v3.22.0.1
Capital Stock - Common and Preferred Shares Issued and Outstanding and Related Activity (Detail) - shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Common Stock [Member]      
Schedule of Capitalization, Equity [Line Items]      
Shares, beginning balance 172,075,373 171,252,185 171,252,185
Shares repurchased 0 0 0
Net issuance of common shares related to employee stock transactions 0 0 0
PNC LTIP capital contribution     0
Exchange of preferred shares series B for common shares   823,188  
Shares, ending balance 172,075,373 172,075,373 171,252,185
Common Stock [Member] | Shares Outstanding [Member]      
Schedule of Capitalization, Equity [Line Items]      
Shares, beginning balance 152,532,885 154,375,780 157,553,501
Shares repurchased (1,421,994) (3,445,554) (4,018,905)
Net issuance of common shares related to employee stock transactions 573,600 779,471 841,184
PNC LTIP capital contribution     0
Exchange of preferred shares series B for common shares   823,188  
Shares, ending balance 151,684,491 152,532,885 154,375,780
Treasury Stock Common [Member]      
Schedule of Capitalization, Equity [Line Items]      
Shares, beginning balance (19,542,488) (16,876,405) (13,698,684)
Shares repurchased (1,421,994) (3,445,554) (4,018,905)
Net issuance of common shares related to employee stock transactions 573,600 779,471 841,184
PNC LTIP capital contribution     0
Exchange of preferred shares series B for common shares   0  
Shares, ending balance (20,390,882) (19,542,488) (16,876,405)
Series B Nonvoting Participating Preferred Stock [Member]      
Schedule of Capitalization, Equity [Line Items]      
Shares, beginning balance 0 823,188 823,188
Shares repurchased 0 0 0
Net issuance of common shares related to employee stock transactions 0 0 0
PNC LTIP capital contribution     0
Exchange of preferred shares series B for common shares   (823,188)  
Shares, ending balance 0 0 823,188
Series B Nonvoting Participating Preferred Stock [Member] | Shares Outstanding [Member]      
Schedule of Capitalization, Equity [Line Items]      
Shares, beginning balance 0 823,188 823,188
Shares repurchased 0 0 0
Net issuance of common shares related to employee stock transactions 0 0 0
PNC LTIP capital contribution     0
Exchange of preferred shares series B for common shares   (823,188)  
Shares, ending balance 0 0 823,188
Series C Nonvoting Participating Preferred Stock [Member]      
Schedule of Capitalization, Equity [Line Items]      
Shares, beginning balance 0 0 143,458
Shares repurchased 0 0 0
Net issuance of common shares related to employee stock transactions 0 0 0
PNC LTIP capital contribution     (143,458)
Exchange of preferred shares series B for common shares   0  
Shares, ending balance 0 0 0
Series C Nonvoting Participating Preferred Stock [Member] | Shares Outstanding [Member]      
Schedule of Capitalization, Equity [Line Items]      
Shares, beginning balance 0 0 143,458
Shares repurchased 0 0 0
Net issuance of common shares related to employee stock transactions 0 0 0
PNC LTIP capital contribution     (143,458)
Exchange of preferred shares series B for common shares   0  
Shares, ending balance 0 0 0