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Debt and Credit Facilities | 12 Months Ended
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Dec. 31, 2017
Long-term Debt, Unclassified [Abstract] |
Debt And Credit Facilities | DEBT AND CREDIT FACILITIES In January 2017 we issued $500 of senior unsecured notes with a fixed interest rate of 1.800% due on January 15, 2019. Our commercial paper program allows us to have a maximum of $1,500 in commercial paper outstanding with maturities up to 397 days from the date of issuance. On December 31, 2017 there were no amounts outstanding under our commercial paper program. We have lines of credit issued by various financial institutions that are available to fund our day-to-day operating needs. Certain of our credit facilities require us to comply with financial and other covenants. We were in compliance with all covenants on December 31, 2017.
Summary of Total Debt
|  | 2017 |  | 2016
Senior unsecured notes: |  |  |  |
| Rate |  | Due |  |  |  |
| 1.300% |  | April 1, 2018 | $ | 600 |  |  | $ | 598 |
| 1.800% |  | January 15, 2019 | 499 |  |  | — |
| 2.000% |  | March 8, 2019 | 748 |  |  | 746 |
| 4.375% |  | January 15, 2020 | 498 |  |  | 497 |
| 2.625% |  | March 15, 2021 | 746 |  |  | 745 |
| 3.375% |  | May 15, 2024 | 598 |  |  | 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 |  | $ | 7,222 |  |  | $ | 6,914 |
Less current maturities |  | 632 |  |  | 228 |
Total long-term debt |  | $ | 6,590 |  |  | $ | 6,686 |
Unamortized debt issuance costs | $ | 39 |  |  | $ | 45 |
Borrowing capacity on existing facilities | $ | 1,547 |  |  | $ | 1,551 |
Fair value of senior unsecured notes | $ | 7,521 |  |  | $ | 6,762 |
The fair value of the senior unsecured notes was estimated using quoted interest rates, maturities and amounts of borrowings based on quoted active market prices and yields that took into account the underlying terms of the debt instruments. Substantially all of our debt is classified within Level 2 of the fair value hierarchy. Interest expense, including required fees incurred on outstanding debt and credit facilities that were included in other expense, totaled $247, $228, and $108 in 2017, 2016 and 2015.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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