Intangible assets (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Finite-lived intangible assets:
Gross carrying value	$ 1,612		$ 1,595
Accumulated amortization	(669)		(604)
Net carrying value	943		991
Amortization of intangible assets	66	$ 67
Trade names and other
Finite-lived intangible assets:
Gross carrying value	37		37
Accumulated amortization	(11)		(10)
Net carrying value	26		27
Customer relationships
Finite-lived intangible assets:
Gross carrying value	615		615
Accumulated amortization	(113)		(102)
Net carrying value	502		513
Backlog
Finite-lived intangible assets:
Gross carrying value	330		330
Accumulated amortization	(241)		(217)
Net carrying value	89		113
Technologies
Finite-lived intangible assets:
Gross carrying value	320		320
Accumulated amortization	(161)		(144)
Net carrying value	159		176
Software
Finite-lived intangible assets:
Gross carrying value	230		213
Accumulated amortization	(92)		(83)
Net carrying value	138		130
Image library
Finite-lived intangible assets:
Gross carrying value	80		80
Accumulated amortization	(51)		(48)
Net carrying value	$ 29		$ 32

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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