Intangible Assets

3 Months Ended

Mar. 31, 2015

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, 2015						Dec. 31, 2014
	Gross		Accumulated		Net Book		Gross		Accumulated		Net Book
	Book Value		Amortization		Value		Book Value		Amortization		Value
Technology/Technical Know-How	$	1,744	$	568	$	1,176	$	1,747	$	535	$	1,212
Tradenames		1,640		335		1,305		1,641		319		1,322
Customer Relationships		2,530		555		1,975		2,531		523		2,008
Other		377		258		119		380		268		112
	$	6,291	$	1,716	$	4,575	$	6,299	$	1,645	$	4,654

Amortization expense charged to income was $88 million during the first quarter of 2015 and $86 million during the first quarter of 2014.

Based on the net book value of intangible assets at March 31, 2015, amortization charged to income for the subsequent five years is estimated to be: remaining three quarters of 2015—$270 million; 2016—$351 million; 2017—$342 million; 2018—$331 million; 2019—$323 million; and 2020—$302 million.