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Summary of Significant Accounting Policies Allowance for Uncollectible Accounts (Details) - USD ($) $ in Millions	Dec. 31, 2020	Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, after Allowance for Credit Loss	$ 96	$ 93
Allowance for uncollectible accounts	1
Loans and Leases Receivable, Allowance	5	1
Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, after Allowance for Credit Loss	$ 109	$ 105

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Amount of allowance for credit loss on accounts receivable, classified as current.

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