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Goodwill and Intangible Assets - (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill
The changes in the carrying value of goodwill are detailed below by segment:
 
Oilfield Services
Oilfield Equipment
Turbo-machinery & Process Solutions
Digital Solutions
Total
Balance at December 31, 2015, gross
$
2,885

$
3,840

$
1,853

$
2,043

$
10,621

Accumulated impairment at December 31, 2015
(2,633
)
(867
)
—

(254
)
(3,754
)
Balance at December 31, 2015
252

2,973

1,853

1,789

6,867

Acquisitions and purchase accounting adjustments

19

(1
)

18

Currency exchange and others
(106
)
(7
)
(38
)
(54
)
(205
)
Balance at December 31, 2016
146

2,985

1,814

1,735

6,680

Acquisition (1)
13,052

—

—

—

13,052

Currency exchange and others
7

49

92

47

195

Balance at December 31, 2017
$
13,205

$
3,034

$
1,906

$
1,782

$
19,927

(1) 
Includes goodwill associated with the acquisition of Baker Hughes. This amount and its allocations to segments are preliminary.
Schedule of finite-lived intangible assets
Intangible assets are comprised of the following at December 31:
 
2017
2016
 
Gross
Carrying
Amount
Accumulated
Amortization
Net
Gross
Carrying
Amount
Accumulated
Amortization
Net
Technology
$
1,177

$
(440
)
$
737

$
596

$
(371
)
$
225

Customer relationships
3,202

(819
)
2,383

1,920

(660
)
1,260

Capitalized software
1,130

(697
)
433

896

(535
)
361

Trade names and trademarks
757

(159
)
598

681

(130
)
551

Other
10

—

10

1

(1
)
—

Finite-lived intangible assets
6,276

(2,115
)
4,161

4,094

(1,697
)
2,397

Indefinite-lived intangible assets (1)
2,197

—

2,197

52

—

52

Total intangible assets
$
8,473

$
(2,115
)
$
6,358

$
4,146

$
(1,697
)
$
2,449

(1) 
Indefinite-lived intangible assets principally comprise trade names and trademarks acquired in business combinations.
Schedule of indefinite-lived intangible assets
Intangible assets are comprised of the following at December 31:
 
2017
2016
 
Gross
Carrying
Amount
Accumulated
Amortization
Net
Gross
Carrying
Amount
Accumulated
Amortization
Net
Technology
$
1,177

$
(440
)
$
737

$
596

$
(371
)
$
225

Customer relationships
3,202

(819
)
2,383

1,920

(660
)
1,260

Capitalized software
1,130

(697
)
433

896

(535
)
361

Trade names and trademarks
757

(159
)
598

681

(130
)
551

Other
10

—

10

1

(1
)
—

Finite-lived intangible assets
6,276

(2,115
)
4,161

4,094

(1,697
)
2,397

Indefinite-lived intangible assets (1)
2,197

—

2,197

52

—

52

Total intangible assets
$
8,473

$
(2,115
)
$
6,358

$
4,146

$
(1,697
)
$
2,449

(1) 
Indefinite-lived intangible assets principally comprise trade names and trademarks acquired in business combinations.
Schedule of finite-lived intangible assets, future amortization expense
Estimated amortization expense for each of the subsequent five fiscal years is expected to be as follows:

Year
Estimated Amortization Expense
2018
$
432

2019
398

2020
372

2021
326

2022
293