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Revenue Recognition - Summary of Revenues Expected to be Recognized in Future Related to Performance Obligations (Detail)
$ in Millions
Jun. 30, 2020
USD ($)
Revenue from Contract with Customer [Abstract]  
Remaining performance obligations $ 1,109
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-07-01  
Revenue from Contract with Customer [Abstract]  
Remaining performance obligations $ 206
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, remaining performance obligation, expected timing of satisfaction, period 3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-10-01  
Revenue from Contract with Customer [Abstract]  
Remaining performance obligations $ 838
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, remaining performance obligation, expected timing of satisfaction, period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-10-01  
Revenue from Contract with Customer [Abstract]  
Remaining performance obligations $ 65
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, remaining performance obligation, expected timing of satisfaction, period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-10-01  
Revenue from Contract with Customer [Abstract]  
Remaining performance obligations $ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, remaining performance obligation, expected timing of satisfaction, period