v3.3.1.900
Stock-Based Compensation - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Jan. 31, 2016
shares
Jan. 31, 2015
shares
Dec. 31, 2015
USD ($)
Tranche
$ / shares
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock shares authorized for issuance under Award Plan     34,500,000    
Number of shares remaining for future awards     7,621,046    
Fair market value of RSUs/restricted stock granted to employees | $     $ 473,000,000 $ 472,000,000 $ 390,000,000
Fair market value of RSUs/restricted stock converted to common stock | $     $ 379,000,000 534,000,000 528,000,000
Stock price | $ / shares     $ 340.52    
Restricted Stock and RSUs, Granted     1,377,263    
Stock options contractual term, years     10 years    
Aggregate intrinsic value of options exercised | $     $ 128,000,000 $ 4,000,000 $ 19,000,000
Aggregate intrinsic value of exercisable shares | $     $ 27,000,000    
Remaining weighted-average period     1 year    
Employee stock purchase plan, purchase price percentage     95.00%    
Unvested Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized stock-based compensation expense | $     $ 0    
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Intrinsic value of outstanding RSUs | $     $ 1,000,000,000    
Stock price | $ / shares     $ 340.52    
Restricted Stock and RSUs, Granted     120,935 166,018 117,339
Unrecognized stock-based compensation expense | $     $ 305,000,000    
Remaining weighted-average period     10 months 24 days    
RSUs/Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock units vesting period, years     3 years 3 years 3 years
Awards to employees cliff vesting     303,999 287,963 370,812
RSUs to employees that cliff vest, percentage     100.00% 100.00% 100.00%
RSUs to employees that cliff vest, date     Jan. 31, 2018 Jan. 31, 2017 Jan. 31, 2016
RSUs/Restricted Stock [Member] | Subsequent Event [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock units vesting period, years 3 years        
Restricted Stock and RSUs, Granted 1,030,964        
Awards to employees cliff vesting 303,587        
RSUs to employees that cliff vest, percentage 100.00%        
RSUs to employees that cliff vest, date Jan. 31, 2019        
Market Performance-based RSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock units vesting period, years     6 years 6 years 6 years
Intrinsic value of outstanding RSUs | $     $ 469,000,000    
Stock price | $ / shares     $ 340.52    
Restricted Stock and RSUs, Granted     0 315,961 556,581
Unrecognized stock-based compensation expense | $     $ 47,000,000    
Remaining weighted-average period     10 months 24 days    
Share price appreciation targets     15.00% 25.00% 35.00%
Number of tranches | Tranche     3    
Service period of awards     4 years    
Grant date fair value | $       $ 62,000,000 $ 71,000,000
Performance-Based RSUs [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock units vesting period, years   3 years      
Intrinsic value of outstanding RSUs | $     $ 87,000,000    
Stock price | $ / shares     $ 340.52    
Restricted Stock and RSUs, Granted     262,847    
Unrecognized stock-based compensation expense | $     $ 59,000,000    
Remaining weighted-average period     2 years 1 month 6 days    
Awards to employees cliff vesting   262,847      
RSUs to employees that cliff vest, percentage   100.00%      
RSUs to employees that cliff vest, date     Jan. 31, 2018    
Grant-date fair market value expected to vest | $     $ 90,000,000    
Performance-Based RSUs [Member] | Subsequent Event [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock units vesting period, years 3 years        
Restricted Stock and RSUs, Granted 375,242        
Awards to employees cliff vesting 375,242        
RSUs to employees that cliff vest, percentage 100.00%        
RSUs to employees that cliff vest, date Jan. 31, 2019        
Long-Term Incentive Plans Funded by PNC [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of additional shares surrendered     2,700,000    
Remaining shares committed by PNC for long-term incentive awards     1,300,000    
Long-Term Incentive Plans Funded by PNC [Member] | Subsequent Event [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of additional shares surrendered 548,277        
Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock units vesting period, years     1 year    
Minimum [Member] | Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock units vesting period, years     2 years    
Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock units vesting period, years     3 years    
Maximum [Member] | Long-Term Incentive Plans Funded by PNC [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares committed to fund long-term incentive plans     4,000,000    
Maximum [Member] | Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock units vesting period, years     5 years