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Debt and Credit Facilities | 9 Months Ended
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Sep. 30, 2018
Long-term Debt, Unclassified [Abstract] |
Debt And Credit Facilities | DEBT AND CREDIT FACILITIES In March 2018 we issued $600 of senior unsecured notes with a coupon of 3.650% due on March 7, 2028 (the notes). Our annual interest expense arising from the issuance of the notes will be reduced by the benefit from the cash flow hedges that were terminated in conjunction with the issuance. Refer to Note 4 for further information. In April 2018 we repaid $600 of our senior unsecured notes with a coupon of 1.300%. 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 September 30, 2018 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. In August 2018 we extended for an additional two years the maturity date of our $1,500 Credit Agreement, which now matures on August 19, 2023. Certain of our credit facilities require us to comply with financial and other covenants. We were in compliance with all covenants on September 30, 2018.
Summary of Total Debt | September 2018 |  | December 2017
Senior unsecured notes: |  |  |
| Rate |  | Due |  |  |
| 1.300% |  | April 1, 2018 | $ | — |  |  | $ | 600 |
| 1.800% |  | January 15, 2019 | 500 |  |  | 499 |
| 2.000% |  | March 8, 2019 | 749 |  |  | 748 |
| 4.375% |  | January 15, 2020 | 499 |  |  | 498 |
| 2.625% |  | March 15, 2021 | 747 |  |  | 746 |
| 3.375% |  | May 15, 2024 | 584 |  |  | 598 |
| 3.375% |  | November 1, 2025 | 746 |  |  | 745 |
| 3.500% |  | March 15, 2026 | 989 |  |  | 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 |
Other | 28 |  |  | 35 |
Total debt | $ | 7,203 |  |  | $ | 7,222 |
Less current maturities of debt | 1,275 |  |  | 632 |
Total long-term debt | $ | 5,928 |  |  | $ | 6,590 |
Unamortized debt issuance costs | $ | 39 |  |  | $ | 39 |
Available borrowing capacity | $ | 1,553 |  |  | $ | 1,547 |
Fair value of senior unsecured notes | $ | 7,118 |  |  | $ | 7,521 |
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 considered the underlying terms of the debt instruments. Substantially all our debt is classified within Level 2 of the fair value hierarchy.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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