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Risk Management Activities and Derivative Transactions Offsetting for Derivative Liabilities (Details) $ in Millions	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Mar. 31, 2021 Bond_issues
Offsetting Liabilities [Line Items]
Number of currency swaps outstanding | Bond_issues			2
Accounts Receivable, before Allowance for Credit Loss, Current	$ 1,310	$ 1,480
Total derivatives not subject to master netting or similar arrangement	111	250
Gross amounts of recognized liabilities	1,700	1,722
Derivative Liability, Not Subject to Master Netting Arrangement	6	3
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	1,706	1,725
Forward Contract Derivative Asset, at Fair Value	(2)	2
Currency Swap
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	78	83
Interest Rate Contract
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	1,622	1,639
Letter of Credit
Offsetting Liabilities [Line Items]
Amount of letters of credit outstanding	1,114	1,200
Fair Value, Inputs, Level 2
Offsetting Liabilities [Line Items]
Forward Contract Derivative Asset, at Fair Value	$ (2)	$ 2

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