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Notes Payable (Tables) - Notes and bonds payable | 3 Months Ended
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Mar. 31, 2019
Debt |
Schedule of unsecured notes and bonds | The total principal amount of our senior unsecured notes and bonds consists of the following, sorted by maturity date (dollars in millions), at March 31, 2019 and December 31, 2018, and excludes net unamortized original issuance premiums and deferred financing costs of $22.2 million at March 31, 2019 and $23.2 million at December 31, 2018:
5.750% notes, issued in June 2010 and due in January 2021 |  | $ | 250 |
3.250% notes, $450 issued in October 2012 and $500 issued in December 2017, both due in October 2022 |  | 950 |
4.650% notes, issued in July 2013 and due in August 2023 |  | 750 |
3.875% notes, issued in June 2014 and due in July 2024 |  | 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 |
3.000% notes, issued in October 2016 and due in January 2027 |  | 600 |
3.650% notes, issued in December 2017 and due in January 2028 |  | 550 |
5.875% bonds, $100 issued in March 2005 and $150 issued in June 2011, both due in March 2035 |  | 250 |
4.650% notes, $300 issued in March 2017 and $250 issued in December 2017, both due in March 2047 |  | 550 |
Total principal amount |  | $ | 5,400 |
Schedule of maturity of debt, net | The following table summarizes the maturity of our notes and bonds payable as of March 31, 2019, excluding net unamortized original issuance premiums and deferred financing costs (dollars in millions):
Year of Maturity |  | Principal |
2021 |  | $ | 250 |
2022 |  | 950 |
2023 |  | 750 |
Thereafter |  | 3,450 |
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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