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Employee plans - Company's Investment Policy Targets and Ranges for Each Asset Category (Details) | 12 Months Ended
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Dec. 31, 2016
U.S. Plans | Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 58.00%
Defined benefit plan target plan asset allocations range, minimum | 52.00%
Defined benefit plan target plan asset allocations range, maximum | 64.00%
U.S. Plans | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 36.00%
Defined benefit plan target plan asset allocations range, minimum | 33.00%
Defined benefit plan target plan asset allocations range, maximum | 39.00%
U.S. Plans | Real estate |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 6.00%
Defined benefit plan target plan asset allocations range, minimum | 3.00%
Defined benefit plan target plan asset allocations range, maximum | 9.00%
U.S. Plans | Cash |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 0.00%
Defined benefit plan target plan asset allocations range, minimum | 0.00%
Defined benefit plan target plan asset allocations range, maximum | 5.00%
U.S. Plans | Other |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 0.00%
Defined benefit plan target plan asset allocations range, minimum | 0.00%
International Plans | Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 29.00%
Defined benefit plan target plan asset allocations range, minimum | 23.00%
Defined benefit plan target plan asset allocations range, maximum | 35.00%
International Plans | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 55.00%
Defined benefit plan target plan asset allocations range, minimum | 48.00%
Defined benefit plan target plan asset allocations range, maximum | 61.00%
International Plans | Real estate |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 1.00%
Defined benefit plan target plan asset allocations range, minimum | 0.00%
Defined benefit plan target plan asset allocations range, maximum | 3.00%
International Plans | Cash |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 1.00%
Defined benefit plan target plan asset allocations range, minimum | 0.00%
Defined benefit plan target plan asset allocations range, maximum | 5.00%
International Plans | Other |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 14.00%
Defined benefit plan target plan asset allocations range, minimum | 7.00%
Defined benefit plan target plan asset allocations range, maximum | 21.00%

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