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Risk Management Activities and Derivative Transactions Offsetting for Derivative Liabilities (Details) $ in Millions	Jun. 30, 2020 USD ($)	Sep. 30, 2019 USD ($) Bond_issues
Offsetting Liabilities [Line Items]
Number of currency swaps outstanding | Bond_issues		3
Accounts Receivable, before Allowance for Credit Loss, Current	$ 1,286	$ 1,624
Total derivatives not subject to master netting or similar arrangement	10	12
Gross amounts of recognized liabilities	2,372	1,972
Derivative Liability, Not Subject to Master Netting Arrangement	40	53
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	2,412	2,025
Forward Contract Derivative Asset, at Fair Value	11	22
Currency Swap
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	264	208
Interest Rate Contract
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	2,108	1,764
Letter of Credit
Offsetting Liabilities [Line Items]
Amount of letters of credit outstanding	1,510	1,300
Fair Value, Inputs, Level 2
Offsetting Liabilities [Line Items]
Forward Contract Derivative Asset, at Fair Value	$ 11	$ 22

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