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Asset Retirement Obligations (Details)
$ in Millions
 6 Months Ended
Mar. 31, 2016
USD ($)
Asset Retirement Obligations  
Asset retirement obligations, period decrease $ 35
Decommissioning study update - ARO nuclear 5 years
Accretion expense $ 72
Balance at September 30, 2015 3,843
Settlements (48)
Change in Estimate (76)
Additional obligations 15
Accretion (recorded as regulatory asset) 74
Balance at March 31, 2016 3,808 [1]
Current portion of ARO 187
Nuclear  
Asset Retirement Obligations  
Balance at September 30, 2015 2,187
Settlements 0
Change in Estimate 0
Additional obligations 0
Accretion (recorded as regulatory asset) 52
Balance at March 31, 2016 2,239
Non-nuclear  
Asset Retirement Obligations  
Balance at September 30, 2015 1,656
Settlements (48)
Change in Estimate (76)
Additional obligations 15
Accretion (recorded as regulatory asset) 22
Balance at March 31, 2016 $ 1,569
[1] The current portion of ARO in the amount of $187 million is included in Accounts payable and accrued liabilities at March 31, 2016.