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Stock Based Compensation - Additional Information (Detail) (USD $)
In Billions, except Share data in Millions, unless otherwise specified |
6 Months Ended |
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Jun. 30, 2014
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Maximum number of shares available for awards under the Long-Term Incentive Plan | 119.6 |
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Restricted Stock Units and Performance Stock Units
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Unrecognized compensation expense related to the unvested portion of RSUs and PSUs | $ 0.6 |
| Weighted-average period of unrecognized compensation expense related to the unvested portion of RSUs and PSUs (in years) | 2 years |
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Restricted Stock Units
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Weighted average grant date fair value per unit | $ 47.15 |