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Notes Payable (Tables) - Note payable | 12 Months Ended
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Dec. 31, 2015
Credit facility |
Schedule of Notes payable | Our senior unsecured notes and bonds consisted of the following, sorted by maturity date (dollars in millions):
|  | December 31, |  | December 31, |
|  | 2015 |  | 2014 |
5.5% notes, issued in November 2003 and due in November 2015 |  | $ | - |  | $ | 150 |
5.95% notes, issued in September 2006 and due in September 2016 |  | 275 |  | 275 |
5.375% notes, issued in September 2005 and due in September 2017 |  | 175 |  | 175 |
2.0% notes, issued in October 2012 and due in January 2018 |  | 350 |  | 350 |
6.75% notes, issued in September 2007 and due in August 2019 |  | 550 |  | 550 |
5.75% notes, issued in June 2010 and due in January 2021 |  | 250 |  | 250 |
3.25% notes, issued in October 2012 and due in October 2022 |  | 450 |  | 450 |
4.65% notes, issued in July 2013 and due in August 2023 |  | 750 |  | 750 |
3.875% notes, issued in June 2014 and due in July 2024 |  | 350 |  | 350 |
4.125% notes, issued in September 2014 and due in October 2026 |  | 250 |  | 250 |
5.875% bonds, $100 issued in March 2005 and $150 issued in |  |  |  |  |
June 2011, both due in March 2035 |  | 250 |  | 250 |
Total principal amount |  | 3,650 |  | 3,800 |
Unamortized original issuance discounts |  | (13 | ) | (15 | )
|  | $ | 3,637 |  | $ | 3,785 |
Summary of maturity of notes and bonds payable excluding unamortized original issuance discounts | The following table summarizes the maturity of our notes and bonds payable as of December 31, 2015, excluding unamortized original issuance discounts (dollars in millions):
Year of Maturity |  | Principal |
2016 |  | $ | 275 |
2017 |  | 175 |
2018 |  | 350 |
2019 |  | 550 |
2020 |  | - |
Thereafter |  | 2,300 |
Totals |  | $ | 3,650 |

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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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