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Asset Retirement Obligations (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Jun. 30, 2014
Asset Retirement Obligations  
Asset retirement obligations, period increase (decrease) $ 352
Initial decommissioning estimate for nuclear 7 years
Decommissioning study update - ARO nuclear 5 years
Accretion expense 30
Balance at September 30, 2013 3,488 [1]
Settlements (ash storage areas) (10) [1]
Change in estimate as a result of adoption of nuclear site-specific studies (471) [1]
Change in estimate (ash storage areas) (10) [1]
Accretion (recorded as regulatory asset) 139 [1]
Balance at June 30, 2014 3,136 [1]
Current portion of ARO 69
Nuclear
  
Asset Retirement Obligations  
Balance at September 30, 2013 2,399 [1]
Settlements (ash storage areas) 0 [1]
Change in estimate as a result of adoption of nuclear site-specific studies (471) [1]
Change in estimate (ash storage areas) 0
Accretion (recorded as regulatory asset) 100 [1]
Balance at June 30, 2014 2,028 [1]
Non-nuclear
  
Asset Retirement Obligations  
Balance at September 30, 2013 1,089 [1]
Settlements (ash storage areas) (10) [1]
Change in estimate as a result of adoption of nuclear site-specific studies 0 [1]
Change in estimate (ash storage areas) (10) [1]
Accretion (recorded as regulatory asset) 39 [1]
Balance at June 30, 2014 $ 1,108 [1]
[1] The current portion of ARO in the amount of $69 million is included in Accounts payable and accrued liabilities at June 30, 2014.