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Employee plans - Company's Investment Policy Targets and Ranges for Each Asset Category (Details) - Pension Plans | Dec. 31, 2019
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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 | 19.00%
International Plans | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 61.00%
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 | 18.00%
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 | 54.00%
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 | 11.00%
International Plans | Maximum | Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 23.00%
International Plans | Maximum | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation percentage of assets | 67.00%
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 | 26.00%

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