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Retirement Benefits - Assumptions (Details) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Retirement benefits other than pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension cost | 2.90% | 2.40% | 3.30%
Benefit obligation at year end | 5.60% | 2.90% | 2.40%
Expected return on assets | 8.00% | 8.00% | 8.00%
U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension cost | 2.80% | 2.40% | 3.30%
Benefit obligation at year end | 5.40% | 2.80% | 2.40%
Expected return on assets | 7.00% | 7.00% | 7.00%
Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension cost | 2.80% | 2.30% | 3.20%
Benefit obligation at year end | 5.40% | 2.80% | 2.30%
Expected return on assets | 3.76% | 3.55% | 3.28%
Average rate of increase in salaries - pension cost | 1.60% | 1.90% | 2.60%
Average rate of increase in salaries - benefit obligation at year end | 1.90% | 1.60% | 1.90%
UMWA Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension cost | 2.80% | 2.30% | 3.20%
Benefit obligation at year end | 5.40% | 2.80% | 2.30%
Black Lung and Other Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension cost | 2.70% | 2.20% | 3.10%
Benefit obligation at year end | 5.40% | 2.70% | 2.20%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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