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LT Debt (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments [Text Block] | Long-term debt consists of the following at December 31:
|  | 2018 |  | 2017
Asset securitization program |  | $ | 810,000 |  |  | $ | 490,000 |
6.00% notes, due 2020 |  | 209,147 |  |  | 208,971 |
5.125% notes, due 2021 |  | 130,546 |  |  | 130,400 |
3.50% notes, due 2022 |  | 347,288 |  |  | 346,518 |
4.50% notes, due 2023 |  | 297,622 |  |  | 297,122 |
3.25% notes, due 2024 |  | 494,091 |  |  | 493,161 |
4.00% notes, due 2025 |  | 345,762 |  |  | 345,182 |
7.50% senior debentures, due 2027 |  | 109,776 |  |  | 109,694 |
3.875% notes, due 2028 |  | 494,095 |  |  | 493,563 |
Other obligations with various interest rates and due dates |  | 788 |  |  | 18,434 |
|  | $ | 3,239,115 |  |  | $ | 2,933,045 |
Schedule of Fair Value of Debt [Text Block] | The estimated fair market value of long-term debt at December 31, using quoted market prices, is as follows:
|  | 2018 |  | 2017
3.00% notes, due 2018 |  | $ | — |  |  | $ | 300,500 |
6.00% notes, due 2020 |  | 214,500 |  |  | 224,000 |
5.125% notes, due 2021 |  | 134,500 |  |  | 139,000 |
3.50% notes, due 2022 |  | 345,000 |  |  | 355,000 |
4.50% notes, due 2023 |  | 303,500 |  |  | 315,500 |
3.25% notes, due 2024 |  | 467,000 |  |  | 491,000 |
4.00% notes, due 2025 |  | 340,500 |  |  | 356,500 |
7.50% senior debentures, due 2027 |  | 128,000 |  |  | 138,500 |
3.875% notes, due 2028 |  | 458,500 |  |  | 501,000 |

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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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