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Per Common Share Information (Additional Information) (Detail) - USD ($)
shares in Millions, $ in Billions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Feb. 12, 2016
Earnings Per Share [Abstract]      
Dilutive effect of share-based compensation 6.0 4.9  
Stock options that were not included in diluted weighted-average shares 4.2 12.7  
Accelerated Share Repurchases, Settlement (Payment) or Receipt     $ 2.7
Treasury Stock Shares Acquired Through Accelerated Share Repurchase     18.5
Percent of total shares expected to receive at time of initial delivery     80.00%