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Risk Management Activities and Derivative Transactions Offsetting for Derivative Liabilities (Details) $ in Millions	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Mar. 31, 2023 Bond_issues
Offsetting Liabilities [Line Items]
Number of currency swaps outstanding | Bond_issues			2
Accounts Receivable, before Allowance for Credit Loss, Current	$ 1,451	$ 1,627
Amount of letters of credit outstanding	6
Forward Contract Derivative Asset, at Fair Value	3	11
Letter of Credit
Offsetting Liabilities [Line Items]
Amount of letters of credit outstanding	469	535
Interest Swap Collateral
Offsetting Liabilities [Line Items]
Amount of letters of credit outstanding	443
Fair Value, Inputs, Level 2
Offsetting Liabilities [Line Items]
Forward Contract Derivative Asset, at Fair Value	$ 3	$ 11

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