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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Allowance for Uncollectible Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Allowance for Uncollectible Accounts
Revenue Capitalized During Pre-Commercial Operations	$ 0	$ 11	$ (22)
Period of time for customers to fulfill payment arrangements	90 days
Allowance for uncollectible accounts - receivables		1
Loans receivable	$ 120	123
Allowance for uncollectible accounts - loans		1
Fuel Cost Capitalized During Pre-Commercial Operations		$ 19

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Estimates of revenue realized from pre-commercial generation based on the guidance provided by FERC regulations. The calculated revenue is capitalized to offset project costs and is included in revenue as a contra-revenue amount

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