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Employee plans - Company's Investment Policy Targets and Ranges for Each Asset Category (Details) - Pension Plans | Dec. 31, 2017
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U.S. Plans | Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 58.00%
U.S. Plans | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 36.00%
U.S. Plans | Real estate |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 6.00%
U.S. Plans | Cash |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 0.00%
U.S. Plans | Other |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 0.00%
U.S. Plans | Minimum | Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 52.00%
U.S. Plans | Minimum | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 33.00%
U.S. Plans | Minimum | Real estate |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 3.00%
U.S. Plans | Minimum | Cash |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 0.00%
U.S. Plans | Minimum | Other |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 0.00%
U.S. Plans | Maximum | Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 64.00%
U.S. Plans | Maximum | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 39.00%
U.S. Plans | Maximum | Real estate |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 9.00%
U.S. Plans | Maximum | Cash |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 5.00%
International Plans | Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 24.00%
International Plans | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 60.00%
International Plans | Real estate |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 1.00%
International Plans | Cash |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 1.00%
International Plans | Other |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 14.00%
International Plans | Minimum | Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 18.00%
International Plans | Minimum | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 53.00%
International Plans | Minimum | Real estate |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 0.00%
International Plans | Minimum | Cash |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 0.00%
International Plans | Minimum | Other |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 7.00%
International Plans | Maximum | Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 30.00%
International Plans | Maximum | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 66.00%
International Plans | Maximum | Real estate |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 3.00%
International Plans | Maximum | Cash |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 5.00%
International Plans | Maximum | Other |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 21.00%

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- Definition 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. + References No definition available. + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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