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Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Offsetting of Derivative Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities, subject to master netting or similar arrangements $ 1,293 $ 1,619
Gross Amounts Offset in the Balance Sheet [1] 0 4
Net Amounts of Liabilities Presented in the Balance Sheet [2] 1,305 1,685
Total derivatives not subject to master netting or similar arrangement [2] 12 70
Total 1,305 1,689
Currency Swap    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities, subject to master netting or similar arrangements 94 103 [3]
Gross Amounts Offset in the Balance Sheet 0 0 [1],[3]
Net Amounts of Liabilities Presented in the Balance Sheet [2],[3] 94 103
Interest Rate Contract    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities, subject to master netting or similar arrangements 1,199 1,511 [3]
Gross Amounts Offset in the Balance Sheet 0 0 [1],[3]
Net Amounts of Liabilities Presented in the Balance Sheet [2],[3] 1,199 1,511
Other Contract    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities, subject to master netting or similar arrangements   5
Gross Amounts Offset in the Balance Sheet [1]   4
Net Amounts of Liabilities Presented in the Balance Sheet [2]   1
Total derivatives subject to master netting or similar arrangement    
Offsetting Liabilities [Line Items]    
Net Amounts of Liabilities Presented in the Balance Sheet [2] 1,293 1,615
Letter of Credit    
Offsetting Liabilities [Line Items]    
Amount of letters of credit outstanding $ 900 $ 1,200
[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 consolidated balance sheets.
[3] Letters of credit of approximately $921 million and $1.2 billion were posted as collateral at September 30, 2018 and 2017, 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.