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Employee plans - Company's Investment Policy Targets and Ranges for Each Asset Category (Details) - Pension Plans | Dec. 31, 2018
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U.S. Plans | Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 42.00%
U.S. Plans | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 38.00%
U.S. Plans | Real estate |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 0.00%
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 | 20.00%
U.S. Plans | Minimum | Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 36.00%
U.S. Plans | Minimum | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 35.00%
U.S. Plans | Minimum | Real estate |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 0.00%
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 | 10.00%
U.S. Plans | Maximum | Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 48.00%
U.S. Plans | Maximum | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 41.00%
U.S. Plans | Maximum | Real estate |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 0.00%
U.S. Plans | Maximum | Cash |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 5.00%
U.S. Plans | Maximum | Other |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 30.00%
International Plans | Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 22.00%
International Plans | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 62.00%
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 | 16.00%
International Plans | Minimum | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 55.00%
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 | 28.00%
International Plans | Maximum | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 68.00%
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 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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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