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Employee plans - Company's Investment Policy Targets and Ranges for Each Asset Category (Details) - Pension Plans | Dec. 31, 2021
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U.S. Plans | Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 52.00%
U.S. Plans | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 34.00%
U.S. Plans | Cash |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 0.00%
U.S. Plans | Other |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 14.00%
U.S. Plans | Minimum | Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 47.00%
U.S. Plans | Minimum | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 29.00%
U.S. Plans | Minimum | Cash |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 0.00%
U.S. Plans | Minimum | Other |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 9.00%
U.S. Plans | Maximum | Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 57.00%
U.S. Plans | Maximum | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 39.00%
U.S. Plans | Maximum | Cash |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 5.00%
U.S. Plans | Maximum | Other |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 19.00%
International Plans | Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 18.00%
International Plans | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 62.00%
International Plans | Cash |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 0.00%
International Plans | Other |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 20.00%
International Plans | Minimum | Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 15.00%
International Plans | Minimum | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 57.00%
International Plans | Minimum | Cash |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 0.00%
International Plans | Minimum | Other |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 17.00%
International Plans | Maximum | Equity securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 20.00%
International Plans | Maximum | Debt securities |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 66.00%
International Plans | Maximum | Cash |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 5.00%
International Plans | Maximum | Other |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan target allocation as proportion of assets (as a percent) | 24.00%

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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=123450688&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=123447040&loc=d3e1928-114920 + Details
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