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Note 12 - Notes Payable - Senior Unsecured Notes Issuance (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Senior Unsecured Notes 1 [Member] |
Maturity Date | Feb. 28, 2025
Amount Issued | $ 500
Interest Rate | 3.30%
Senior Unsecured Notes 2 [Member] |
Maturity Date | Sep. 30, 2047
Amount Issued | $ 350
Interest Rate | 4.45%
Senior Unsecured Notes 3 [Member] |
Maturity Date | Apr. 30, 2027
Amount Issued | $ 400
Interest Rate | 3.80%
Senior Unsecured Notes 4 [Member] |
Maturity Date | Mar. 31, 2024
Amount Issued | $ 400
Interest Rate | 2.70%
Senior Unsecured Notes 5 [Member] |
Maturity Date | Dec. 31, 2046
Amount Issued | $ 350
Interest Rate | 4.125%
Senior Unsecured Notes 6 [Member] |
Maturity Date | Oct. 31, 2026
Amount Issued | $ 500
Interest Rate | 2.80%
Senior Unsecured Notes 7 [Member] |
Maturity Date | Apr. 30, 2045
Amount Issued | $ 150
Interest Rate | 4.25%

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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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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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