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Income taxes - Uncertain tax positions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance, January 1 | $ 84 | $ 108 | $ 91
Additions based on tax positions related to the current year | 4 | 11 | 10
Additions for tax positions of prior years | 189 | 3 | 52
Reductions for tax positions of prior years | (2) | (21) | (9)
Settlements with tax authorities | (32) | (17) | (36)
Balance, December 31 | 243 | 84 | 108
Interest income (expense) recognized in the year ended December 31 | 4 | 8 | 6
Interest receivable (payable) as of December 31 | $ 13 | $ 9 | $ 0

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- Definition Amount of interest benefit (expense) for an overpayment or underpayment of income taxes. + References No definition available. + Details
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- Definition Amount of interest benefit (expense) accrued for an overpayment or underpayment of income taxes. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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