Intangible assets and goodwill

3 Months Ended

Mar. 31, 2021

Intangible assets and goodwill

Intangible assets and goodwill

7. INTANGIBLE ASSETS

	March 31, 2021						December 31, 2020
	Gross carrying value		Accumulated amortization		Net carrying value		Gross carrying value		Accumulated amortization		Net carrying value
Customer relationships	$	615	$	(157)	$	458	$	615	$	(146)	$	469
Technologies		369		(228)		141		369		(211)		158
Software		320		(135)		185		298		(125)		173
Backlog		129		(87)		42		129		(79)		50
Image library		80		(61)		19		80		(58)		22
Trade names and other		38		(16)		22		38		(15)		23
Intangible assets	$	1,551	$	(684)	$	867	$	1,529	$	(634)	$	895

Amortization expense related to intangible assets was $51 million and $66 million for the three months ended March 31, 2021 and 2020, respectively.