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Debt and Other Obligations Debt and Other Obligations - Maturities Due (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2016
Debt Instrument
2018		$ 1,116
2019		1,092
2020		1,901
2021		1,072
2022		69
Thereafter		17,474
Total		22,724
Short-term debt, net of discounts	$ 1,998	1,216	$ 1,407
Short-term debt, net of discounts total		1,216
Foreign Currency Transaction Gain (Loss), before Tax	$ 125	147
Net discount on sale of Bonds		88
Power bonds
Debt Instrument
Debt issuance costs		56
Other long-term debt
Debt Instrument
Debt issuance costs		$ 10

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Amount of outstanding short-term debt or borrowing associated with any securities or credit agreement for which there has been a default in principal, interest, sinking fund, or redemption provisions, or any breach of covenant that existed at the end of the period and subsequently has not been cured.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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