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Risk Management Activities and Derivative Transactions Offsetting for Derivative Liabilities (Details) $ in Millions	Mar. 31, 2022 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 Bond_issues
Offsetting Liabilities [Line Items]
Number of currency swaps outstanding | Bond_issues			2
Accounts Receivable, before Allowance for Credit Loss, Current	$ 1,277	$ 1,480
Total derivatives not subject to master netting or similar arrangement	209	250
Gross amounts of recognized liabilities	1,468	1,725
Derivative Liability, Not Subject to Master Netting Arrangement	7	3
Forward Contract Derivative Asset, at Fair Value	2	2
Currency Swap
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	93	83
Interest Rate Contract
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	1,368	1,639
Letter of Credit
Offsetting Liabilities [Line Items]
Amount of letters of credit outstanding	1,017	1,200
Fair Value, Inputs, Level 2
Offsetting Liabilities [Line Items]
Forward Contract Derivative Asset, at Fair Value	$ 2	$ 2

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