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Fair value measurement (Changes in Contingent Consideration Obligation) (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Business Combination, Contingent Consideration [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 0 | $ 116,000,000
Fair Value, Measurements, Recurring [Member] |  |  |  |
Business Combination, Contingent Consideration [Roll Forward] |  |  |  |
Beginning balance |  |  | 69,000,000 |
Ending balance | $ 66,000,000 |  | 66,000,000 |
Fair Value, Measurements, Recurring [Member] | Significant unobservable inputs (Level 3) [Member] |  |  |  |
Business Combination, Contingent Consideration [Roll Forward] |  |  |  |
Beginning balance | 72,000,000 | $ 182,000,000 | 69,000,000 | 179,000,000
Addition from K-A acquisition | 0 | 0 | 45,000,000 | 0
Net changes in valuations | (6,000,000) | (114,000,000) | (48,000,000) | (111,000,000)
Ending balance | $ 66,000,000 | $ 68,000,000 | $ 66,000,000 | $ 68,000,000

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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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