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Long-Term Debt (Details 1) (USD $)
In Millions, unless otherwise specified
3 Months Ended3 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Tax-Exempt Revenue Bonds1 [Member]
Sep. 30, 2011
Tax-Exempt Revenue Bonds1 [Member]
Sep. 30, 2011
Tax-Exempt Revenue Bonds2 [Member]
Sep. 30, 2011
Tax-Exempt Revenue Bonds3 [Member]
Sep. 30, 2011
Tax Exempt Revenue Bonds 5 [Member]
Jun. 30, 2011
Senior Notes2 [Member]
Sep. 30, 2011
Tax-Exempt Revenue Bonds4 [Member]
Extinguishment of Debt [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.95%2.13%5.65%5.65%5.55%7.05%5.45%
Extinguishment of Debt, Amount$ 991$ 26 $ 67$ 40$ 118$ 600$ 140