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Notes Payable (Tables) - Notes Payable | 9 Months Ended
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Sep. 30, 2018
Debt |
Schedule of notes payable | Our senior unsecured notes and bonds consist of the following, sorted by maturity date (dollars in millions):
| September 30, 2018 |  | December 31, 2017
2.000% notes, issued in October 2012 and due in January 2018 | $ | — |  | $ | 350
5.750% notes, issued in June 2010 and due in January 2021 | 250 |  | 250
3.250% notes, $450 issued in October 2012 and $500 issued in December 2017, both due in October 2022 | 950 |  | 950
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
3.875% notes, issued in April 2018 and due in April 2025 | 500 |  | —
4.125% notes, $250 issued in September 2014 and $400 issued in March 2017, both due in October 2026 | 650 |  | 650
3.000% notes, issued in October 2016 and due in January 2027 | 600 |  | 600
3.650% notes, issued in December 2017 and due in January 2028 | 550 |  | 550
5.875% bonds, $100 issued in March 2005 and $150 issued in June 2011, both due in March 2035 | 250 |  | 250
4.650% notes, $300 issued in March 2017 and $250 issued in December 2017, both due in March 2047 | 550 |  | 550
Total principal amount | 5,400 |  | 5,250
Unamortized net original issuance premiums and deferred financing costs | (24) |  | (20)
| $ | 5,376 |  | $ | 5,230
Schedule of maturity of debt, net | The following table summarizes the maturity of our notes and bonds payable as of September 30, 2018, excluding net unamortized original issuance premiums and deferred financing costs (dollars in millions):
Year of Maturity | Principal
2021 | $ | 250
2022 | 950
Thereafter | 4,200
Totals | $ | 5,400

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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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