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Risk Management Activities and Derivative Transactions Offsetting for Derivative Liabilities (Details) $ in Millions	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2020 Bond_issues
Offsetting Liabilities [Line Items]
Number of currency swaps outstanding | Bond_issues			3
Accounts Receivable, before Allowance for Credit Loss, Current	$ 1,242	$ 1,401
Total derivatives not subject to master netting or similar arrangement	25	49
Gross amounts of recognized liabilities	1,977	2,250
Derivative Liability, Not Subject to Master Netting Arrangement	3	3
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	1,980	2,253
Forward Contract Derivative Asset, at Fair Value	11	13
Currency Swap
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	108	209
Interest Rate Contract
Offsetting Liabilities [Line Items]
Gross amounts of recognized liabilities	1,869	2,041
Letter of Credit
Offsetting Liabilities [Line Items]
Amount of letters of credit outstanding	1,364	1,500
Fair Value, Inputs, Level 2
Offsetting Liabilities [Line Items]
Forward Contract Derivative Asset, at Fair Value	$ 11	$ 13

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