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Basis of Presentation - Changes in Allowances for Credit Losses (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2021
USD ($)
Allowance for Trade Receivables  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Balance at January 1, 2021 $ (42)
Current period provision for expected credit losses (2)
Write-offs charged against the allowance 1
Currency 3
Balance at March 31, 2021 (40)
Allowance for Other Current Receivables  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Balance at January 1, 2021 (42)
Current period provision for expected credit losses 0
Write-offs charged against the allowance 1
Currency 0
Balance at March 31, 2021 (41)
Allowance for Long-Term Receivables  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Balance at January 1, 2021 (12)
Current period provision for expected credit losses 0
Write-offs charged against the allowance 0
Currency 1
Balance at March 31, 2021 $ (11)