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v3.19.1

Notes Payable - General (Details) - USD ($) | 1 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Mar. 31, 2017 | Sep. 30, 2014 | Oct. 31, 2012 | Jun. 30, 2011 | Mar. 31, 2005 | Mar. 31, 2019 | Dec. 31, 2018
Debt |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  |  | $ 5,377,712,000 | $ 5,376,797,000
Notes and bonds payable |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  |  | 5,400,000,000 | 5,400,000,000
Notes and bonds payable | 5.750% notes, issued in June 2010 and due in January 2021 |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  |  | $ 250,000,000 | $ 250,000,000
Interest rate (as a percent) |  |  |  |  |  |  | 5.75% | 5.75%
Notes and bonds payable | 3.250% notes, $450 issued in October 2012 and $500 issued in December 2017, both due in October 2022 |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  |  | $ 950,000,000 | $ 950,000,000
Interest rate (as a percent) |  |  |  |  |  |  | 3.25% | 3.25%
Notes and bonds payable | 3.250% notes, issued in October 2012 and due in October 2022 |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Issuance of debt |  |  |  | $ 450,000,000 |  |  |  |
Notes and bonds payable | 3.250% notes, issued in December 2017 and due in October 2022 |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Issuance of debt | $ 500,000,000 |  |  |  |  |  |  |
Notes and bonds payable | 4.650% notes, issued in July 2013 and due in August 2023 |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  |  | $ 750,000,000 | $ 750,000,000
Interest rate (as a percent) |  |  |  |  |  |  | 4.65% | 4.65%
Notes and bonds payable | 3.875% notes, issued in June 2014 and due in July 2024 |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  |  | $ 350,000,000 | $ 350,000,000
Interest rate (as a percent) |  |  |  |  |  |  | 3.875% | 3.875%
Notes and bonds payable | 3.875% notes, issued in April 2018 and due in April 2025 |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  |  | $ 500,000,000 | $ 500,000,000
Interest rate (as a percent) |  |  |  |  |  |  | 3.875% | 3.875%
Notes and bonds payable | 4.125% notes, $250 issued in September 2014 and $400 issued in March 2017, both due in October 2026 |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  |  | $ 650,000,000 | $ 650,000,000
Interest rate (as a percent) |  |  |  |  |  |  | 4.125% | 4.125%
Notes and bonds payable | 4.125% notes, issued in September 2014 and due in October 2026 |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Issuance of debt |  |  | $ 250,000,000 |  |  |  |  |
Notes and bonds payable | 4.125% notes, issued in March 2017 and due in October 2026 |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Issuance of debt |  | $ 400,000,000 |  |  |  |  |  |
Notes and bonds payable | 3.000% notes, issued in October 2016 and due in January 2027 |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  |  | $ 600,000,000 | $ 600,000,000
Interest rate (as a percent) |  |  |  |  |  |  | 3.00% | 3.00%
Notes and bonds payable | 3.650% notes, issued in December 2017 and due in January 2028 |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  |  | $ 550,000,000 | $ 550,000,000
Interest rate (as a percent) |  |  |  |  |  |  | 3.65% | 3.65%
Notes and bonds payable | 5.875% bonds, $100 issued in March 2005 and $150 issued in June 2011, both due in March 2035 |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  |  | $ 250,000,000 | $ 250,000,000
Interest rate (as a percent) |  |  |  |  |  |  | 5.875% | 5.875%
Notes and bonds payable | 5.875% bonds, issued in March 2005 and due in March 2035 |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Issuance of debt |  |  |  |  |  | $ 100,000,000 |  |
Notes and bonds payable | 5.875% bonds, issued in June 2011 and due in March 2035 |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Issuance of debt |  |  |  |  | $ 150,000,000 |  |  |
Notes and bonds payable | 4.650% notes, $300 issued in March 2017 and $250 issued in December 2017, both due in March 2047 |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Total principal amount |  |  |  |  |  |  | $ 550,000,000 | $ 550,000,000
Interest rate (as a percent) |  |  |  |  |  |  | 4.65% | 4.65%
Notes and bonds payable | 4.650% notes, issued in March 2017 and due in March 2047 |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Issuance of debt |  | $ 300,000,000 |  |  |  |  |  |
Notes and bonds payable | 4.650% notes, issued in December 2017 and due in March 2047 |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |
Issuance of debt | $ 250,000,000 |  |  |  |  |  |  |

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