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Long-Term Debt and Credit Facilities - Debt Issuances (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017
Five Year Notes at 2.25 Percent |  |
Schedule of U.S. dollar and Euro denominated notes [Line Items] |  |
Face amount | $ 400 |
Notes, term | 5 years |
Fixed interest rate | 2.25% |
Thirty Year Notes at 3.70 Percent |  |
Schedule of U.S. dollar and Euro denominated notes [Line Items] |  |
Face amount |  | $ 500
Notes, term |  | 30 years
Fixed interest rate |  | 3.70%

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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