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Notes Payable and Long-Term Debt - Maturities and foreign subsidiary obligations (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Maturities of long-term debt |  |
2017 | $ 17 |
2018 | 21 |
2019 | 33 |
2020 | 42 |
2021 | 38 |
Thereafter | $ 366 |
Foreign subsidiary obligations due 2018 through 2023 |  |
Notes Payable and Long Term Debt |  |
Weighted average interest rate (as a percent) | 22.39% | 30.23%
Foreign subsidiary obligations due 2018 through 2023 | Property, Plant and Equipment |  |
Notes Payable and Long Term Debt |  |
Collateral amount | $ 4 |

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- Definition Amount of assets pledged to secure a debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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