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Risk Management Activities and Derivative Transactions Offsetting of Derivative Assets and Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Sep. 30, 2013
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets $ 127 $ 162
Gross Amounts Offset in the Balance Sheet (111) [1] (131) [1]
Net Amounts of Assets Presented in the Balance Sheet 21 [2] 34 [2]
Total derivatives not subject to master netting or similar arrangement 5 [2] 3 [2]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement 132 165
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities (1,437) (1,481)
Gross Amounts Offset in the Balance Sheet 112 [1] 198 [1]
Net Amounts of Liabilities Presented in the Balance Sheet (1,480) [2] (1,427) [2]
Total derivatives not subject to master netting or similar arrangement (155) [2] (144) [2]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement 1,592 1,625
Letter of Credit
    
Offsetting Liabilities [Line Items]    
Amount of letters of credit outstanding 900 800
Currency Swap [Member]
    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 71 61
Gross Amounts Offset in the Balance Sheet (56) [1] (33) [1]
Net Amounts of Assets Presented in the Balance Sheet 15 [2] 28 [2]
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities (2) [3] (15) [3]
Gross Amounts Offset in the Balance Sheet 0 [1],[3] 0 [1],[3]
Net Amounts of Liabilities Presented in the Balance Sheet (2) [2],[3] (15) [2],[3]
Interest Rate Contract [Member]
    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities (1,289) [3] (1,199) [3]
Gross Amounts Offset in the Balance Sheet 0 [1],[3] 0 [1],[3]
Net Amounts of Liabilities Presented in the Balance Sheet (1,289) [2],[3] (1,199) [2],[3]
Commodity derivatives under FTP
    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 56 101
Gross Amounts Offset in the Balance Sheet (55) [1] (98) [1]
Net Amounts of Assets Presented in the Balance Sheet 1 [2] 3 [2]
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities (146) (267)
Gross Amounts Offset in the Balance Sheet 112 [1] 198 [1]
Net Amounts of Liabilities Presented in the Balance Sheet (34) [2] (69) [2]
Total derivatives subject to master netting or similar arrangement [Member]
    
Offsetting Assets [Line Items]    
Net Amounts of Assets Presented in the Balance Sheet 16 [2] 31 [2]
Offsetting Liabilities [Line Items]    
Net Amounts of Liabilities Presented in the Balance Sheet $ (1,325) [2] $ (1,283) [2]
[1] Amounts primarily include counterparty netting of derivative contracts, margin account deposits for futures commission merchants transactions, and cash collateral received or paid in accordance with the accounting guidance for derivatives and hedging transactions.
[2] There are no derivative contracts subject to a master netting arrangement or similar agreement which are not offset in the balance sheets.
[3] Letters of credit of approximately $900 million and $800 million were posted as collateral at June 30, 2014 and September 30, 2013, respectively, to partially secure the liability positions of one of the currency swaps and one of the interest rate swaps in accordance with the collateral requirements for these derivatives.