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Debt Obligations (Details) (USD $)
1 Months Ended9 Months Ended1 Months Ended9 Months Ended
May 31, 2011
Sep. 30, 2011
Sep. 30, 2011
Line Of Credit Maturity July 20, 2012 [Member]
Financing [Member]
Sep. 30, 2011
Line Of Credit Maturity October 27, 2016 [Member]
Financing [Member]
May 31, 2011
4.65% Senior Notes Due June 1, 2021 [Member]
May 31, 2011
6.05% Senior Notes Due June 1, 2041 [Member]
Sep. 30, 2011
Financing [Member]
Senior notes, aggregate principal amount    $ 800,000,000$ 700,000,000 
Senior notes, interest rate    4.65%6.05% 
Senior Notes Maturity Date    June 1, 2021June 1, 2041 
Senior notes, net proceeds1,480,000,000      
Revolving credit facilities outstanding 574,600,000     
Amount available for future borrowings 1,400,000,000     
Letter of credit, amount 24,300,000     
Weighted average interest rate on the total amount outstanding 0.80%     
Line of Credit Facility, Current Borrowing Capacity      2,500,000,000
Line of credit facility maturity date  July 20, 2012October 27, 2016   
Maximum revolving credit capacity      $ 3,750,000,000
Line of credit facility obligation rate      1.50%
Line of Credit Facility, Commitment Fee Percentage      0.25%