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Debt and Credit Facilities (Tables) | 9 Months Ended
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Sep. 30, 2018
Debt Disclosure [Abstract] |
Summary of Debt Carrying Amount | The following table summarizes our borrowings under various financing arrangements (in millions):
|  |  |  |  |  |  |  | Carrying Amount
Type of Borrowing |  | Issue Date |  | Due Date |  | Interest Rate |  | September 30, 2018 |  | December 31, 2017
Senior Unsecured |  | September 2015 |  | September 2018 |  | 1.85% |  | $ | — |  |  | $ | 999 |
Senior Unsecured |  | September 2017 |  | September 2018 |  | 3-month LIBOR + 0.17% |  | — |  |  | 749 |
Term Loan |  | October 2017 |  | October 2018 |  | Variable |  | — |  |  | 999 |
Senior Unsecured |  | September 2017 |  | March 2019 |  | 3-month LIBOR + 0.22% |  | 749 |  |  | 748 |
Senior Unsecured |  | March 2014 |  | April 2019 |  | 2.05% |  | 500 |  |  | 499 |
Senior Unsecured |  | September 2017 |  | September 2019 |  | 1.85% |  | 998 |  |  | 997 |
Senior Unsecured |  | September 2017 |  | September 2019 |  | 3-month LIBOR + 0.25% |  | 499 |  |  | 499 |
Senior Unsecured |  | November 2014 |  | February 2020 |  | 2.35% |  | 499 |  |  | 499 |
Senior Unsecured |  | September 2015 |  | September 2020 |  | 2.55% |  | 1,995 |  |  | 1,994 |
Term Loan |  | October 2017 |  | October 2020 |  | Variable |  | — |  |  | 998 |
Senior Unsecured |  | March 2011 |  | April 2021 |  | 4.50% |  | 996 |  |  | 995 |
Senior Unsecured |  | December 2011 |  | December 2021 |  | 4.40% |  | 1,247 |  |  | 1,246 |
Senior Unsecured |  | September 2016 |  | March 2022 |  | 1.95% |  | 498 |  |  | 497 |
Senior Unsecured |  | September 2015 |  | September 2022 |  | 3.25% |  | 997 |  |  | 996 |
Term Loan |  | October 2017 |  | October 2022 |  | Variable |  | — |  |  | 2,497 |
Senior Unsecured |  | September 2016 |  | September 2023 |  | 2.50% |  | 745 |  |  | 745 |
Senior Unsecured |  | March 2014 |  | April 2024 |  | 3.70% |  | 1,743 |  |  | 1,742 |
Senior Unsecured |  | November 2014 |  | February 2025 |  | 3.50% |  | 1,745 |  |  | 1,744 |
Senior Unsecured |  | September 2015 |  | March 2026 |  | 3.65% |  | 2,731 |  |  | 2,729 |
Senior Unsecured |  | September 2016 |  | March 2027 |  | 2.95% |  | 1,245 |  |  | 1,244 |
Senior Unsecured |  | September 2015 |  | September 2035 |  | 4.60% |  | 990 |  |  | 990 |
Senior Unsecured |  | September 2016 |  | September 2036 |  | 4.00% |  | 740 |  |  | 740 |
Senior Unsecured |  | December 2011 |  | December 2041 |  | 5.65% |  | 995 |  |  | 995 |
Senior Unsecured |  | March 2014 |  | April 2044 |  | 4.80% |  | 1,734 |  |  | 1,733 |
Senior Unsecured |  | November 2014 |  | February 2045 |  | 4.50% |  | 1,730 |  |  | 1,730 |
Senior Unsecured |  | September 2015 |  | March 2046 |  | 4.75% |  | 2,216 |  |  | 2,215 |
Senior Unsecured |  | September 2016 |  | March 2047 |  | 4.15% |  | 1,724 |  |  | 1,723 |
Total debt, net |  | 27,316 |  |  | 33,542 |
Less current portion |  | 2,746 |  |  | 2,747 |
Total long-term debt, net |  | $ | 24,570 |  |  | $ | 30,795 |

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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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