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Fair Value Measurements Investments Gains (Losses) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Investment Gains (Losses)        
Securities classified as trading and measured at fair value $ 2,100   $ 2,100  
NDT unfunded commitments related to private partnerships 76   76  
Nuclear Decommissioning Fund Investments, Fair Value 1,600   1,600  
Decommissioning Fund Investments, Fair Value 449   449  
SERP        
Investment Gains (Losses)        
Unrealized gains (losses) on investments 0 $ 1 0 $ 0
LTDCP        
Investment Gains (Losses)        
Unrealized gains (losses) on investments 0 0 0 (1)
NDT        
Investment Gains (Losses)        
Unrealized gains (losses) on investments 9 11 48 34
ART        
Investment Gains (Losses)        
Unrealized gains (losses) on investments (3) $ 9 9 $ 15
Maximum        
Investment Gains (Losses)        
Equity investments not required to be measured at fair value $ 1   $ 1