DEBT - Schedule of Debt (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Debt Issuance Costs	$ (136.0)	$ (106.0)
Original Issue (Discount) Premium	(51.0)	(56.0)
Short-term borrowings—trade receivable securitization facility	486.0	349.0
Gross Amount	24,581.0	19,563.0
Net Amount	24,394.0	19,401.0
Finance lease obligations	262.0	193.0
Current portion of long-term debt	98.0	71.0
Long-term Debt, Gross and Lease Obligation	24,482.0	19,492.0
Deferred Finance Costs, Excluding Current Maturities	(135.0)	(106.0)
Debt Instrument, Unamortized Discount, Excluding Current Maturities	(51.0)	(56.0)
LONG-TERM DEBT	24,296.0	19,330.0
Term loans
Debt Instrument [Line Items]
Debt Issuance Costs	(25.0)	(22.0)
Original Issue (Discount) Premium	(35.0)	(48.0)
Gross Amount	8,702.0	6,249.0
Net Amount	$ 8,642.0	6,179.0
Secured Debt \| Senior Secured Notes $4,400M due 2026 6.25%
Debt Instrument [Line Items]
Interest rate	6.25%
Debt Issuance Costs		(25.0)
Original Issue (Discount) Premium		2.0
Gross Amount		4,400.0
Net Amount		4,377.0
Secured Debt \| Senior Secured Notes $2,100M due 2028 6.75%
Debt Instrument [Line Items]
Debt Issuance Costs	$ (15.0)
Original Issue (Discount) Premium	(8.0)
Gross Amount	2,100.0
Net Amount	2,077.0	2,071.0
Secured Debt \| Senior Secured Notes $1,450M due 2030 6.875%
Debt Instrument [Line Items]
Debt Issuance Costs	(12.0)
Original Issue (Discount) Premium	0.0
Gross Amount	1,450.0
Net Amount	$ 1,438.0	1,436.0
Secured Debt \| Senior Secured Notes $2,750M due 2029 6.375%
Debt Instrument [Line Items]
Interest rate	6.375%
Debt Issuance Costs	$ (22.0)
Original Issue (Discount) Premium	(1.0)
Gross Amount	2,750.0
Net Amount	$ 2,727.0	0.0
Secured Debt \| Senior Secured Notes $1,000M due 2031 7.125%
Debt Instrument [Line Items]
Interest rate	7.125%
Debt Issuance Costs	$ (9.0)
Original Issue (Discount) Premium	(7.0)
Gross Amount	1,000.0
Net Amount	$ 984.0	0.0
Secured Debt \| Senior Secured Notes $2,200M due 2032 6.625%
Debt Instrument [Line Items]
Interest rate	6.625%
Debt Issuance Costs	$ (20.0)
Original Issue (Discount) Premium	0.0
Gross Amount	2,200.0
Net Amount	$ 2,180.0	0.0
Secured Debt \| Senior Secured Notes $1,500M due 2033 6.00%
Debt Instrument [Line Items]
Interest rate	6.00%
Debt Issuance Costs	$ (14.0)
Original Issue (Discount) Premium	0.0
Gross Amount	1,500.0
Net Amount	1,486.0	0.0
Secured Debt \| Senior Secured Notes $2,100M due 2028
Debt Instrument [Line Items]
Debt Issuance Costs		(19.0)
Original Issue (Discount) Premium		(10.0)
Gross Amount		2,100.0
Net Amount		2,071.0
Secured Debt \| Senior Secured Notes $1,450M due 2030
Debt Instrument [Line Items]
Debt Issuance Costs		(14.0)
Original Issue (Discount) Premium		0.0
Gross Amount		1,450.0
Net Amount		$ 1,436.0
Senior Subordinated Notes \| Senior Subordinated Notes $550M due 2027 7.50%
Debt Instrument [Line Items]
Interest rate		7.50%
Debt Issuance Costs		$ (2.0)
Original Issue (Discount) Premium		0.0
Gross Amount		550.0
Net Amount	$ 0.0	548.0
Senior Subordinated Notes \| Senior Subordinated Notes $2,650M due 2027 5.50%
Debt Instrument [Line Items]
Interest rate	5.50%
Debt Issuance Costs	$ (9.0)	(12.0)
Original Issue (Discount) Premium	0.0	0.0
Gross Amount	2,650.0	2,650.0
Net Amount	$ 2,641.0	2,638.0
Senior Subordinated Notes \| Senior Subordinated Notes $1,200M due 2029 4.625%
Debt Instrument [Line Items]
Interest rate	4.625%
Debt Issuance Costs	$ (6.0)	(7.0)
Original Issue (Discount) Premium	0.0	0.0
Gross Amount	1,200.0	1,200.0
Net Amount	$ 1,194.0	1,193.0
Senior Subordinated Notes \| Senior Subordinated Notes $750M due 2029 4.875%
Debt Instrument [Line Items]
Interest rate	4.875%
Debt Issuance Costs	$ (4.0)	(5.0)
Original Issue (Discount) Premium	0.0	0.0
Gross Amount	750.0	750.0
Net Amount	$ 746.0	745.0
Senior Subordinated Notes \| Senior Subordinated Notes $2,100M due 2028 6.75%
Debt Instrument [Line Items]
Interest rate	6.75%
Senior Subordinated Notes \| Senior Subordinated Notes $1,450M due 2030 6.875%
Debt Instrument [Line Items]
Interest rate	6.875%
Government Refundable Advances
Debt Instrument [Line Items]
Debt Issuance Costs	$ 0.0	0.0
Original Issue (Discount) Premium	0.0	0.0
Net Amount	17.0	21.0
Government refundable advances	17.0	21.0
Finance Lease Obligations
Debt Instrument [Line Items]
Debt Issuance Costs	0.0
Original Issue (Discount) Premium	0.0
Finance lease obligations	262.0
Long-term Debt, Current Maturities
Debt Instrument [Line Items]
Debt Issuance Costs	(1.0)	0.0
Original Issue (Discount) Premium	0.0	0.0
Less: current portion	99.0	71.0
Current portion of long-term debt	98.0	71.0
Finance Lease Obligations
Debt Instrument [Line Items]
Debt Issuance Costs		0.0
Original Issue (Discount) Premium		0.0
Finance lease obligations	262.0	193.0
Asset-backed Securities
Debt Instrument [Line Items]
Short-term borrowings—trade receivable securitization facility, Gross	487.0	350.0
Debt Issuance Costs	(1.0)	(1.0)
Original Issue (Discount) Premium	0.0	0.0
Short-term borrowings—trade receivable securitization facility	$ 486.0	$ 349.0

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