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Intangible Assets
 9 Months Ended
Sep. 30, 2016
Goodwill And Intangible Assets Disclosure [Abstract]  
Intangible Assets

9.   Intangible Assets

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

 

 

(Stated in millions)

 

 

 

 

 

Sept. 30, 2016

 

 

Dec. 31, 2015

 

 

Gross

 

 

Accumulated

 

 

Net Book

 

 

Gross

 

 

Accumulated

 

 

Net Book

 

 

Book Value

 

 

Amortization

 

 

Value

 

 

Book Value

 

 

Amortization

 

 

Value

 

Customer relationships

$

4,879

 

 

$

806

 

 

$

4,073

 

 

$

2,489

 

 

$

645

 

 

$

1,844

 

Technology/technical know-how

 

3,614

 

 

 

778

 

 

 

2,836

 

 

 

1,864

 

 

 

653

 

 

 

1,211

 

Tradenames

 

2,847

 

 

 

432

 

 

 

2,415

 

 

 

1,625

 

 

 

367

 

 

 

1,258

 

Other

 

1,064

 

 

 

551

 

 

 

513

 

 

 

513

 

 

 

257

 

 

 

256

 

 

$

12,404

 

 

$

2,567

 

 

$

9,837

 

 

$

6,491

 

 

$

1,922

 

 

$

4,569

 

 

Amortization expense charged to income was as follows:

(Stated in millions)

 

 

 

 

 

 

 

 

 

 

2016

 

 

2015

 

Third Quarter

$

156

 

 

$

88

 

Nine Months

$

405

 

 

$

267

 

Based on the net book value of intangible assets at September 30, 2016, amortization charged to income for the subsequent five years is estimated to be: remaining quarter of 2016—$166 million; 2017—$668 million; 2018—$660 million; 2019—$633 million; 2020—$596 million; and 2021—$571 million.