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Supplemental Cash Flow Information Supplemental Cash Flow Information (Details) (USD $)
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Supplemental Cash Flow Information      
Interest paid $ 1,300,000,000 $ 1,400,000,000 $ 1,400,000,000
Interest capitalized 168,000,000 171,000,000 126,000,000
Payments to Acquire Other Productive Assets 162,000,000 212,000,000 199,000,000
Accounts payable and accrued liabilities
      
Supplemental Cash Flow Information      
Construction in progress and Nuclear fuel expenditures $ 270,000,000 $ 204,000,000 $ 307,000,000