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Debt and Credit Facilities (Tables) | 12 Months Ended
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Dec. 31, 2017
Long-term Debt, Unclassified [Abstract] |
Maturities Of Long-Term Debt Disclosures |
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 |

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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=84159872&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=75038535&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=84159872&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=84159872&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=84159872&loc=d3e21521-112644 + Details
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