Intangible Assets

6 Months Ended

Jun. 30, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Intangible Assets

6.   Intangible Assets

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

	(Stated in millions)
	Jun. 30, 2021						Dec. 31, 2020
	Gross		Accumulated		Net Book		Gross		Accumulated		Net Book
	Book Value		Amortization		Value		Book Value		Amortization		Value
Customer relationships	$	1,691	$	510	$	1,181	$	1,744	$	485	$	1,259
Technology/technical know-how		1,294		540		754		1,284		488		796
Tradenames		767		182		585		767		166		601
Other		1,523		732		791		1,488		689		799
	$	5,275	$	1,964	$	3,311	$	5,283	$	1,828	$	3,455

Amortization expense charged to income was as follows:

(Stated in millions)
	2021		2020
Second Quarter	$	75	$	80
Six Months	$	151	$	213

Based on the net book value of intangible assets at June 30, 2021, amortization charged to income for the subsequent five years is estimated to be: remaining two quarters of 2021—$152 million; 2022—$293 million; 2023—$286 million; 2024—$262 million; 2025—$248 million; and 2026—$244 million.