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Debt (Revolving Credit Facility And Commercial Paper) (Details) (USD $)
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12 Months Ended | 3 Months Ended | ||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2011
$800 Million Credit Facility [Member]
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Dec. 31, 2010
Syndicated Revolving Credit Facility [Member]
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| Amount available for borrowing | $ 800,000,000 | $ 665,000,000 | ||
| Amount available for borrowing | 1,250,000,000 | |||
| Maximum amount of letters of credit issuable under the facility | 100,000,000 | |||
| Revolving credit facility expiration date | December 2, 2016 | 11/1/2012 | ||
| Outstanding commercial paper obligations | 0 | 34,000,000 | ||
| Line of Credit Facility, Competitive Bid Loans, Max | 500,000,000 | |||
| Standby letters of credit outstanding | $ 46,500,000 |
| X | ||||||||||
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- Definition
Maximum amount of standby letters of credit that the company can issue under the financing facility. No definition available.
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- Definition
Line of Credit Facility, Competitive Bid Loans, Max No definition available.
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- Definition
Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. No definition available.
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- Definition
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
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| X | ||||||||||
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- Definition
Reflects when the credit facility terminates, which may be presented in a variety of ways (year, month and year, day, month and year, quarter). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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