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Other Long-Term Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Sep. 30, 2013
Other Long-Term Liabilities    
Interest rate swap liabilities $ 1,289 $ 1,199
Currency swap liabilities 2 15
Total other long-term liabilities 1,911 1,861
Other Noncurrent Liabilities [Member]
    
Other Long-Term Liabilities    
Interest rate swap liabilities 1,289 1,199
Environmental agreements liability 139 190
EnergyRight® purchase obligation 150 149
Coal contract derivative liabilities 53 35
Membership interests of VIE subject to mandatory redemption 37 38
Commodity swap derivative liabilities 18 36
Currency swap liabilities 2 15
Other 223 199
Accounts Payable and Accrued Liabilities [Member]
    
Other Long-Term Liabilities    
EnergyRight® purchase obligation $ 37 $ 37