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Intangible Assets
 3 Months Ended
Mar. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]  
Intangible Assets

7.   Intangible Assets

The gross book value, accumulated amortization and net book value of intangible assets were as follows:

 

 

(Stated in millions)

 

 

 

 

 

Mar. 31, 2018

 

 

Dec. 31, 2017

 

 

Gross

 

 

Accumulated

 

 

Net Book

 

 

Gross

 

 

Accumulated

 

 

Net Book

 

 

Book Value

 

 

Amortization

 

 

Value

 

 

Book Value

 

 

Amortization

 

 

Value

 

Customer relationships

$

4,833

 

 

$

1,079

 

 

$

3,754

 

 

$

4,832

 

 

$

1,020

 

 

$

3,812

 

Technology/technical know-how

 

3,619

 

 

 

1,127

 

 

 

2,492

 

 

 

3,634

 

 

 

1,078

 

 

 

2,556

 

Tradenames

 

2,806

 

 

 

558

 

 

 

2,248

 

 

 

2,806

 

 

 

533

 

 

 

2,273

 

Other

 

1,326

 

 

 

603

 

 

 

723

 

 

 

1,295

 

 

 

582

 

 

 

713

 

 

$

12,584

 

 

$

3,367

 

 

$

9,217

 

 

$

12,567

 

 

$

3,213

 

 

$

9,354

 

 

Amortization expense charged to income was $165 million during the first quarter of 2018 and $169 million during the fist quarter of 2017.

Based on the net book value of intangible assets at March 31, 2018, amortization charged to income for the subsequent five years is estimated to be: remaining three quarters of 2018—$519 million; 2019—$672 million; 2020—$640 million; 2021—$617 million; 2022—$607 million; and 2023—$594 million.