Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events (Details)

v2.4.0.6
Subsequent Events (Details) (USD $)
0 Months Ended
Apr. 26, 2012
Mar. 31, 2012
Dec. 31, 2011
Subsequent Events [Abstract]      
Credit facility, amount $ 1,750,000,000 $ 5,434,500,000 $ 5,447,000,000
Revolving loan amount $ 425,000,000