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Revenue Recognition - Allowance for Doubtful Accounts by Operating Segment (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2020
USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Balance at beginning of period $ 132
Charged to Earnings 34
Write-offs (16)
Foreign Currency (6)
Balance at end of period 144
Allowance for credit loss 144
Prepaid Expenses and Other Assets  
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Balance at beginning of period 48
Balance at end of period 45
Allowance for credit loss 48
North America  
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Balance at beginning of period 4
Charged to Earnings 5
Write-offs 0
Foreign Currency 0
Balance at end of period 9
Allowance for credit loss 9
EMEA  
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Balance at beginning of period 83
Charged to Earnings 5
Write-offs (13)
Foreign Currency 0
Balance at end of period 75
Allowance for credit loss 75
Latin America  
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Balance at beginning of period 33
Charged to Earnings 13
Write-offs (3)
Foreign Currency (6)
Balance at end of period 37
Allowance for credit loss 37
Asia  
Financing Receivable, Allowance for Credit Loss [Roll Forward]  
Balance at beginning of period 12
Charged to Earnings 11
Write-offs 0
Foreign Currency 0
Balance at end of period 23
Allowance for credit loss $ 23