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Debt and Credit Facilities | 6 Months Ended
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Jun. 30, 2021
Long-term Debt, Unclassified [Abstract] |
Debt And Credit Facilities | DEBT AND CREDIT FACILITIESWe 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 June 30, 2021. Our commercial paper program backed by our primary revolving credit facility which expires in August 2023 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 June 30, 2021 there were no borrowings outstanding under our credit facility or commercial paper programs.
Summary of Total Debt | June 2021 |  | December 2020
| Rate |  | Due |  |  |
Senior unsecured notes: |  |  |
| 2.625% |  | March 15, 2021 | $ | — |  |  | $ | 750 |
| 1.125% |  | November 30, 2023 | 655 |  |  | 668 |
| 0.600% |  | December 1, 2023 | 597 |  |  | 597 |
| 3.375% |  | May 15, 2024 | 592 |  |  | 590 |
| 0.250% |  | December 3, 2024 | 1,010 |  |  | 1,030 |
| 1.150% |  | June 15, 2025 | 645 |  |  | 644 |
| 3.375% |  | November 1, 2025 | 747 |  |  | 747 |
| 3.500% |  | March 15, 2026 | 993 |  |  | 992 |
| 2.125% |  | November 30, 2027 | 891 |  |  | 909 |
| 3.650% |  | March 7, 2028 | 596 |  |  | 596 |
| 0.750% |  | March 1, 2029 | 950 |  |  | 969 |
| 1.950% |  | June 15, 2030 | 989 |  |  | 989 |
| 2.625% |  | November 30, 2030 | 767 |  |  | 782 |
| 1.000% |  | December 3, 2031 | 885 |  |  | 903 |
| 4.100% |  | April 1, 2043 | 392 |  |  | 392 |
| 4.375% |  | May 15, 2044 | 395 |  |  | 395 |
| 4.625% |  | March 15, 2046 | 982 |  |  | 981 |
| 2.900% |  | June 15, 2050 | 642 |  |  | 641 |
Variable term loan |  | November 10, 2023 | — |  |  | 400 |
Other |  |  | 12 |  |  | 16 |
Total debt | $ | 12,740 |  |  | $ | 13,991 |
Less current maturities of debt | 6 |  |  | 761 |
Total long-term debt | $ | 12,734 |  |  | $ | 13,230 |
| June 2021 |  | December 2020
Unamortized debt issuance costs | $ | 66 |  |  | $ | 71 |
Borrowing capacity on existing facilities | $ | 1,408 |  |  | $ | 2,903 |
Fair value of senior unsecured notes | $ | 13,881 |  |  | $ | 15,022 |
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. In March 2021 we repaid $750 of senior unsecured notes with a coupon of 2.625% that were due on March 15, 2021. In June 2021 we repaid the $400 term loan that was due on November 10, 2023.

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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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(c)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1E -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495348-112611 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 + Details
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