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Summary of significant accounting policies (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($) segment	Dec. 31, 2017 USD ($)
Accounting Policies [Abstract]
Number of operating segments | segment	1
Accumulated depreciation and amortization on property, plant and equipment	$ 7,800	$ 7,600
Prior period sales due to change in estimates as a percentage of aggregate sales deductions (less than)	1.00%
Sales return provisions as a percentage of gross product sales (less than)	1.00%
New Accounting Pronouncement, Early Adoption [Line Items]
Accumulated deficit	$ (15,266)	(5,072)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Accumulated deficit		$ 25

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Sales Deductions On Prior Period Sales Due To Change In Estimate

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Sales Return Provisions As Percentage Of Product Sales

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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