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Basis of Presentation Basis of Presentation (Tables)
 3 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]  
Schedule of Changes in Allowances for Credit Losses
Changes in allowances for credit losses consisted of:
 
Allowance for Trade Receivables
 
Allowance for Other Current Receivables
 
Allowance for Long-Term Receivables
 
(in millions)
Balance at January 1, 2020
$
(35
)
 
$
(44
)
 
$
(14
)
Current period provision for expected credit losses
(5
)
 
1

 
(2
)
Currency
1

 
3

 
3

Balance at March 31, 2020
$
(39
)
 
$
(40
)
 
$
(13
)