v2.4.0.6

Debt And Related Expenses (Narrative) (Details) | 1 Months Ended |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2011 USD ($) | Jun. 30, 2009 USD ($) | Jun. 30, 2009 CAD | Dec. 31, 2011 USD ($) | Jun. 29, 2010 | Dec. 31, 2011 Current Borrowing Capacity [Member] USD ($) | Dec. 31, 2011 Minimum [Member] | Dec. 31, 2011 Maximum [Member] | Dec. 31, 2011 Maximum [Member] Commercial Paper General Maturity Maximum [Member] | Jan. 31, 2009 Senior Notes Due January 15, 2014 [Member] USD ($) | Dec. 31, 2011 Line Of Credit Facility [Member] USD ($) | Dec. 31, 2011 Senior Credit Facility Due April 7,2012 [Member] USD ($) | Dec. 31, 2011 Senior Credit Facility Due April 7,2013[Member] USD ($) | Dec. 31, 2011 Canadian Subfacility [Member] USD ($)
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 |  |  |  |

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