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Earnings Per Common Share - Schedule of Computation of Basic and Diluted Earnings Per Common Share (Parenthetical) (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive options excluded from the computation of diluted earnings per share (in shares) 3 5 4 6
Minimum [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive options excluded from the computation of diluted earnings per share ,exercise price $ 70.96 $ 56.32 $ 70.96 $ 56.28
Maximum [Member]
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive options excluded from the computation of diluted earnings per share ,exercise price $ 88.81 $ 88.81 $ 88.81 $ 88.81