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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2018
Segment Reporting [Abstract]  
Financial information by segment
Financial information by segment is summarized below. Revenues are attributable to countries based on the ultimate destination of the sale of products or performance of services. The accounting policies of the segments are the same as those described in the summary of significant accounting policies as presented in our Form 10-K.
 
Three Months Ended March 31, 2018
(Dollars in millions)
Revenues
 
Income (Loss)
from
Operations
 
Depreciation
and
Amortization
Western Hemisphere
$
756

 
$
24

 
$
60

Eastern Hemisphere
667

 
16

 
86

 
1,423

 
40

 
146

Corporate General and Administrative
 
 
(36
)
 
1

Restructuring and Transformation Charges
 
 
(25
)
 
 
Asset Write-Downs and Other (a)
 
 
 
(18
)
 
 
Total
$
1,423

 
$
(39
)
 
$
147


(a)
Includes asset write-downs and inventory charges, partially offset by gain on purchase of the remaining interest in a joint venture.


 
Three Months Ended March 31, 2017
(Dollars in millions)
Revenues
 
Loss
from
Operations
 
Depreciation
and
Amortization
Western Hemisphere
$
733

 
$
(30
)
 
$
91

Eastern Hemisphere
653

 
(59
)
 
115

 
1,386

 
(89
)
 
206

Corporate General and Administrative
 
 
(33
)
 
2

Restructuring Charges
 
 
(75
)
 
 
Asset Write-Downs and Other (b)
 
 
(17
)
 
 
Total
$
1,386

 
$
(214
)
 
$
208

(b)
Includes asset write-downs and inventory charges.