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Revenue Revenue Contract Liabilities (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Revenue from Contract Liabilities [Abstract]        
Contract with Customer, Liability $ 377 $ 288 $ 392 $ 215
Deferred Revenue, Additions 300 216    
Contract with Customer, Liability, Revenue Recognized $ (315) $ (143)