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Fair Value Measurements Fair Value Measurements Using Significant Unobservable Inputs (Details) (USD $)
 3 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Mar. 31, 2014
Sep. 30, 2013
Mar. 31, 2013
Sep. 30, 2012
ASSETS                
Commodity contract derivatives $ 5,000,000   $ 5,000,000     $ 3,000,000    
Liabilities                
Commodity contract derivatives 155,000,000   155,000,000     144,000,000    
Number of contracts 1   1          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Amount of gain (loss) recognized in income 0   0          
Partnership Interest
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Balance 188,000,000 150,000,000 188,000,000 150,000,000 180,000,000 159,000,000 137,000,000 53,000,000
Purchases 7,000,000 9,000,000 23,000,000 93,000,000        
Issuances 0 0 0 0        
Sales (6,000,000) (1,000,000) 7,000,000 3,000,000        
Settlements 0 0 0 0        
Net unrealized gains (losses) deferred as regulatory assets and liabilities 7,000,000 5,000,000 (13,000,000) (7,000,000)        
Commodity Contract Derivatives
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Balance (146,000,000) (109,000,000) (146,000,000) (109,000,000) (131,000,000) (140,000,000) (148,000,000) (267,000,000)
Purchases 0 0 0 0        
Issuances 0 0 0 0        
Sales 0 0 0 0        
Settlements 0 0 0 0        
Net unrealized gains (losses) deferred as regulatory assets and liabilities 15,000,000 39,000,000 6,000,000 (158,000,000)        
Maximum
                
ASSETS                
Fair value inputs, counterparty credit risk     26.00% [1]          
Fair value measurements tons per year 1,100,000,000   1,100,000,000          
Price per ton 67.07   67.07          
Liabilities                
Fair value measurements tons per year 1,100,000,000   1,100,000,000          
Price per ton 67.07   67.07          
Minimum
                
ASSETS                
Fair value inputs, counterparty credit risk     26.00% [1]          
Fair value measurements tons per year 900,000,000   900,000,000          
Price per ton 12.00   12.00          
Liabilities                
Fair value measurements tons per year 900,000,000   900,000,000          
Price per ton 12.00   12.00          
Fair Value, Inputs, Level 3
                
ASSETS                
Commodity contract derivatives 5,000,000   5,000,000     3,000,000    
Liabilities                
Commodity contract derivatives $ 151,000,000   $ 151,000,000     $ 143,000,000    
[1] Applies to only one contract.