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Revenue Recognition - Performance obligations (Details)
$ in Billions
Sep. 30, 2019
USD ($)
Revenue, remaining performance obligations  
Performance obligation $ 23.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01  
Revenue, remaining performance obligations  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Deprecated 2018-01-31) 12 months
Performance obligation, percent to be satisfied 60.00%