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Per Common Share Information (Additional Information) (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Jul. 29, 2016
May 16, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]              
Dilutive effect of share-based compensation 6.3 4.5 7.1 4.8      
Stock options that were not included in diluted weighted-average shares 4.2 9.1 1.2 9.4      
Accelerated Share Repurchases, Settlement (Payment) or Receipt           $ 2,600.0  
Treasury Stock Shares Acquired Through Accelerated Share Repurchase         5.1 16.2  
Percent of total shares expected to receive at time of initial delivery           80.00%  
Dividends Payable, Amount Per Share $ 0.94   $ 0.94        
Dividends payable $ 772.9   $ 772.9       $ 0.0