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Risk Management Activities and Derivative Transactions Offsetting of Derivative Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Sep. 30, 2016
Offsetting Assets [Line Items]    
Gross Amounts Offset in the Balance Sheet [1]   $ (6)
Net Amounts of Assets Presented in the Balance Sheet [2]   9
Total derivatives not subject to master netting or similar arrangement [2] $ 28 9
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement   15
Letter of Credit    
Offsetting Assets [Line Items]    
Amount of letters of credit outstanding for credit facilities $ 1,135 1,400
Commodity derivatives under FTP    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets   6
Gross Amounts Offset in the Balance Sheet [1]   (6)
Net Amounts of Assets Presented in the Balance Sheet [2]   $ 0
[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.