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Debt and Credit Facilities (Tables) | 9 Months Ended
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Sep. 30, 2017
Long-term Debt, Unclassified [Abstract] |
Schedule of Long-term Debt Instruments |
Summary of Total Debt
Senior unsecured notes: |  | September 2017 | December 2016
| Rate |  | Due |  |  |
| 1.300% |  | April 1, 2018 |  | $ | 599 |  | $ | 598 |
| 1.800% |  | January 15, 2019 |  | 499 |  | — |
| 2.000% |  | March 8, 2019 |  | 747 |  | 746 |
| 4.375% |  | January 15, 2020 |  | 498 |  | 497 |
| 2.625% |  | March 15, 2021 |  | 746 |  | 745 |
| 3.375% |  | May 15, 2024 |  | 603 |  | 602 |
| 3.375% |  | November 1, 2025 |  | 745 |  | 744 |
| 3.500% |  | March 15, 2026 |  | 988 |  | 987 |
| 4.100% |  | April 1, 2043 |  | 391 |  | 391 |
| 4.375% |  | May 15, 2044 |  | 394 |  | 395 |
| 4.625% |  | March 15, 2046 |  | 980 |  | 979 |
Commercial paper |  | — |  | 200 |
Other |  | 35 |  | 30 |
Total debt |  | $ | 7,225 |  | $ | 6,914 |
Less current maturities |  | 632 |  | 228 |
Total long-term debt |  | $ | 6,593 |  | $ | 6,686 |
Unamortized debt issuance costs | $ | 41 |  | $ | 45 |
Available borrowing capacity | $ | 1,542 |  | $ | 1,551 |
Fair value of debt |  | $ | 7,446 |  | $ | 6,762 |

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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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