The effective base interest rate at the end of the reporting period.

No definition available.

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- Details

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- Definition

The effective Eurodollar interest rate at the end of the reporting period.

+ References

No definition available.

+ Details

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- Definition

Short-Term Debt Repaid Subsequent to the Balance Sheet Date

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

Reflects the calculation for the reporting period of the average interest rate on comemrcial paper weighted by the amount of commercial paper outstanding for varing time periods during the period.

+ References

No definition available.

+ 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: 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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- 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: 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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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the credit facility terminates, 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 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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Balance Type:	na
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- Details

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Balance Type:	na
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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Balance Type:	credit
Period Type:	instant

- Definition

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Balance Type:	debit
Period Type:	instant

- 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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- Definition

Amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1927-112601

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Long-Term Debt (Details) In Millions, unless otherwise specified		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 Commercial Paper [Member] USD ($)	Sep. 30, 2013 Revolving Credit Agreement [Member] USD ($)	Sep. 30, 2013 Canadian Dollar Letter of Credit Due 2014 [Member] USD ($)	Sep. 30, 2013 Canadian Dollar Letter of Credit Due 2014 [Member] CAD	Sep. 30, 2013 Floating Rate Senior Notes Due 2014 [Member] USD ($)	Sep. 30, 2013 4.75% Subsidiary Debt Due 2014 [Member] USD ($)	Sep. 30, 2013 6.125% Senior Notes Due 2013 [Member] USD ($)
Debt Instrument Issuance [Abstract]
Short-Term Debt, Refinanced Amount						$ 350	$ 150
Debt Instrument Issuance Interest Rate	4.75%						4.75%	6.125%
Debt Instrument, Maturity Date								Oct. 01, 2013
Short-Term Debt Repaid Subsequent to the Balance Sheet Date								400
Line of Credit Facility [Line Items]
Average Borrowings Outstanding		23
Weighted average interest rate (in hundredths)		0.30%
Line of Credit Facility, Expiration Date			Oct. 11, 2016	May 29, 2018	May 29, 2018
Restricted Cash				68	70
Maximum borrowing capacity			$ 2.0		160.0
Eurodollar rate at period end (in hundredths)			1.05%
Base rate at period end (in hundredths)			3.25%