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Equity-Based Compensation - Total Gross Unrecognized Estimated Compensation Expense and Expected Weighted-Average Periods (Detail) - Restricted Stock and RSUs [Member]
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
[1]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unrecognized estimated compensation expense for equity awards $ 27
Weighted-average period for expense recognition 1 year 8 months 12 days
[1] Excludes liability awards.