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Revenue Revenue Contract Liabilities (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Revenue from Contract Liabilities [Abstract]        
Contract with Customer, Liability $ 349 $ 403 $ 392 $ 205
Deferred Revenue, Additions 448 409    
Contract with Customer, Liability, Revenue Recognized $ (491) $ (211)