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

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