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Debt - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Apr. 01, 2022
Mar. 31, 2022
Feb. 28, 2022
Debt Instrument [Line Items]                
Short-term debt, weighted average interest rate   1.15% 1.00% 1.15%        
Aggregate annual maturities of long-term debt, 2022     $ 439          
Aggregate annual maturities of long-term debt, 2023     1,574          
Aggregate annual maturities of long-term debt, 2024     2,019          
Aggregate annual maturities of long-term debt, 2025     951          
Aggregate annual maturities of long-term debt, 2026     2,801          
Letters Of Credit Issuable Under Credit Facility     100          
Swingline Loans Issuable Under Credit Facility     100          
Line Of Credit Facility Maximum Additional Principal Amount Commitments     500          
Line of Credit Facility, Maximum Borrowing Capacity     3,250          
Long-Term Debt   $ 17,110 13,886 $ 17,110        
Losses on debt extinguishment     24 178 $ 8      
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff                
Debt Instrument [Line Items]                
Disposal Group, Including Discontinued Operation, Consideration             $ 1,266  
Commercial Paper                
Debt Instrument [Line Items]                
Short-term Debt   $ 0 230 0        
Notes 5.000% due February 15, 2030                
Debt Instrument [Line Items]                
Debt instrument, face amount               $ 500
Interest rate               5.00%
Notes 6.750% due February 15, 2030                
Debt Instrument [Line Items]                
Debt instrument, face amount           $ 200 200  
Interest rate           6.75%    
Floating Rate Notes Due June 6, 2022                
Debt Instrument [Line Items]                
Debt Instrument, Repurchased Face Amount           $ 199    
Losses on debt extinguishment $ 2              
Floating Rate Notes Due June 6, 2022 | Long-term Debt                
Debt Instrument [Line Items]                
Long-Term Debt           $ 199    
Revolving Credit Facility due December 29, 2022                
Debt Instrument [Line Items]                
Debt Instrument, Term   5 years            
Borrowings under credit facility   $ 0 0 $ 0        
Revolving Credit Facility due December 29, 2022 | Maximum                
Debt Instrument [Line Items]                
Line of Credit Facility, Current Borrowing Capacity     $ 2,750       500  
Term Loan Facility                
Debt Instrument [Line Items]                
Debt instrument, face amount             $ 950