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Summary of Significant Accounting Policies Allowance for Uncollectible Accounts (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Sep. 30, 2021
Portion at Other than Fair Value Measurement [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, after Allowance for Credit Loss $ 128 $ 99
Allowance for uncollectible accounts 1 1
Financing Receivable, after Allowance for Credit Loss 120 94
Loans and Leases Receivable, Allowance $ 4 $ 4