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Asset Retirement Obligations (Details) - USD ($)
$ in Millions
 9 Months Ended
Jun. 30, 2016
Sep. 30, 2015
Asset Retirement Obligations    
Asset retirement obligations, period increase $ 164  
Decommissioning study update - ARO nuclear 5 years  
Amortization expense of related regulatory assets $ 108  
Balance at September 30, 2015 3,843  
Settlements (82)  
Change in Estimate 119  
Additional obligations 15  
Accretion (recorded as regulatory asset) 112  
Balance at June 30, 2016 [1] 4,007  
Current portion of ARO 192 $ 161
Nuclear    
Asset Retirement Obligations    
Balance at September 30, 2015 2,187  
Settlements 0  
Change in Estimate 198  
Additional obligations 0  
Accretion (recorded as regulatory asset) 79  
Balance at June 30, 2016 2,464  
Non-nuclear    
Asset Retirement Obligations    
Balance at September 30, 2015 1,656  
Settlements (82)  
Change in Estimate (79)  
Additional obligations 15  
Accretion (recorded as regulatory asset) 33  
Balance at June 30, 2016 $ 1,543  
[1] The current portion of ARO in the amount of $192 million and $161 million is included in Accounts payable and accrued liabilities at June 30, 2016 and