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Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Offsetting of Derivative Assets (Details) - USD ($) $ in Millions		Sep. 30, 2018	Sep. 30, 2017
Offsetting Assets [Line Items]
Commodity derivatives not subject to master netting or similar arrangement	[1]		$ 10
Letter of Credit
Offsetting Assets [Line Items]
Amount of letters of credit outstanding		$ 900	$ 1,200
Other Contract
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets, subject to master netting or similar arrangements		72
Net Amounts of Assets Presented in the Balance Sheet	[1]	$ 72
[1] There are no derivative contracts subject to a master netting arrangement or similar agreement which are not offset in the consolidated balance sheets.

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- Definition

Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, not subject to a master netting arrangement.

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