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 | ||
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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]
|
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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]
|
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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 |