Amount of liabilities assumed, net of identifiable assets and goodwill, at the acquisition date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Business combinations - Neptec (Details) - USD ($) $ in Millions		12 Months Ended
	Jul. 16, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business combination
Acquisition cost, net of cash acquired		$ 6	$ 2,273
Goodwill		$ 1,751	$ 2,374	$ 699
Neptec
Business combination
Acquisition cost, net of cash acquired	$ 30
Cash paid for acquisition	6
Goodwill	21
Intangible assets	11
Net liabilities	$ 2