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Fixed Assets
12 Months Ended
Dec. 31, 2018
Property Plant And Equipment [Abstract]  
Fixed Assets

6. Fixed Assets

Fixed assets consist of the following:

 

(Stated in millions)

 

 

 

 

 

 

 

 

 

 

2018

 

 

2017

 

Land

$

462

 

 

$

428

 

Buildings & improvements

 

5,534

 

 

 

5,122

 

Machinery & equipment

 

32,668

 

 

 

32,160

 

Seismic vessels

 

-

 

 

 

103

 

 

 

38,664

 

 

 

37,813

 

Less: Accumulated depreciation

 

26,985

 

 

 

26,237

 

 

$

11,679

 

 

$

11,576

 

 

The estimated useful lives of Buildings & improvements are primarily 25 to 30 years. The estimated useful lives of Machinery & equipment are primarily 5 to 10 years.

Depreciation expense, which is recorded on a straight-line basis, was $2.1 billion, $2.3 billion and $2.7 billion in 2018, 2017 and 2016, respectively.