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Debt and Credit Facilities (Tables) | 3 Months Ended
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Mar. 31, 2018
Long-term Debt, Unclassified [Abstract] |
Schedule of Long-term Debt Instruments |
Summary of Total Debt | March 2018 | December 2017
Senior unsecured notes: |  |
| Rate |  | Due |  |
| 1.300% |  | April 1, 2018 | $ | 600 |  | $ | 600 |
| 1.800% |  | January 15, 2019 | 499 |  | 499 |
| 2.000% |  | March 8, 2019 | 748 |  | 748 |
| 4.375% |  | January 15, 2020 | 498 |  | 498 |
| 2.625% |  | March 15, 2021 | 746 |  | 746 |
| 3.375% |  | May 15, 2024 | 582 |  | 598 |
| 3.375% |  | November 1, 2025 | 745 |  | 745 |
| 3.500% |  | March 15, 2026 | 988 |  | 988 |
| 3.650% |  | March 7, 2028 | 595 |  | — |
| 4.100% |  | April 1, 2043 | 391 |  | 391 |
| 4.375% |  | May 15, 2044 | 395 |  | 394 |
| 4.625% |  | March 15, 2046 | 980 |  | 980 |
Commercial paper | 100 |  | — |
Other | 37 |  | 35 |
Total debt | $ | 7,904 |  | $ | 7,222 |
Less current maturities of debt | 1,984 |  | 632 |
Total long-term debt | $ | 5,920 |  | $ | 6,590 |
Unamortized debt issuance costs | $ | 42 |  | $ | 39 |
Available borrowing capacity | $ | 1,547 |  | $ | 1,547 |
Fair value of senior unsecured notes | $ | 7,893 |  | $ | 7,521 |

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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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