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Revenue from Contracts with Customers - Transaction Price Allocated to the Remaining Performance Obligations (Details)
$ in Millions
Mar. 31, 2020
USD ($)
Revenue from Contract with Customer [Abstract]  
Revenue, remaining performance obligation $ 2,661
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01  
Revenue from Contract with Customer [Abstract]  
Revenue, remaining performance obligation $ 1,434
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, remaining performance obligation, period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01  
Revenue from Contract with Customer [Abstract]  
Revenue, remaining performance obligation $ 1,227
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, remaining performance obligation, period