Variable Interest Entities (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Oct. 02, 2024	Sep. 30, 2013	Sep. 30, 2012
Liabilities
Current maturities of long-term debt of variable interest entities issued at par	$ 49	$ 37
Liabilities, Current	5,607	5,873
Other long-term liabilities	1,606	1,712
Long-term debt of variable interest entities, net	1,632	897
VIE Financing
Face Amount	$ 40				$ 360
Rate of Return SHLLC	7.00%
Accrued interest	$ 29	9
Minimum payments on membership interests subject to mandatory redemption, due in next twelve months	1
Minimum payments on membership interests subject to mandatory redemption, due in year two	1
Minimum payments on membership interests subject to mandatory redemption, due in year three	1
Minimum payments on membership interests subject to mandatory redemption, due in year four	2
Minimum payments on membership interests subject to mandatory redemption, due in year five	2
Minimum payments on membership interests subject to mandatory redemption, due thereafter	9
2018	1,370
2019	1,020
2020	1,272
2021	220
2022	2,262
Thereafter	15,913
Long-term debt of variable interest entities (including current maturities)	1,696	966
Amount of letters of credit outstanding	6
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	167	128
Variable Interest Entity, Primary Beneficiary [Member]
VIE Financing
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	17
Letter of Credit
VIE Financing
Amount of letters of credit outstanding	498	566
SCCG
VIE Financing
Debt and Lease Obligation					$ 400
Holdco
VIE Financing
Face Amount						$ 100
JSCCG
VIE Financing
Face Amount						900
Variable Interest Entity, Primary Beneficiary [Member]
Liabilities
Liabilities, Current	79	47
Other long-term liabilities	14	16
VIE Financing
Debt and Lease Obligation		0		$ 800
Accounts Payable and Accrued Liabilities	1	1
Liabilities	1,725	960				$ 1,000
Interest Expense	86	$ 46	$ 48
2018	49
2019	51
2020	53
2021	56
2022	58
Thereafter	$ 1,431
JHLLC
VIE Financing
Face Amount				$ 80