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Note 4 - Debt (Details Textual) - USD ($) $ in Millions | Jul. 20, 2016 | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015
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Amended Credit Facility [Member] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 2,000 |  |
1.50% Due May 8, 2018 [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 375
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 1.50%
2.90% Due May 15, 2022 [Member] | Senior Notes [Member] |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 375
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 2.90%
Long-term Debt and Capital Lease Obligations |  | 3,918 | $ 3,890 |
Debt Instrument, Fair Value Disclosure |  | 4,300 | $ 4,100 |
Increase (Decrease) to Commercial Paper Maximum Capacity | $ 1,000 |  |  |
Commercial Paper, Maximum Borrowing Capacity | $ 2,000 |  |  |
Commercial Paper |  | $ 252 |  |

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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + 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(19)(a)(3)) -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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: 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 2: 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 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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