Intangible Assets

9 Months Ended

Sep. 30, 2014

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, 2014						Dec. 31, 2013
	Gross		Accumulated		Net Book		Gross		Accumulated		Net Book
	Book Value		Amortization		Value		Book Value		Amortization		Value
Technology/Technical Know-How	$	1,960	$	681	$	1,279	$	1,960	$	597	$	1,363
Tradenames		1,640		301		1,339		1,647		257		1,390
Customer Relationships		2,460		493		1,967		2,263		407		1,856
Other		372		267		105		435		335		100
	$	6,432	$	1,742	$	4,690	$	6,305	$	1,596	$	4,709

Amortization expense charged to income was as follows:

	(Stated in millions)
	2014		2013
Third Quarter	$	88	$	80
Nine Months	$	257	$	244

The weighted average amortization period for all intangible assets is approximately 20 years.

Based on the net book value of intangible assets at September 30, 2014, amortization charged to income for the subsequent five years is estimated to be: remainder of 2014—$90 million; 2015—$358 million; 2016—$349 million; 2017—$340 million; 2018—$331 million; and 2019—$320 million.