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Revenue, Contract Assets and Liabilities - Remaining Performance Obligation (Details)
$ in Billions
Mar. 31, 2019
USD ($)
Revenue from Contract with Customer [Abstract]  
Remaining performance obligation $ 2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation, percentage 65.00%
Remaining performance obligation, expected timing of satisfaction 2 years