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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Fair Values of Outstanding Derivative Instruments
The total estimated fair values of our foreign currency forward contracts and warrant derivative are as follows:
 
December 31,
 
 
(Dollars in millions)
2017
 
2016
 
Classifications
Derivative Assets not Designated as Hedges:
 
 
 
 
 
Foreign Currency Forward Contracts
$
5

 
$
7

 
Other Current Assets
 
 
 
 
 
 
Derivative Liabilities not Designated as Hedges:
 
 
 
 
 
Foreign Currency Forward Contracts
(4
)
 
(14
)
 
Other Current Liabilities
Warrant on Weatherford Shares
(70
)
 
(156
)
 
Other Non-current Liabilities


The amount of derivative instruments’ gain or (loss) on the Consolidated Statements of Operations is in the table below.
 
 
 
 
 
 
 

 
 
Year Ended December 31,
 
 
(Dollars in millions)
 
 
2017
 
2016
 
2015
 
Classification
Foreign Currency Forward Contracts
 
 
$
(25
)
 
$
(25
)
 
$
(115
)
 
Other Income (Expense), Net
Cross-currency Swap Contracts
 
 
—

 
—

 
13

 
Other Income (Expense), Net
Warrant on Weatherford Shares
 
 
86

 
16

 
—

 
Warrant Fair Value Adjustment