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FAIR VALUE MEASUREMENTS Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Assets, Carrying Amount	$ 6,261	$ 3,472
Short-term borrowings - trade receivable securitization facility, Carrying Amount	486	349
Net Amount	24,394	19,401
Prepaid Expenses and Other Current Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Cap Assets	20	0
Foreign Currency Contract, Asset	3	0
Interest Rate Swap Asset Carrying Amount	34	103
Other Noncurrent Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Cap Assets	0	53
Interest Rate Swap Asset Carrying Amount	0	41
Interest Rate Collar Assets	3	17
Accrued Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap agreements, Liabilities, Carrying Amount	1	0
Foreign Currency Contract, Liability	0	5
Interest Rate Cap Liabilities	1	0
Other Non-Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap agreements, Liabilities, Carrying Amount	0	3
Interest Rate Cap Liabilities	0	1
Interest Rate Collar Liability	8	0
Term loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	8,642	6,179
Government Refundable Advances
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	17	21
Finance Lease Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	262	193
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Assets, Fair Value	6,261	3,472
Fair Value, Inputs, Level 2 [Member] | Prepaid Expenses and Other Current Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Cap Assets	20	0
Foreign Currency Contract, Asset	3	0
Interest Rate Swap Asset at Fair Value	34	103
Fair Value, Inputs, Level 2 [Member] | Other Noncurrent Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Cap Assets	0	53
Interest Rate Swap Asset at Fair Value	0	41
Interest Rate Collar Assets	3	17
Fair Value, Inputs, Level 2 [Member] | Accrued Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Cash Flow Hedge Liability at Fair Value	1	0
Foreign Currency Contract, Liability	0	5
Interest Rate Cap Liabilities	1	0
Fair Value, Inputs, Level 2 [Member] | Other Non-Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Cash Flow Hedge Liability at Fair Value	0	3
Interest Rate Cap Liabilities	0	1
Interest Rate Collar Liability	8	0
Fair Value, Inputs, Level 2 [Member] | Term loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	8,694	6,212
Fair Value, Inputs, Level 2 [Member] | Government Refundable Advances
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	17	21
Fair Value, Inputs, Level 2 [Member] | Finance Lease Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	262	193
Senior Secured Notes $4.4B Due 2026 6.25% | Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	0	4,377
Senior Secured Notes $4.4B Due 2026 6.25% | Fair Value, Inputs, Level 1 [Member] | Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	0	4,329
Senior Secured Notes $2,100M due 2028 6.75% | Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	2,077	2,071
Senior Secured Notes $2,100M due 2028 6.75% | Fair Value, Inputs, Level 1 [Member] | Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	2,160	2,069
Senior Subordinated Notes $550M due 2027 7.50% | Senior Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	0	548
Senior Subordinated Notes $550M due 2027 7.50% | Fair Value, Inputs, Level 1 [Member] | Senior Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	0	549
Senior Subordinated Notes $2,650M due 2027 5.50% | Senior Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	2,641	2,638
Senior Subordinated Notes $2,650M due 2027 5.50% | Fair Value, Inputs, Level 1 [Member] | Senior Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	2,637	2,484
Senior Subordinated Notes $1,200M due 2029 4.625% | Senior Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	1,194	1,193
Senior Subordinated Notes $1,200M due 2029 4.625% | Fair Value, Inputs, Level 1 [Member] | Senior Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	1,160	1,047
Senior Subordinated Notes $750M due 2029 4.875% | Senior Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	746	745
Senior Subordinated Notes $750M due 2029 4.875% | Fair Value, Inputs, Level 1 [Member] | Senior Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	729	654
Senior Secured Notes $1,450M due 2030 6.875% | Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	1,438	1,436
Senior Secured Notes $1,450M due 2030 6.875% | Fair Value, Inputs, Level 1 [Member] | Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	1,519	1,423
Senior Secured Notes $2,750M due 2029 6.375% | Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	2,727	0
Senior Secured Notes $2,750M due 2029 6.375% | Fair Value, Inputs, Level 1 [Member] | Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	2,836	0
Senior Secured Notes $1,000M due 2031 7.125% | Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	984	0
Senior Secured Notes $1,000M due 2031 7.125% | Fair Value, Inputs, Level 1 [Member] | Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	1,058	0
Senior Secured Notes $2,200M due 2032 6.625% | Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	2,180	0
Senior Secured Notes $2,200M due 2032 6.625% | Fair Value, Inputs, Level 1 [Member] | Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	2,291	0
Senior Secured Notes $1,500M due 2033 6.00% | Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	1,486	0
Senior Secured Notes $1,500M due 2033 6.00% | Fair Value, Inputs, Level 1 [Member] | Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	1,521	0
Asset-backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings - trade receivable securitization facility, Carrying Amount	486	349
Asset-backed Securities | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings - trade receivable securitization facility, Fair Value	$ 486	$ 349

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