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Summary of Significant Accounting Policies Other long term liabilities (Tables) | 12 Months Ended
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Dec. 31, 2019
Other Noncurrent Liabilities [Table Text Block] | Other long-term liabilities were as follows:
| December 31,
Dollar amounts in millions | 2019 |  | 2018
Asset retirement obligations | $ | 11 |  |  | $ | 12 |
Uncertain tax positions | 37 |  |  | 40 |
Post-retirement obligations | 9 |  |  | 8 |
Pension obligations, net | 25 |  |  | 25 |
Warranty reserves | 6 |  |  | 11 |
Other | 37 |  |  | 38 |
Total Other long-term liabilities | $ | 125 |  |  | $ | 134 |

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- Definition Tabular disclosure of other noncurrent liabilities. + References No definition available. + Details
Name: | us-gaap_OtherNoncurrentLiabilitiesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration