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Risk Management Activities and Derivative Transactions Offsetting for Derivative Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Sep. 30, 2016
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities $ 1,687 $ 2,145
Gross Amounts Offset in the Balance Sheet [1] (15) (36)
Net Amounts of Liabilities Presented in the Balance Sheet [2] 1,787 2,243
Commodity derivatives not subject to master netting or similar arrangement [2] 115 134
Total 1,802 2,279
Forward Contract Derivative Asset, at Fair Value 14 15
Currency Swap    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities [3] 170 162
Gross Amounts Offset in the Balance Sheet [1],[3] 0 0
Net Amounts of Liabilities Presented in the Balance Sheet [2],[3] 170 162
Interest Rate Contract    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities [3] 1,497 1,938
Gross Amounts Offset in the Balance Sheet [1],[3] 0 0
Net Amounts of Liabilities Presented in the Balance Sheet [2],[3] 1,497 1,938
Commodity derivatives under FTP    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities 20 45
Gross Amounts Offset in the Balance Sheet [1] (15) (36)
Net Amounts of Liabilities Presented in the Balance Sheet [2] 5 9
Total derivatives subject to master netting or similar arrangement    
Offsetting Liabilities [Line Items]    
Net Amounts of Liabilities Presented in the Balance Sheet [2] 1,672 2,109
Letter of Credit    
Offsetting Liabilities [Line Items]    
Amount of letters of credit outstanding 1,135 1,400
Fair Value, Inputs, Level 2    
Offsetting Liabilities [Line Items]    
Forward Contract Derivative Asset, at Fair Value $ 14 $ 15
[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 that are not offset in the consolidated balance sheets.
[3] Letters of credit of approximately $1.1 billion and $1.4 billion were posted as collateral at December 31, 2016, and September 30, 2016, 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.