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Variable Interest Entities Variable Interest Entities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Oct. 02, 2024	Sep. 30, 2024	Sep. 30, 2013	Sep. 30, 2012
Variable Interest Entities
Other long-term liabilities	$ 1,551		$ 1,551			$ 1,712
Accrued interest	29		29			9
VIE Financing
Face amount	$ 40		$ 40				$ 360
Financial instruments subject to mandatory redemption, interest rate, stated percentage	7.00%		7.00%
Liabilities
Current maturities of long-term debt of variable interest entities	$ 47		$ 47			37
Long-term debt of variable interest entities, net	1,656		1,656			897
Liabilities, Current	6,615		6,615			5,873
Restricted cash						0
Assets, Total	59,305		59,305			57,703
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entities
Other long-term liabilities	15		15			16
Liabilities	1,748		1,748			960		$ 1,000
VIE Financing
Debt and Lease Obligation					$ 800
Liabilities
Liabilities, Current	77		77			47
Interest Expense	21	$ 12	43	$ 23
Accounts Payable and Accrued Liabilities	1		1			1
Assets, Total	25		25			0
Cash					775
JSCCG
VIE Financing
Face amount								900
Holdco
VIE Financing
Face amount								$ 100
SCCG
VIE Financing
Debt and Lease Obligation							$ 400
JACTG
VIE Financing
Face amount					720
Liabilities
Restricted cash	$ 25		$ 25			$ 0
JHLLC
VIE Financing
Face amount					$ 80

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