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Derivative Instruments (Tables)
 9 Months Ended
Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Derivatives Instruments in Statements of Financial Performance and Financial Position
The total estimated fair values of our foreign currency forward contracts and warrant derivative were as follows:
(Dollars in millions)
 
September 30, 2018
 
December 31, 2017
 
Classification
Derivative assets not designated as hedges:
 
 
 
 
 
 
Foreign currency forward contracts
 
$
3

 
$
5

 
Other Current Assets
 
 
 
 
 
 
 
Derivative liabilities not designated as hedges:
 
 
 
 
 
 
Foreign currency forward contracts
 
(2
)
 
(4
)
 
Other Current Liabilities
Warrant on Weatherford Shares
 
(3
)
 
(70
)
 
Other Current Liabilities


The amount of derivative instruments’ gain or (loss) on the Condensed Consolidated Statements of Operations is in the table below.
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
(Dollars in millions)
 
2018
 
2017
 
2018
2017
 
Classification
Foreign currency forward contracts
 
$
(5
)
 
$
2

 
$
(5
)
$
(20
)
 
Other Income (Expense), Net
Warrant on Weatherford Shares
 
11

 
(7
)
 
67

58

 
Warrant Fair Value Adjustment