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Fair Value Measurements - Summary of Financial Instruments Subject to Recurring Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Mar. 31, 2022
Sep. 30, 2021
Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Assets    
Cash and cash equivalents $ 964 $ 210
Restricted investments 423 [1],[2] 421 [3],[4]
Investment of captive insurance company 9 [5] 8 [6]
Foreign currency derivatives 3 [7] 1 [8]
Total assets at fair value 1,405 645
Liabilities    
Foreign currency derivatives 2 [9] 2 [10]
Total liabilities at fair value 2  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Total Return Derivatives [Member]    
Assets    
Derivative assets [7] 1  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commodity Derivatives [Member]    
Assets    
Derivative assets 5 [7] 5 [8]
Estimate of Fair Value, Fair Value Disclosure [Member]    
Assets    
Cash and cash equivalents 964 210
Restricted investments 423 [1],[2] 421 [3],[4]
Investment of captive insurance company 9 [5] 8 [6]
Foreign currency derivatives 3 [7] 1 [8]
Total assets at fair value 1,405 645
Liabilities    
Foreign currency derivatives 2 [9] 2 [10]
Total liabilities at fair value 2  
Estimate of Fair Value, Fair Value Disclosure [Member] | Total Return Derivatives [Member]    
Assets    
Derivative assets [7] 1  
Estimate of Fair Value, Fair Value Disclosure [Member] | Commodity Derivatives [Member]    
Assets    
Derivative assets 5 [7] 5 [8]
Fair Value, Inputs, Level 1 [Member]    
Assets    
Cash and cash equivalents 964 210
Restricted investments 423 [1],[2] 421 [3],[4]
Investment of captive insurance company 9 [5] 8 [6]
Foreign currency derivatives 0 [7] 0 [8]
Total assets at fair value 1,396 639
Liabilities    
Foreign currency derivatives 0 [9] 0 [10]
Total liabilities at fair value 0  
Fair Value, Inputs, Level 1 [Member] | Total Return Derivatives [Member]    
Assets    
Derivative assets [7] 0  
Fair Value, Inputs, Level 1 [Member] | Commodity Derivatives [Member]    
Assets    
Derivative assets 0 [7] 0 [8]
Fair Value, Inputs, Level 2 [Member]    
Assets    
Cash and cash equivalents 0 0
Restricted investments 0 [1],[2] 0 [3],[4]
Investment of captive insurance company 0 [5] 0 [6]
Foreign currency derivatives 3 [7] 1 [8]
Total assets at fair value 9 6
Liabilities    
Foreign currency derivatives 2 [9] 2 [10]
Total liabilities at fair value 2  
Fair Value, Inputs, Level 2 [Member] | Total Return Derivatives [Member]    
Assets    
Derivative assets [7] 1  
Fair Value, Inputs, Level 2 [Member] | Commodity Derivatives [Member]    
Assets    
Derivative assets 5 [7] 5 [8]
Fair Value, Inputs, Level 3 [Member]    
Assets    
Cash and cash equivalents 0 0
Restricted investments 0 [1],[2] 0 [3],[4]
Investment of captive insurance company 0 [5] 0 [6]
Foreign currency derivatives 0 [7] 0 [8]
Total assets at fair value 0
Liabilities    
Foreign currency derivatives 0 [9] 0 [10]
Total liabilities at fair value 0  
Fair Value, Inputs, Level 3 [Member] | Total Return Derivatives [Member]    
Assets    
Derivative assets [7] 0  
Fair Value, Inputs, Level 3 [Member] | Commodity Derivatives [Member]    
Assets    
Derivative assets $ 0 [7] $ 0 [8]
[1] Included in restricted investments and $36 million within other current assets in the Condensed Consolidated Balance Sheets
[2] Includes $300 million related to the Asbestos trust and $123 million related to the Environmental trust
[3] Included in restricted investments and $37 million within other current assets in the Condensed Consolidated Balance Sheets
[4] Includes $333 million related to the Asbestos trust and $88 million related to the Environmental trust
[5] Included in other noncurrent assets in the Condensed Consolidated Balance Sheets
[6] Included in other noncurrent assets in the Condensed Consolidated Balance Sheets
[7] Included in accounts receivable in the Condensed Consolidated Balance Sheets
[8] Included in accounts receivable in the Condensed Consolidated Balance Sheets
[9] Included in accrued expenses and other liabilities in the Condensed Consolidated Balance Sheets.
[10] Included in accrued expenses and other liabilities in the Condensed Consolidated Balance Sheets.