Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Balance Type:	credit
Period Type:	instant

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

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- 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.

+ Details

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Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	instant

- Definition

Weighted average interest rate of short-term debt outstanding calculated over time.

+ References

No definition available.

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- Definition

For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

+ References

No definition available.

+ Details

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Long-Term Debt (Details) - USD ($)	3 Months Ended
Long-Term Debt (Details) - USD ($)	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Borrowings Outstanding	$ 0		$ 0
Average Outstanding Amount	$ 18,000,000	$ 0
Weighted average interest rate (in hundredths)	1.76%
Uncommitted Credit Facility [Member]
Line of Credit Facility [Line Items]
Borrowings Outstanding	$ 0		0
Revolving Credit Agreement 2020 [Member]
Line of Credit Facility [Line Items]
Borrowings Outstanding	0		$ 0
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,000,000,000
Line of Credit Facility, Expiration Date	Jul. 21, 2020
Eurodollar [Member]
Line of Credit Facility [Line Items]
Weighted average interest rate (in hundredths)	2.88%
Base Rate [Member]
Line of Credit Facility [Line Items]
Weighted average interest rate (in hundredths)	4.75%