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Segment Information (Tables)
 9 Months Ended
Sep. 30, 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 Annual Report on Form 10-K.
 
Three Months Ended September 30, 2018
(Dollars in millions)
Revenues
 
Income (Loss)
from
Operations
 
Depreciation
and
Amortization
Western Hemisphere
$
762

 
$
78

 
$
46

Eastern Hemisphere
682

 
38

 
81

 
1,444

 
116

 
127

Corporate General and Administrative
 
 
(31
)
 
1

Restructuring and Transformation Charges
 
 
(27
)
 
 
Long-Lived Asset Impairments, Asset Write-Downs and Other (a)
 
 
(71
)
 
 
Total
$
1,444

 
$
(13
)
 
$
128


(a)
Includes long-lived asset impairments and other asset write-downs primarily related to deferred mobilization costs and other assets of the land drilling rigs business.


 
Three Months Ended September 30, 2017
(Dollars in millions)
Revenues
 
Income (Loss)
from
Operations
 
Depreciation
and
Amortization
Western Hemisphere
$
767

 
$
3

 
$
89

Eastern Hemisphere
693

 
(10
)
 
108

 
1,460

 
(7
)
 
197

Corporate General and Administrative
 
 
(28
)
 
2

Restructuring Charges
 
 
(34
)
 
 
Asset Write-Downs and Other
 
 
(1
)
 
 
Total
$
1,460

 
$
(70
)
 
$
199


 
Nine Months Ended September 30, 2018
(Dollars in millions)
Revenues
 
Income (Loss)
from
Operations
 
Depreciation
and
Amortization
Western Hemisphere
$
2,287

 
$
152

 
$
162

Eastern Hemisphere
2,028

 
73

 
251

 
4,315

 
225

 
413

Corporate General and Administrative
 
 
(101
)
 
6

Restructuring and Transformation Charges
 
 
(90
)
 
 
Long-Lived Asset Impairments, Asset Write-Downs and Other (b)
 
 
(159
)
 
 
Total
$
4,315

 
$
(125
)
 
$
419


(b)
Includes long-lived asset impairments and other asset write-downs primarily related to deferred mobilization costs and other assets of the land drilling rigs business, and inventory charges, partially offset by gains primarily from the purchase of a remaining interest in a joint venture and a reduction of a contingency reserve on a legacy contract.

 
Nine Months Ended September 30, 2017
(Dollars in millions)
Revenues
 
Loss
from
Operations
 
Depreciation
and
Amortization
Western Hemisphere
$
2,178

 
$
(78
)
 
$
272

Eastern Hemisphere
2,031

 
(91
)
 
334

 
4,209

 
(169
)
 
606

Corporate General and Administrative
 
 
(94
)
 
5

Restructuring Charges
 
 
(140
)
 
 
Asset Write-Downs and Other
 
 
(26
)
 
 
Total
$
4,209

 
$
(429
)
 
$
611