Supplemental financial information - Other income (expense), net (OI&E) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Financial Information [Abstract]
Income from settlements related to intellectual property infringement	$ 188	$ 0	$ 0
Lease income	14	14	14
Interest income	11	6	7
Investment gains (losses)	5	3	5
Currency exchange gains (losses)	2	5	(4)
Tax interest income (expense)	(3)	8	6
Other	(6)	(4)	(7)
Total	$ 211	$ 32	$ 21

Income from settlements related to intellectual property infringement.

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- Definition

Other Nonoperating Income (Expense), Miscellaneous

+ References

No definition available.

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Supplemental financial information.

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No definition available.

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- Definition

Interest income (expense) as a result of income tax overpayment (underpayment) recognized in non-operating income (expense).

+ References

No definition available.

+ Details

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- Definition

Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 50
-Paragraph 1
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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7(b))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 25
-Paragraph 1
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Amount of income (expense) related to nonoperating activities, classified as other.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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-Section S99
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The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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