Stock Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Billions |
3 Months Ended |
|---|---|
|
Mar. 31, 2017
USD ($)
Installment
$ / shares
shares
| |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Maximum number of shares available for awards under the Long-Term Incentive Plan | shares | 119,600,000 |
| Restricted Stock Units and Performance Stock Units | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Unrecognized compensation expense related to the unvested portion of RSUs and PSUs | $ | $ 0.7 |
| Weighted-average period of unrecognized compensation expense related to the unvested portion of RSUs and PSUs (in years) | 2 years |
| Restricted Stock Units | |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Number of equal vesting installments | Installment | 3 |
| Weighted average grant date fair value per unit | $ / shares | $ 50.09 |