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Basis of Presentation Basis of Presentation (Tables)
9 Months Ended
Sep. 30, 2021
Accounting Policies [Abstract]  
Schedule of Changes in Allowances for Credit Losses
Changes in allowances for credit losses consisted of:
Allowance for Trade ReceivablesAllowance for Other Current ReceivablesAllowance for Long-Term Receivables
 (in millions)
Balance at January 1, 2021$(42)$(42)$(12)
Current period provision for expected credit losses(3)(13)— 
Write-offs charged against the allowance
Currency
Balance at September 30, 2021$(39)$(53)$(9)