Intangible assets (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Finite-lived intangible assets:
Gross carrying value	$ 1,608		$ 1,585
Accumulated amortization	(847)		(798)
Net carrying value	761		787
Amortization of intangible assets	49	$ 51
Customer relationships
Finite-lived intangible assets:
Gross carrying value	615		615
Accumulated amortization	(201)		(190)
Net carrying value	414		425
Software
Finite-lived intangible assets:
Gross carrying value	402		379
Accumulated amortization	(161)		(152)
Net carrying value	241		227
Technologies
Finite-lived intangible assets:
Gross carrying value	367		367
Accumulated amortization	(295)		(278)
Net carrying value	72		89
Backlog
Finite-lived intangible assets:
Gross carrying value	107		107
Accumulated amortization	(96)		(89)
Net carrying value	11		18
Image library
Finite-lived intangible assets:
Gross carrying value	80		80
Accumulated amortization	(74)		(71)
Net carrying value	6		9
Trade names and other.
Finite-lived intangible assets:
Gross carrying value	37		37
Accumulated amortization	(20)		(18)
Net carrying value	$ 17		$ 19

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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