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Risk Management Activities and Derivative Transactions Offsetting for Derivative Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Sep. 30, 2018
Offsetting Liabilities [Line Items]    
Total derivatives not subject to master netting or similar arrangement [1] $ 42  
Gross amounts of recognized liabilities 1,531 $ 1,293
Gross Amounts Offset in the Balance Sheet [2] 0 0
Net Amounts of Liabilities Presented in the Balance Sheet [1] 1,545 1,305
Commodity derivatives not subject to master netting or similar arrangement [1] 14 12
Total 1,545 1,305
Forward Contract Derivative Asset, at Fair Value 59 45
Currency Swap    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities 123 94 [3]
Gross Amounts Offset in the Balance Sheet 0 0 [2],[3]
Net Amounts of Liabilities Presented in the Balance Sheet [1],[3] 123 94
Interest Rate Contract    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities 1,408 1,199 [3]
Gross Amounts Offset in the Balance Sheet 0 0 [2],[3]
Net Amounts of Liabilities Presented in the Balance Sheet [1],[3] 1,408 1,199
Total derivatives subject to master netting or similar arrangement    
Offsetting Liabilities [Line Items]    
Net Amounts of Liabilities Presented in the Balance Sheet [1] 1,531 1,293
Letter of Credit    
Offsetting Liabilities [Line Items]    
Amount of letters of credit outstanding 932 900
Fair Value, Inputs, Level 2    
Offsetting Liabilities [Line Items]    
Forward Contract Derivative Asset, at Fair Value $ 59 $ 45
[1] There are no derivative contracts subject to a master netting arrangement or similar agreement that are not offset in the Consolidated Balance Sheets.
[2] 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.
[3] Letters of credit of approximately $932 million and $921 million were posted as collateral at March 31, 2019, and September 30, 2018, 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.