v3.19.3.a.u2
Capital Stock - Common and Preferred Shares Issued and Outstanding and Related Activity (Detail) - shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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 0 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 157,553,501 159,977,115 161,534,443
Shares repurchased (4,018,905) (3,511,603) (2,647,670)
Net issuance of common shares related to employee stock transactions 841,184 1,087,989 1,090,342
PNC LTIP capital contribution 0 0 0
Shares, ending balance 154,375,780 157,553,501 159,977,115
Treasury Stock Common [Member]      
Schedule of Capitalization, Equity [Line Items]      
Shares, beginning balance (13,698,684) (11,275,070) (9,717,742)
Shares repurchased (4,018,905) (3,511,603) (2,647,670)
Net issuance of common shares related to employee stock transactions 841,184 1,087,989 1,090,342
PNC LTIP capital contribution 0 0 0
Shares, ending balance (16,876,405) (13,698,684) (11,275,070)
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 0 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 0
Net issuance of common shares related to employee stock transactions 0 0 0
PNC LTIP capital contribution 0 0 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 143,458 246,522 763,660
Shares repurchased 0 0 0
Net issuance of common shares related to employee stock transactions 0 0 0
PNC LTIP capital contribution (143,458) (103,064) (517,138)
Shares, ending balance 0 143,458 246,522
Series C Nonvoting Participating Preferred Stock [Member] | Shares Outstanding [Member]      
Schedule of Capitalization, Equity [Line Items]      
Shares, beginning balance 143,458 246,522 763,660
Shares repurchased 0 0 0
Net issuance of common shares related to employee stock transactions 0 0 0
PNC LTIP capital contribution (143,458) (103,064) (517,138)
Shares, ending balance 0 143,458 246,522