v3.3.1.900
Capital Stock - Common and Preferred Shares Issued and Outstanding and Related Activity (Detail) - shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Treasury Stock Common [Member]      
Schedule of Capitalization, Equity [Line Items]      
Shares, beginning balance (6,465,397) (4,662,497) (2,376,881)
Shares repurchased (3,080,689) (3,175,088) (3,689,845)
Net issuance of common shares related to employee stock transactions 1,754,965 1,372,188 1,404,229
PNC LTIP capital contribution     0
Shares, ending balance (7,791,121) (6,465,397) (4,662,497)
Common Stock [Member]      
Schedule of Capitalization, Equity [Line Items]      
Shares, beginning balance 171,252,185 171,252,185 171,252,185
Shares repurchased 0 0 0
Net issuance of common shares related to employee stock transactions 0 0 0
PNC LTIP capital contribution     0
Shares, ending balance 171,252,185 171,252,185 171,252,185
Common Stock [Member] | Shares Outstanding [Member]      
Schedule of Capitalization, Equity [Line Items]      
Shares, beginning balance 164,786,788 166,589,688 168,875,304
Shares repurchased (3,080,689) (3,175,088) (3,689,845)
Net issuance of common shares related to employee stock transactions 1,754,965 1,372,188 1,404,229
PNC LTIP capital contribution     0
Shares, ending balance 163,461,064 164,786,788 166,589,688
Series B Nonvoting Participating Preferred Stock [Member]      
Schedule of Capitalization, Equity [Line Items]      
Shares, beginning balance 823,188 823,188 823,188
Shares repurchased 0 0 0
Net issuance of common shares related to employee stock transactions 0 0 0
PNC LTIP capital contribution     0
Shares, ending balance 823,188 823,188 823,188
Series B Nonvoting Participating Preferred Stock [Member] | Shares Outstanding [Member]      
Schedule of Capitalization, Equity [Line Items]      
Shares, beginning balance 823,188 823,188 823,188
Shares repurchased   0 0
Net issuance of common shares related to employee stock transactions   0 0
PNC LTIP capital contribution     0
Shares, ending balance 823,188 823,188 823,188
Series C Nonvoting Participating Preferred Stock [Member]      
Schedule of Capitalization, Equity [Line Items]      
Shares, beginning balance 1,311,887 1,311,887 1,517,237
Shares repurchased 0 0 0
Net issuance of common shares related to employee stock transactions 0 0 0
PNC LTIP capital contribution     (205,350)
Shares, ending balance 1,311,887 1,311,887 1,311,887
Series C Nonvoting Participating Preferred Stock [Member] | Shares Outstanding [Member]      
Schedule of Capitalization, Equity [Line Items]      
Shares, beginning balance 1,311,887 1,311,887 1,517,237
Shares repurchased   0 0
Net issuance of common shares related to employee stock transactions   0 0
PNC LTIP capital contribution     (205,350)
Shares, ending balance 1,311,887 1,311,887 1,311,887