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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, 2019 | Sep. 30, 2018
--- | --- | ---
Offsetting Liabilities [Line Items] |  |  |  |
Gross Amounts of Recognized Liabilities, subject to master netting or similar arrangements |  | $ 1,972 | $ 1,293 |
Gross Amounts Offset in the Balance Sheet | [1] | 0 | 0 |
Derivative Liability | [2] | 2,025 | 1,305 |
Total derivatives not subject to master netting or similar arrangement | [2] | 53 | 12 |
Total |  | 2,025 | 1,305 |
Currency Swap |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross Amounts of Recognized Liabilities, subject to master netting or similar arrangements |  | 208 | 94 | [3]
Gross Amounts Offset in the Balance Sheet |  | 0 | 0 | [1],[3]
Derivative Liability | [2],[3] | 208 | 94 |
Interest Rate Contract |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Gross Amounts of Recognized Liabilities, subject to master netting or similar arrangements |  | 1,764 | 1,199 | [3]
Gross Amounts Offset in the Balance Sheet |  | 0 | 0 | [1],[3]
Derivative Liability | [2],[3] | 1,764 | 1,199 |
Total derivatives subject to master netting or similar arrangement |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Derivative Liability | [2] | 1,972 | 1,293 |
Letter of Credit |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |
Amount of letters of credit outstanding |  | $ 1,300 | $ 900 |
[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 on the Consolidated Balance Sheets.
[3] | Letters of credit of approximately $1.3 billion and $921 million were posted as collateral at September 30, 2019 and 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.

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