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Intangible Assets
 3 Months Ended
Mar. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]  
Intangible Assets

8.   Intangible Assets

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

 

 

(Stated in millions)

 

 

 

 

 

Mar. 31, 2017

 

 

Dec. 31, 2016

 

 

Gross

 

 

Accumulated

 

 

Net Book

 

 

Gross

 

 

Accumulated

 

 

Net Book

 

 

Book Value

 

 

Amortization

 

 

Value

 

 

Book Value

 

 

Amortization

 

 

Value

 

Customer relationships

$

4,960

 

 

$

927

 

 

$

4,033

 

 

$

4,938

 

 

$

865

 

 

$

4,073

 

Technology/technical know-how

 

3,655

 

 

 

896

 

 

 

2,759

 

 

 

3,655

 

 

 

835

 

 

 

2,820

 

Tradenames

 

2,847

 

 

 

484

 

 

 

2,363

 

 

 

2,847

 

 

 

458

 

 

 

2,389

 

Other

 

1,166

 

 

 

578

 

 

 

588

 

 

 

1,122

 

 

 

549

 

 

 

573

 

 

$

12,628

 

 

$

2,885

 

 

$

9,743

 

 

$

12,562

 

 

$

2,707

 

 

$

9,855

 

 

Amortization expense charged to income was $169 million during the first quarter of 2017 and $89 million during the first quarter of 2016.

Based on the net book value of intangible assets at March 31, 2017, amortization charged to income for the subsequent five years is estimated to be: remaining three quarters of 2017—$526 million; 2018—$668 million; 2019—$627 million; 2020—$599 million; 2021—$576 million; and 2022—$571 million.