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Summary of Significant Accounting Policies Allowance for Uncollectible Accounts (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Defined Benefit Plan, Other Cost (Credit)	$ 63	$ 65	$ 190	$ 194
Financing Receivable, after Allowance for Credit Loss	122		122		$ 120
Other Deferred Costs, Net	10		10
Carrying Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, after Allowance for Credit Loss	$ 134		$ 134		$ 131

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Amount of defined benefit plan cost (credit), classified as other.

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Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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-Publisher FASB
-Name Accounting Standards Codification
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Net amount of other deferred costs capitalized at the end of the reporting period. Does not include deferred finance costs or deferred acquisition costs of insurance companies.

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-Topic 210
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