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Supplemental Cash Flow Information Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Supplemental Cash Flow Information      
Interest paid $ 1,300 $ 1,300 $ 1,300
Interest capitalized 235 214 175
Capital lease obligations incurred 81   70
Acquisition of notes payable   78  
Accounts payable and accrued liabilities      
Supplemental Cash Flow Information      
Construction in progress and Nuclear fuel expenditures $ 526 530 $ 391
Maximum      
Supplemental Cash Flow Information      
Capital lease obligations incurred   $ 1