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Summary of Significant Accounting Policies Accounts payable and accrued liabilities (Tables) | 12 Months Ended
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Dec. 31, 2019
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] | Accounts payable and accrued liabilities were as follows:
| December 31,
Dollar amounts in millions | 2019 |  | 2018
Accounts payable | $ | 127 |  |  | $ | 116 |
Salaries and wages payable | 48 |  |  | 58 |
Accrued severance | 4 |  |  | 6 |
Taxes other than income taxes | 7 |  |  | 4 |
Accrued rebates | 34 |  |  | 30 |
Current portion of operating lease liabilities | 8 |  |  | — |
Other accrued liabilities | 14 |  |  | 20 |
Total Accounts payable and accrued liabilities | $ | 242 |  |  | $ | 234 |

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- Definition Tabular disclosure of the (a) carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business (accounts payable); (b) other payables; and (c) accrued liabilities. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). An alternative caption includes accrued expenses. + References No definition available. + Details
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