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Short And Long-Term Debt Unsecured Notes (Details) - Senior Notes	Mar. 31, 2018
4.50% Senior Notes
Debt Instrument [Line Items]
Interest Rate	4.50%
5.25% Senior Notes
Debt Instrument [Line Items]
Interest Rate	5.25%
4.875% Senior Notes
Debt Instrument [Line Items]
Interest Rate	4.875%

X

- 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

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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