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Debt And Related Expenses (Narrative) (Details)
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1 Months Ended | 1 Months Ended | 12 Months Ended | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jul. 31, 2011
USD ($)
|
Jun. 30, 2009
USD ($)
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Jun. 30, 2009
CAD
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Dec. 31, 2011
USD ($)
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Jun. 29, 2010
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Dec. 31, 2011
Current Borrowing Capacity [Member]
USD ($)
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Dec. 31, 2011
Minimum [Member]
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Dec. 31, 2011
Maximum [Member]
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Dec. 31, 2011
Maximum [Member]
Commercial Paper General Maturity Maximum [Member]
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Jan. 31, 2009
Senior Notes Due January 15, 2014 [Member]
USD ($)
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Dec. 31, 2011
Line Of Credit Facility [Member]
USD ($)
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Dec. 31, 2011
Senior Credit Facility Due April 7,2012 [Member]
USD ($)
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Dec. 31, 2011
Senior Credit Facility Due April 7,2013[Member]
USD ($)
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Dec. 31, 2011
Canadian Subfacility [Member]
USD ($)
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| Debt Instrument [Line Items] | ||||||||||||||
| Senior credit facility, borrowing capacity | $ 2,650,000,000 | $ 460,000,000 | $ 2,190,000,000 | $ 500,000,000 | ||||||||||
| Senior credit facility, expiration date | April 7, 2012 | April 7, 2013 | ||||||||||||
| Annual facility fee | 1,900,000 | |||||||||||||
| Outstanding senior credit facility borrowings | 0 | |||||||||||||
| Ratio of total funded debt to total capitalization to be less than | 65.00% | |||||||||||||
| Debt-to-capitalization ratio, current percentage | 22.8 | |||||||||||||
| Commercial paper program, borrowing capacity | 5,000,000,000 | |||||||||||||
| Commercial paper maturity (days) | 1 | 365 | 90 | |||||||||||
| Average borrowing rate on commercial paper borrowings | 0.45% | |||||||||||||
| Issuance of non interest bearing promissory note | 155,000,000 | |||||||||||||
| Present value of promissory note | 139,000,000 | |||||||||||||
| Debt instrument, interest rate, effective percentage | 3.125% | |||||||||||||
| Non-interest bearing promissory note carrying value | 85,000,000 | |||||||||||||
| Commercial Paper | 3,726,000,000 | |||||||||||||
| Senior notes | $ 2,250,000,000 | $ 1,200,000 | ||||||||||||