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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Intangible assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Intangible assets (Details) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Finite-lived intangible assets:
Gross carrying value	$ 1,636		$ 1,636		$ 1,595
Accumulated amortization	(735)		(735)		(604)
Net carrying value	901		901		991
Amortization of intangible assets	66	$ 68	132	$ 135
Customer relationships
Finite-lived intangible assets:
Gross carrying value	615		615		615
Accumulated amortization	(124)		(124)		(102)
Net carrying value	491		491		513
Backlog
Finite-lived intangible assets:
Gross carrying value	330		330		330
Accumulated amortization	(265)		(265)		(217)
Net carrying value	65		65		113
Technologies
Finite-lived intangible assets:
Gross carrying value	320		320		320
Accumulated amortization	(177)		(177)		(144)
Net carrying value	143		143		176
Software
Finite-lived intangible assets:
Gross carrying value	254		254		213
Accumulated amortization	(103)		(103)		(83)
Net carrying value	151		151		130
Image library
Finite-lived intangible assets:
Gross carrying value	80		80		80
Accumulated amortization	(54)		(54)		(48)
Net carrying value	26		26		32
Trade names and other
Finite-lived intangible assets:
Gross carrying value	37		37		37
Accumulated amortization	(12)		(12)		(10)
Net carrying value	$ 25		$ 25		$ 27