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Supplemental Cash Flow Information Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Supplemental Cash Flow Information      
Interest paid $ 1,300 $ 1,300 $ 1,300
Interest capitalized 214 175 168
Bellefonte amounts included in Construction expenditures     162
Financing non-cash activity for capital leases   70 20
Accounts payable and accrued liabilities      
Supplemental Cash Flow Information      
Construction in progress and Nuclear fuel expenditures $ 530 $ 391 $ 270