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Summary of Significant Accounting Policies - Allowance for Uncollectible Accounts (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020
Portion at Other than Fair Value Measurement [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, after Allowance for Credit Loss	$ 99	$ 105
Financing Receivable, after Allowance for Credit Loss	94	93
Allowance for uncollectible accounts - receivables	1	1
Allowance for uncollectible accounts - loans	$ 4	$ 1

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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Amount of allowance for credit loss on financing receivable, classified as noncurrent.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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