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Risk Management Activities and Derivative Transactions Offsetting of Derivative Assets (Details) - USD ($) $ in Millions	Jun. 30, 2020	Sep. 30, 2019
Offsetting Assets [Line Items]
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	$ 2,412	$ 2,025
Gross amounts of recognized liabilities	2,372	1,972
Total derivatives not subject to master netting or similar arrangement	10	12
Forward Contract Derivative Asset, at Fair Value	11	22
Derivative Liability, Not Subject to Master Netting Arrangement	40	53
Letter of Credit
Offsetting Assets [Line Items]
Amount of letters of credit outstanding for credit facilities	1,510	1,300
Currency Swap
Offsetting Assets [Line Items]
Gross amounts of recognized liabilities	264	208
Interest Rate Contract
Offsetting Assets [Line Items]
Gross amounts of recognized liabilities	2,108	1,764
Fair Value, Inputs, Level 2
Offsetting Assets [Line Items]
Forward Contract Derivative Asset, at Fair Value	$ 11	$ 22

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