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Asset Retirement Obligations (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 31, 2013
Asset Retirement Obligations  
Asset retirement obligations, period increase (decrease) $ 42
Accretion expense 10
Balance at September 30, 2013 3,488 [1]
Settlements (ash storage areas) (4) [1]
Accretion (recorded as regulatory asset) 46 [1]
Balance at December 31, 2013 3,530 [1]
Current portion of ARO 30
Nuclear
  
Asset Retirement Obligations  
Balance at September 30, 2013 2,399 [1]
Settlements (ash storage areas) 0 [1]
Accretion (recorded as regulatory asset) 33 [1]
Balance at December 31, 2013 2,432 [1]
Non-nuclear
  
Asset Retirement Obligations  
Balance at September 30, 2013 1,089 [1]
Settlements (ash storage areas) (4) [1]
Accretion (recorded as regulatory asset) 13 [1]
Balance at December 31, 2013 $ 1,098 [1]
[1] The current portion of ARO in the amount of $30 million is included in Accounts payable and accrued liabilities at December 31, 2013.