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FAIR VALUE MEASUREMENTS Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents, Assets, Carrying Amount $ 2,808 $ 6,261
Short-term borrowings - trade receivable securitization facility, Carrying Amount 724 486
Net Amount 29,291 24,394
Prepaid Expenses and Other    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest Rate Cap Assets 0 20
Interest Rate Collar Assets 4 0
Foreign Currency Contract, Asset 0 3
Interest Rate Swap Asset Carrying Amount 3 34
Other Noncurrent Assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest Rate Collar Assets 3 3
Interest Rate Swap Asset Carrying Amount 5 0
Accrued Liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest Rate Cap Liabilities 0 1
Interest rate swap agreements, Liabilities, Carrying Amount 0 1
Foreign Currency Contract, Liability 2 0
Other Non-Current Liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest Rate Collar Liability 3 8
Term loans    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Net Amount 11,048 8,642
Government Refundable Advances    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Net Amount 12 17
Finance lease obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Net Amount 284 262
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents, Assets, Fair Value 2,808 6,261
Fair Value, Inputs, Level 2 [Member] | Prepaid Expenses and Other    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest Rate Cap Assets 0 20
Interest Rate Collar Assets 4 0
Foreign Currency Contract, Asset 0 3
Interest Rate Swap Asset at Fair Value 3 34
Fair Value, Inputs, Level 2 [Member] | Other Noncurrent Assets    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest Rate Collar Assets 3 3
Interest Rate Swap Asset at Fair Value 5 0
Fair Value, Inputs, Level 2 [Member] | Accrued Liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest Rate Cap Liabilities 0 1
Interest Rate Cash Flow Hedge Liability at Fair Value 0 1
Foreign Currency Contract, Liability 2 0
Fair Value, Inputs, Level 2 [Member] | Other Non-Current Liabilities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest Rate Collar Liability 3 8
Fair Value, Inputs, Level 2 [Member] | Term loans    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Fair Value 11,120 8,694
Fair Value, Inputs, Level 2 [Member] | Government Refundable Advances    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Fair Value 12 17
Fair Value, Inputs, Level 2 [Member] | Finance lease obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Fair Value 284 262
6.750% secured notes due 2028 (“2028 Secured Notes”) | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Net Amount 2,083 2,077
6.750% secured notes due 2028 (“2028 Secured Notes”) | Fair Value, Inputs, Level 1 [Member] | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Fair Value 2,139 2,160
5.500% senior subordinated notes due 2027 (“5.500% 2027 Notes”) | Senior Subordinated Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Net Amount 0 2,641
5.500% senior subordinated notes due 2027 (“5.500% 2027 Notes”) | 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 2,637
4.625% senior subordinated notes due 2029 (“4.625% 2029 Notes”) | Senior Subordinated Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Net Amount 1,195 1,194
4.625% senior subordinated notes due 2029 (“4.625% 2029 Notes”) | Fair Value, Inputs, Level 1 [Member] | Senior Subordinated Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Fair Value 1,175 1,160
4.875% senior subordinated notes due 2029 (“4.875% 2029 Notes”) | Senior Subordinated Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Net Amount 747 746
4.875% senior subordinated notes due 2029 (“4.875% 2029 Notes”) | Fair Value, Inputs, Level 1 [Member] | Senior Subordinated Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Fair Value 739 729
6.875% secured notes due 2030 (“2030 Secured Notes”) | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Net Amount 1,440 1,438
6.875% secured notes due 2030 (“2030 Secured Notes”) | Fair Value, Inputs, Level 1 [Member] | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Fair Value 1,501 1,519
6.375% secured notes due 2029 (“2029 Secured Notes”) | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Net Amount 2,732 2,727
6.375% secured notes due 2029 (“2029 Secured Notes”) | Fair Value, Inputs, Level 1 [Member] | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Fair Value 2,812 2,836
7.125% secured notes due 2031 (“2031 Secured Notes”) | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Net Amount 986 984
7.125% secured notes due 2031 (“2031 Secured Notes”) | Fair Value, Inputs, Level 1 [Member] | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Fair Value 1,041 1,058
6.625% secured notes due 2032 (“2032 Secured Notes”) | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Net Amount 2,183 2,180
6.625% secured notes due 2032 (“2032 Secured Notes”) | Fair Value, Inputs, Level 1 [Member] | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Fair Value 2,263 2,291
6.000% secured notes due 2033 (“2033 Secured Notes”) | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Net Amount 1,488 1,486
6.000% secured notes due 2033 (“2033 Secured Notes”) | Fair Value, Inputs, Level 1 [Member] | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Fair Value 1,517 1,521
6.375% senior subordinated notes due 2033 (“6.375% 2033 Notes”) | Senior Subordinated Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Net Amount 2,616  
6.375% senior subordinated notes due 2033 (“6.375% 2033 Notes”) | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Net Amount 2,616 0
6.375% senior subordinated notes due 2033 (“6.375% 2033 Notes”) | Fair Value, Inputs, Level 1 [Member] | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Fair Value 2,686 0
6.250% secured notes due 2034 (“2034 Secured Notes”) | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Net Amount 495 0
6.250% secured notes due 2034 (“2034 Secured Notes”) | Fair Value, Inputs, Level 1 [Member] | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Fair Value 514 0
6.750% senior subordinated notes due 2034 (“6.750% 2034 Notes”) | Senior Subordinated Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Net Amount 1,982  
6.750% senior subordinated notes due 2034 (“6.750% 2034 Notes”) | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Net Amount 1,982 0
6.750% senior subordinated notes due 2034 (“6.750% 2034 Notes”) | Fair Value, Inputs, Level 1 [Member] | Secured Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, Fair Value 2,068 0
Asset-backed Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term borrowings - trade receivable securitization facility, Carrying Amount 724 486
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 $ 724 $ 486