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Credit Losses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Credit Loss [Abstract]          
Increase in allowance for doubtful accounts related to COVID-19 $ 0 $ 30 $ 0 $ 30 $ 0
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
January 1, 2020   $ 22   22  
Current-period provision for credit losses (a)       39  
Accounts Receivable, Allowance for Credit Loss, Writeoff       8  
Foreign currency impact       (1)  
June 30, 2020 $ 52     $ 52