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Debt and Credit Facilities (Tables) | 12 Months Ended
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Dec. 31, 2016
Long-term Debt, Unclassified [Abstract] |
Maturities Of Long-Term Debt Disclosures |
Summary of Total Debt
Senior unsecured notes: | 2016 |  | 2015
| Rate |  | Due |  |  |  |
| 2.000% |  | 09/30/2016 |  | $ | — |  |  | $ | 749 |
| 1.300% |  | 04/01/2018 |  | 598 |  |  | 597 |
| 2.000% |  | 03/08/2019 |  | 746 |  |  | — |
| 4.375% |  | 01/15/2020 |  | 497 |  |  | 496 |
| 2.625% |  | 03/15/2021 |  | 745 |  |  | — |
| 3.375% |  | 05/15/2024 |  | 602 |  |  | 606 |
| 3.375% |  | 11/01/2025 |  | 744 |  |  | 744 |
| 3.500% |  | 03/15/2026 |  | 987 |  |  | — |
| 4.100% |  | 04/01/2043 |  | 391 |  |  | 390 |
| 4.375% |  | 05/15/2044 |  | 395 |  |  | 394 |
| 4.625% |  | 03/15/2046 |  | 979 |  |  | — |
Commercial paper |  | 200 |  |  | — |
Other |  | 30 |  |  | 22 |
Total debt |  | $ | 6,914 |  |  | $ | 3,998 |
Less current maturities |  | 228 |  |  | 768 |
Total long-term debt |  | $ | 6,686 |  |  | $ | 3,230 |
Unamortized debt issuance costs | $ | 45 |  |  | $ | 24 |
Available borrowing capacity under all existing facilities | $ | 1,551 |  |  | $ | 1,236 |
Fair value of debt |  | $ | 6,762 |  |  | $ | 4,009 |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 + Details
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