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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
Jun. 30, 2020
Sep. 30, 2019
Carrying (Reported) Amount, Fair Value Disclosure [Member]    
ASSETS    
Cash and cash equivalents $ 416 $ 232
Restricted investments 327 [1] 334 [2]
Investment of captive insurance company [3] 7 5
Foreign currency derivatives 1 2
Total assets at fair value 751 573
Liabilities    
Foreign currency derivatives 2 2
Estimate of Fair Value, Fair Value Disclosure [Member]    
ASSETS    
Cash and cash equivalents 416 232
Restricted investments 327 [1] 334 [2]
Investment of captive insurance company [3] 7 5
Foreign currency derivatives 1 2
Total assets at fair value 751 573
Liabilities    
Foreign currency derivatives 2 2
Fair Value, Inputs, Level 1 [Member]    
ASSETS    
Cash and cash equivalents 416 232
Restricted investments 327 [1] 334 [2]
Investment of captive insurance company [3] 7 5
Foreign currency derivatives 0 0
Total assets at fair value 750 571
Liabilities    
Foreign currency derivatives 0 0
Fair Value, Inputs, Level 2 [Member]    
ASSETS    
Cash and cash equivalents 0 0
Restricted investments 0 [1] 0 [2]
Investment of captive insurance company [3] 0 0
Foreign currency derivatives 1 2
Total assets at fair value 1 2
Liabilities    
Foreign currency derivatives 2 2
Fair Value, Inputs, Level 3 [Member]    
ASSETS    
Cash and cash equivalents 0 0
Restricted investments 0 [1] 0 [2]
Investment of captive insurance company [3] 0 0
Foreign currency derivatives 0 0
Total assets at fair value 0 0
Liabilities    
Foreign currency derivatives $ 0 $ 0
[1] Included in restricted investments is $30 million classified in the other current assets caption on the Condensed Consolidated Balance Sheets.
[2] Included in restricted investments is $24 million classified in the other current assets caption on the Condensed Consolidated Balance Sheets.
[3] Included in other noncurrent assets in the Condensed Consolidated Balance Sheets.