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Fair Value Measurements Investments Gains (Losses) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Investment Gains (Losses)        
Securities classified as trading and measured at fair value $ 2,100   $ 2,100  
Nuclear Decommissioning Fund Investments, Fair Value 1,600   1,600  
Decommissioning Fund Investments, Fair Value 455   455  
NDT unfunded commitments related to private partnerships 75   75  
SERP        
Investment Gains (Losses)        
Unrealized gains (losses) on investments 1 $ 0 1 $ 0
LTDCP        
Investment Gains (Losses)        
Unrealized gains (losses) on investments 0 0 0 (1)
NDT        
Investment Gains (Losses)        
Unrealized gains (losses) on investments 12 (19) 60 15
ART        
Investment Gains (Losses)        
Unrealized gains (losses) on investments 2 $ (3) 11 $ 12
Maximum        
Investment Gains (Losses)        
Equity investments not required to be measured at fair value $ 1   $ 1