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Debt and Other Obligations Debt and Other Obligations - Maturities Due (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2029	Sep. 30, 2028	Sep. 30, 2027	Sep. 30, 2026	Sep. 30, 2025
Debt Instrument
2018	$ 1,022
2019	1,022
2020	1,370
2021	1,020
2022	1,272
Thereafter	13,395
Total	19,101
Short-Term Debt	432	$ 1,172
Net discount on sale of Bonds	85
Foreign Currency Transaction Gain (Loss), Unrealized	109	150
Short-term Borrowings Gross	432	$ 1,173
Short-Term Debt
Debt Instrument
Debt issuance costs	1
Scenario, Forecast
Debt Instrument
Short-Term Debt			$ 0	$ 0	$ 0	$ 0	$ 0
Power bonds
Debt Instrument
Debt issuance costs	$ 41

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-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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