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Notes Payable (Tables) - Notes Payable | 6 Months Ended
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Jun. 30, 2017
Debt |
Summary of debt | Our senior unsecured notes and bonds consist of the following, sorted by maturity date (dollars in millions):
|  | June 30, |  | December 31, |
|  | 2017 |  | 2016 |
5.375% notes, issued in September 2005 and due in September 2017 |  | $ | 175 |  | $ | 175 |
2.000% notes, issued in October 2012 and due in January 2018 |  | 350 |  | 350 |
6.750% notes, issued in September 2007 and due in August 2019 |  | 550 |  | 550 |
5.750% notes, issued in June 2010 and due in January 2021 |  | 250 |  | 250 |
3.250% notes, issued in October 2012 and due in October 2022 |  | 450 |  | 450 |
4.650% 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, $250 issued in September 2014 and $400 issued in March 2017, both due in October 2026 |  | 650 |  | 250 |
3.000% notes, issued in October 2016 and due in January 2027 |  | 600 |  | 600 |
5.875% bonds, $100 issued in March 2005 and $150 issued in June 2011, both due in March 2035 |  | 250 |  | 250 |
4.650% notes, issued in March 2017 and due in March 2047 |  | 300 |  | - |
Total principal amount |  | 4,675 |  | 3,975 |
Unamortized original issuance discounts and deferred financing costs |  | (33 | ) | (41 | )
|  | $ | 4,642 |  | $ | 3,934 |
Schedule of maturity of debt, net | The following table summarizes the maturity of our notes and bonds payable as of June 30, 2017, excluding unamortized original issuance discounts and deferred financing costs (dollars in millions):
Year of Maturity |  | Principal |
2017 |  | $ | 175 |
2018 |  | 350 |
2019 |  | 550 |
2020 |  | - |
2021 |  | 250 |
Thereafter |  | 3,350 |
Totals |  | $ | 4,675 |

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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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