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Debt and Other Obligations Debt and Other Obligations - Debt Securities Activity (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2013	Jan. 17, 2012
Debt Instrument
Issues of power bonds	$ 484	$ 500	$ 997
Face Amount	40			$ 360
Discount on debt issues	(16)	0
Redemptions/Maturities of variable interest entities	43	41	39
Redemptions/Maturities of power bonds	$ 1,028	$ 1,860	$ 1,427
Percent of par value	96.786%	99.982%
Total Current maturities of power bonds issued at par	$ 29	$ 1,028
Interest rate					7.10%
Short-term debt, net of discounts	1,172	780
Current maturities of long-term debt of variable interest entities issued at par	39	43
Long-term power bonds, net	17,826	17,457
880591EF5 (12.15.20)
Debt Instrument
Total Current maturities of power bonds issued at par	$ 1	1
Interest rate	3.77%
Debt Instrument, Maturity Date	Dec. 15, 2022
880591EF5 (6.15.21)
Debt Instrument
Total Current maturities of power bonds issued at par	$ 28	27
Interest rate	3.77%
Debt Instrument, Maturity Date	Jun. 15, 2023
880591EN8
Debt Instrument
Total Current maturities of power bonds issued at par	$ 0	$ 1,000
Interest rate	1.875%
Debt Instrument, Maturity Date	Aug. 15, 2022
Total
Debt Instrument
Debt Instrument, Redemption Period, End Date	1,071	1,901
Percent of par value	100.00%
Debt of variable interest entities
Debt Instrument
Redemptions/Maturities of variable interest entities	$ 43	$ 41
2009 Series B
Debt Instrument
Redemptions/Maturities of power bonds	28	29
2011 Series A
Debt Instrument
Redemptions/Maturities of power bonds	0	1,500
1998 Series H
Debt Instrument
Redemptions/Maturities of power bonds	0	331
2012 Series A
Debt Instrument
Redemptions/Maturities of power bonds	1,000	0
Total
Debt Instrument
Debt Securities Issues	484	500
2021 Series A
Debt Instrument
Debt Securities Issues	$ 0
880591EY4
Debt Instrument
Interest rate	4.25%
Debt Instrument, Maturity Date	Sep. 15, 2052
Long-term power bonds, net	$ 500	0
880591EX6
Debt Instrument
Interest rate	1.50%
Debt Instrument, Maturity Date	Sep. 15, 2031
Long-term power bonds, net	$ 500	$ 500

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