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Risk Management Activities and Derivative Transactions Offsetting of Derivative Assets and Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Sep. 30, 2013
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets $ 152 $ 165
Gross Amounts Offset in the Balance Sheet (143) [1] (131) [1]
Net Amounts of Assets Presented in the Balance Sheet 9 [2] 34 [2]
Total derivatives not subject to master netting or similar arrangement 4 [2] 3 [2]
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities (1,424) (1,625)
Gross Amounts Offset in the Balance Sheet 152 [1] 198 [1]
Net Amounts of Liabilities Presented in the Balance Sheet (1,272) [2] (1,427) [2]
Total derivatives not subject to master netting or similar arrangement (150) [2] (144) [2]
Letter of Credit
    
Offsetting Liabilities [Line Items]    
Amount of letters of credit outstanding 800  
Currency Swap [Member]
    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 78 61
Gross Amounts Offset in the Balance Sheet (74) [1] (33) [1]
Net Amounts of Assets Presented in the Balance Sheet 4 [2] 28 [2]
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities (12) [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 (12) [2],[3] (15) [2],[3]
Interest Rate Contract [Member]
    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities (1,060) [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 (1,060) [2],[3] (1,199) [2],[3]
Commodity derivatives under FTP
    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 70 101
Gross Amounts Offset in the Balance Sheet (69) [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 (202) (267)
Gross Amounts Offset in the Balance Sheet 152 [1] 198 [1]
Net Amounts of Liabilities Presented in the Balance Sheet (50) [2] (69) [2]
Total derivatives subject to master netting or similar arrangement [Member]
    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 148 162
Gross Amounts Offset in the Balance Sheet (143) [1] (131) [1]
Net Amounts of Assets Presented in the Balance Sheet 5 [2] 31 [2]
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities (1,274) (1,481)
Gross Amounts Offset in the Balance Sheet 152 [1] 198 [1]
Net Amounts of Liabilities Presented in the Balance Sheet $ (1,122) [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 $800 million were posted as collateral at December 31, 2013 and September 30, 2013, to partially secure the liability positions of the currency swap and a certain interest rate swap in accordance with the collateral requirements for these derivatives.