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Asset Retirement Obligations (Details)
$ in Millions
 3 Months Ended
Dec. 31, 2015
USD ($)
Asset Retirement Obligations  
Asset retirement obligations, period increase (decrease) $ (8)
Decommissioning study update - ARO nuclear 5 years
Accretion expense $ 36
Balance at September 30, 2015 3,843 [1]
Settlements (22) [1]
Asset Retirement Obligation, Revision of Estimate (7) [1]
Accretion (recorded as regulatory asset) 37 [1]
Balance at December 31, 2015 3,851 [1]
Current portion of ARO 183
Nuclear  
Asset Retirement Obligations  
Balance at September 30, 2015 2,187 [1]
Settlements 0 [1]
Asset Retirement Obligation, Revision of Estimate 0 [1]
Accretion (recorded as regulatory asset) 26 [1]
Balance at December 31, 2015 2,213 [1]
Non-nuclear  
Asset Retirement Obligations  
Balance at September 30, 2015 1,656 [1]
Settlements (22) [1]
Asset Retirement Obligation, Revision of Estimate (7) [1]
Accretion (recorded as regulatory asset) 11 [1]
Balance at December 31, 2015 $ 1,638 [1]
[1] The current portion of ARO in the amount of $183 million is included in Accounts payable and accrued liabilities at December 31, 2015.