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Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets $ 34 $ 56
Total liabilities 3,319 3,280
Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 354 332
Total liabilities 113 151
Quoted Prices in Active Markets (Level 1) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 320 276
Total liabilities 0 0
Significant Other Observable Inputs (Level 2) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 34 56
Total liabilities 17 27
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets 0 0
Total liabilities 96 124
Other current assets | Foreign currency exchange derivatives | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 25 29
Other current assets | Foreign currency exchange derivatives | Quoted Prices in Active Markets (Level 1) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Other current assets | Foreign currency exchange derivatives | Significant Other Observable Inputs (Level 2) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 25 29
Other current assets | Foreign currency exchange derivatives | Significant Unobservable Inputs (Level 3) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Other current assets | Commodity derivatives | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 2  
Other current assets | Commodity derivatives | Quoted Prices in Active Markets (Level 1) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0  
Other current assets | Commodity derivatives | Significant Other Observable Inputs (Level 2) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 2  
Other current assets | Commodity derivatives | Significant Unobservable Inputs (Level 3) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0  
Other current assets | Interest rate swaps | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets   22
Other current assets | Interest rate swaps | Quoted Prices in Active Markets (Level 1) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets   0
Other current assets | Interest rate swaps | Significant Other Observable Inputs (Level 2) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets   22
Other current assets | Interest rate swaps | Significant Unobservable Inputs (Level 3) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets   0
Other noncurrent assets | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation plan assets 53 45
Other noncurrent assets | Quoted Prices in Active Markets (Level 1) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation plan assets 53 45
Other noncurrent assets | Significant Other Observable Inputs (Level 2) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation plan assets 0 0
Other noncurrent assets | Significant Unobservable Inputs (Level 3) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation plan assets 0 0
Other noncurrent assets | Fixed Income Securities | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in marketable common stock 81 76
Other noncurrent assets | Fixed Income Securities | Quoted Prices in Active Markets (Level 1) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in marketable common stock 81 76
Other noncurrent assets | Fixed Income Securities | Significant Other Observable Inputs (Level 2) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in marketable common stock 0 0
Other noncurrent assets | Fixed Income Securities | Significant Unobservable Inputs (Level 3) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in marketable common stock 0 0
Other noncurrent assets | Equity Securities | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in marketable common stock 186 155
Other noncurrent assets | Equity Securities | Quoted Prices in Active Markets (Level 1) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in marketable common stock 186 155
Other noncurrent assets | Equity Securities | Significant Other Observable Inputs (Level 2) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in marketable common stock 0 0
Other noncurrent assets | Equity Securities | Significant Unobservable Inputs (Level 3) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in marketable common stock 0 0
Other noncurrent assets | Cross-currency interest rate swap | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 7 5
Other noncurrent assets | Cross-currency interest rate swap | Quoted Prices in Active Markets (Level 1) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Other noncurrent assets | Cross-currency interest rate swap | Significant Other Observable Inputs (Level 2) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 7 5
Other noncurrent assets | Cross-currency interest rate swap | Significant Unobservable Inputs (Level 3) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Other current liabilities | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent earn-out liabilities 63 48
Other current liabilities | Quoted Prices in Active Markets (Level 1) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent earn-out liabilities 0 0
Other current liabilities | Significant Other Observable Inputs (Level 2) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent earn-out liabilities 0 0
Other current liabilities | Significant Unobservable Inputs (Level 3) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent earn-out liabilities 63 48
Other current liabilities | Foreign currency exchange derivatives | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities 17 25
Other current liabilities | Foreign currency exchange derivatives | Quoted Prices in Active Markets (Level 1) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities 0 0
Other current liabilities | Foreign currency exchange derivatives | Significant Other Observable Inputs (Level 2) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities 17 25
Other current liabilities | Foreign currency exchange derivatives | Significant Unobservable Inputs (Level 3) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities 0 0
Other current liabilities | Commodity derivatives | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities   2
Other current liabilities | Commodity derivatives | Quoted Prices in Active Markets (Level 1) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities   0
Other current liabilities | Commodity derivatives | Significant Other Observable Inputs (Level 2) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities   2
Other current liabilities | Commodity derivatives | Significant Unobservable Inputs (Level 3) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities   0
Other noncurrent liabilities | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent earn-out liabilities 33 76
Other noncurrent liabilities | Quoted Prices in Active Markets (Level 1) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent earn-out liabilities 0 0
Other noncurrent liabilities | Significant Other Observable Inputs (Level 2) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent earn-out liabilities 0 0
Other noncurrent liabilities | Significant Unobservable Inputs (Level 3) | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent earn-out liabilities $ 33 $ 76