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Revenue Revenue Contract Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2020
Dec. 31, 2018
Sep. 30, 2018
Revenue from Contract Liabilities [Abstract]        
Contract with Customer, Liability   $ 353 $ 394 $ 380
Deferred Revenue, Additions $ 148      
Contract with Customer, Liability, Revenue Recognized $ (162)