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Revenue Revenue Contract Liabilities (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Revenue from Contract Liabilities [Abstract]        
Contract with Customer, Liability $ 385 $ 379 $ 377 $ 394
Deferred Revenue, Additions 413 300    
Contract with Customer, Liability, Revenue Recognized $ (405) $ (315)