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Earnings Per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount 16us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 1us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount