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Commiments and Contingencies Commiments and Contingencies (Tables) | 9 Months Ended
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Sep. 30, 2023
Legal and Environmental Matters [Abstract] |
Schedule of Loss Contingencies by Contingency [Table Text Block] | We maintain reserves for various contingent liabilities as follows (dollar amounts in millions):
| September 30, 2023 |  | December 31, 2022
Environmental reserves | $ | 26 |  |  | $ | 27 |
Other reserves | — |  |  | — |
Total contingencies | 26 |  |  | 27 |
Current portion (included in Accounts payable and accrued liabilities) | (1) |  |  | (1) |
Long-term portion | $ | 25 |  |  | $ | 26 |

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- Definition Tabular disclosure of the loss contingencies that were reported in the period or disclosed as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-4 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 450 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483076/450-20-50-9 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-3 + Details
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