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

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