1] 61 [1] 43 [1] 118 [1] 1 [1] (11) [1] 3 [1] (17) [1] 2 [1] 1 [1] 4 [1] 4 [1]     (1) [1]   (81) [1] 446 [1] 232 [1] 784 [1]                                                                     (1) [1]   (4) [1]     (1) [1]   (4) [1] (81) [1] 445 [1] 232 [1] 780 [1]        
Purchases   3 [1]   45 [1]               5 [1]   121 [1]   2 [1]   2 [1]           10 [1]   168 [1]   3 [1]   3 [1]               48 [1]           55 [1]   102 [1]   14 [1]   24 [1]   69 [1]   126 [1]           2 [1] 2 [1]   1 [1]         1 [1]   84 [1]   348 [1]          
Sales   (280) [1]   (280) [1]                       (2) [1]   (3) [1]           (282) [1]   (283) [1]                           (6) [1]   (13) [1]   (21) [1]   (36) [1]   (40) [1]   (66) [1]   (61) [1]   (102) [1]                               (349) [1]   (398) [1]   5 [1],[2]   8 [1],[2]  
Issuances                                                                       31 [1]   70 [1]                                                               31 [1]   70 [1]          
Settlements   (309) [1]   (662) [1]       (62) [1]   (134) [1]   (6) [1]   (11) [1]   1 [1]   1 [1]   (1) [1] (4) [1]     (377) [1]   (810) [1]   (56) [1]   (126) [1]   (5) [1]   (10) [1]   (37) [1]   (84) [1]   (2) [1]   (7) [1]                                                       (477) [1]   (1,037) [1]   (23) [1],[2]   (74) [1],[2]  
Purchases, issuances and settlements, net (5) [1]   (422) [1]   (1,230) [1]       (88) [1]   (169) [1]   (29) [1]   (18) [1]   (2) [1]   (4) [1]     1 [1]     (541) [1]   (1,425) [1]   (7) [1]   (7) [1]   (5) [1]   (13) [1]   (20) [1]   (46) [1]   (18) [1]   (36) [1]   (15) [1]   (33) [1]   (12) [1]   (16) [1]   (27) [1]   (49) [1]       (4) [1]     (1) [1]   (12) [1]     (1) [1]   (16) [1]   (619) [1]   (1,592) [1]   19 [1],[2]   21 [1],[2]
Transfers into Level 3             2 [1],[3]               1 [1],[3]       29 [1],[3]               32 [1],[3]                                                                                           32 [1],[3]   1 [1],[2]   1 [1],[3]
Transfers out of Level 3     (2) [1],[3]   (2) [1],[3] (3) [1],[3] (8) [1],[3]                                   (5) [1],[3]   (10) [1],[3]                                                                                       (5) [1],[3]   (10) [1],[3]        
Ending Balance   6,454 [1] 7,635 [1] 6,454 [1] 7,635 [1] 0 [1] 0 [1] 951 [1] 1,150 [1] 951 [1] 1,150 [1] 341 [1] 237 [1] 341 [1] 237 [1] 75 [1] 82 [1] 75 [1] 82 [1] 0 [1] 0 [1] 47 [1] 47 [1] 7,821 [1] 9,151 [1] 7,821 [1] 9,151 [1] 60 [1] 85 [1] 60 [1] 85 [1] 56 [1] 73 [1] 56 [1] 73 [1] 996 [1] 963 [1] 996 [1] 963 [1] 856 [1] 1,036 [1] 856 [1] 1,036 [1] 849 [1] 650 [1] 849 [1] 650 [1] 664 [1] 618 [1] 664 [1] 618 [1] 1,513 [1] 1,268 [1] 1,513 [1] 1,268 [1] 426 [1] 298 [1] 426 [1] 298 [1] 4 [1] 4 [1] 7 [1] 8 [1] 7 [1] 8 [1] 434 [1] 305 [1] 434 [1] 305 [1] 11,740 [1] 12,881 [1] 11,740 [1] 12,881 [1] 444 [1],[2] 355 [1],[2] 444 [1],[2] 355 [1],[2]
Attributable to unrealized gains or losses related to assets and liabilities held at reporting date   $ (35) [1] $ (81) [1] $ (63) [1] $ (154) [1]     $ (4) [1] $ (10) [1] $ (9) [1] $ (53) [1]             $ (1) [1]           $ (39) [1] $ (91) [1] $ (73) [1] $ (207) [1] $ 63 [1] $ 58 [1] $ 90 [1] $ 76 [1]     $ (5) [1] $ (4) [1] $ (105) [1] $ (291) [1] $ (70) [1] $ (324) [1] $ 5 [1] $ 14 [1] $ (1) [1] $ 20 [1] $ 20 [1] $ 58 [1] $ 31 [1] $ 73 [1] $ 29 [1] $ 22 [1] $ 71 [1] $ 33 [1] $ 49 [1] $ 80 [1] $ 102 [1] $ 106 [1] $ (21) [1]   $ 30 [1]               $ (21) [1]   $ 30 [1]   $ (48) [1] $ (230) [1] $ 73 [1] $ (333) [1] $ (18) [1],[2] $ 50 [1],[2] $ 34 [1],[2] $ 48 [1],[2]
[1] Losses for assets are bracketed while losses for liabilities are not.
[2] Financial derivatives.
[3] PNC’s policy is to recognize transfers in and transfers out as of the end of the reporting period.