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Basis of Presentation - Changes in Allowances for Credit Losses (Details)
$ in Millions
 9 Months Ended
Sep. 30, 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 (3)
Write-offs charged against the allowance 3
Currency 3
Balance at September 30, 2021 (39)
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 (13)
Write-offs charged against the allowance 1
Currency 1
Balance at September 30, 2021 (53)
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 2
Currency 1
Balance at September 30, 2021 $ (9)