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Fair Value Disclosures (Tables) | 6 Months Ended
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Jun. 30, 2018
Fair Value Disclosures |
Estimated Fair Values and Carrying Amounts of Assets and Liabilities |
| Level in Fair Value Hierarchy |  | June 30, 2018 |  | December 31, 2017
|  | Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 1 |  | $ | 206 |  |  | $ | 206 |  |  | $ | 314 |  |  | $ | 314 |
Restricted cash, current and non-current | 1 |  | 130 |  |  | 130 |  |  | 126 |  |  | 126 |
Liabilities: |  |  |  |  |  |  |  |  |
Total debt and other obligations | 2 |  | 15,956 |  |  | 15,911 |  |  | 16,159 |  |  | 16,644 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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