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Summary of Significant Accounting Policies Allowance for Uncollectible Accounts (Details) - USD ($) $ in Millions	Mar. 31, 2023	Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for uncollectible accounts	$ 1	$ 1
Financing Receivable, after Allowance for Credit Loss	110	96
Loans and Leases Receivable, Allowance	3	3
Reported Value Measurement
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, after Allowance for Credit Loss	$ 119	$ 105

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

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amortized cost, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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