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Asset Retirement Obligations Asset Retirement Obligations (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Asset Retirement Obligations    
Increase in ARO liability $ (319)  
Initial decommissioning estimate for nuclear 7 years  
ARO-Nuclear Decommissioning Study Update 5 years  
Accretion expense 40  
Balance 3,488 [1] 3,289 [1]
Settlements (ash storage areas) (14) [1] (37) [1]
Asset Retirement Obligation, Revision of Estimate (Site Specific Studies) (472) [1]  
Change in estimate (10) [1] (66) [1]
Accretion (recorded as regulatory asset) 177 [1] 170 [1]
Balance 3,169 [1] 3,488 [1]
Current portion of ARO 80  
Nuclear
    
Asset Retirement Obligations    
Balance 2,399 [1] 2,208 [1]
Settlements (ash storage areas) 0 [1] 0 [1]
Asset Retirement Obligation, Revision of Estimate (Site Specific Studies) (472) [1]  
Change in estimate 0 [1] (66) [1]
Accretion (recorded as regulatory asset) 125 [1] 125 [1]
Balance 2,052 [1] 2,399 [1]
Non-nuclear
    
Asset Retirement Obligations    
Balance 1,089 [1] 1,081 [1]
Settlements (ash storage areas) (14) [1] (37) [1]
Asset Retirement Obligation, Revision of Estimate (Site Specific Studies) 0 [1]  
Change in estimate (10) [1] 0 [1]
Accretion (recorded as regulatory asset) 52 [1] 45 [1]
Balance $ 1,117 [1] $ 1,089 [1]
[1] The current portion of ARO in the amount of $80 million is included in Accounts payable and accrued liabilities.