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Revenue (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue recognized related to contract liabilities $ 1
Transferred over Time  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue recognized 5,765
Transferred at Point in Time  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue recognized $ 5,386