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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]  
Identified Intangible Assets Identified by Segment

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Identified Intangible Assets by Major Classification

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Goodwill Identified by Segment

Goodwill is identified by segment as follows (in millions):

 

 

 

Wellbore Technologies

 

 

Completion & Production Solutions

 

 

Rig Technologies

 

 

Total

 

Balance at December 31, 2016

 

$

2,874

 

 

$

2,058

 

 

$

1,135

 

 

$

6,067

 

Goodwill acquired and adjusted during period

 

 

37

 

 

 

41

 

 

 

11

 

 

 

89

 

Currency translation adjustments

 

 

45

 

 

 

23

 

 

 

3

 

 

 

71

 

Balance at December 31, 2017

 

$

2,956

 

 

$

2,122

 

 

$

1,149

 

 

$

6,227

 

Goodwill acquired and adjusted during period

 

 

64

 

 

 

(33

)

 

 

71

 

 

 

102

 

Currency translation adjustments

 

 

(9

)

 

 

(48

)

 

 

(8

)

 

 

(65

)

Balance at December 31, 2018 (1)

 

$

3,011

 

 

$

2,041

 

 

$

1,212

 

 

$

6,264

 

 

(1)

Accumulated goodwill impairment was $2,457 million as of December 31, 2018.