Quarterly report pursuant to Section 13 or 15(d)

Borrowings (Short-term Debt) (Details Textual)

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Borrowings (Short-term Debt) (Details Textual) (USD $)
1 Months Ended 3 Months Ended 6 Months Ended 53 Months Ended
Apr. 30, 2012
Mar. 31, 2012
Aug. 31, 2012
Aug. 31, 2012
Sep. 01, 2016
Feb. 29, 2012
Borrowings (Textual)            
Maximum borrowing amount under credit facility     $ 2,225,000,000 $ 2,225,000,000    
Derivative, Description of variable rate basis one-month LIBOR base rate three-month LIBOR base rate        
Interest rate swap agreements designated as cash flow hedges 500,000,000   500,000,000 500,000,000   500,000,000
Undesignated interest rate swap agreements 500,000,000   1,000,000,000 1,000,000,000   0
Derivative fixed average interest rate         2.80%  
Cash flow hedge loss reclassified to Interest Expense, net     (2,000,000) (4,100,000)    
Sub-facility Letters of Credit [Member]
           
Borrowings (Textual)            
Maximum borrowing amount under credit facility     200,000,000 200,000,000    
Letters of credit outstanding, Amount     15,400,000 15,400,000    
Revolving Credit Facility [Member]
           
Borrowings (Textual)            
Maximum borrowing amount under credit facility     850,000,000 850,000,000    
Debt instrument, Maturity date       May 03, 2017    
LIBOR margin     1.75% 1.75%    
Remaining borrowing capacity     $ 834,600,000 $ 834,600,000