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Fair Value Measurements Investments Gains (Losses) (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Investment Gains (Losses)    
Securities classified as trading and measured at fair value $ 2,100  
NDT unfunded commitments related to private partnerships 79  
Nuclear Decommissioning Fund Investments, Fair Value 1,500  
Decommissioning Fund Investments, Fair Value 449  
SERP    
Investment Gains (Losses)    
Unrealized gains (losses) on investments 0 $ (1)
LTDCP    
Investment Gains (Losses)    
Unrealized gains (losses) on investments 0 (1)
NDT    
Investment Gains (Losses)    
Unrealized gains (losses) on investments 39 23
ART    
Investment Gains (Losses)    
Unrealized gains (losses) on investments 12 $ 6
Maximum    
Investment Gains (Losses)    
Derivative Credit Risk Valuation Adjustment, Derivative Assets 1  
Equity investments not required to be measured at fair value $ 1