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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, 2019
Sep. 30, 2018
Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Assets    
Cash and cash equivalents $ 132 $ 294
Restricted investments 329 [1] 342 [2]
Deferred compensation investments [3] 168 165
Investment of captive insurance company 4 3
Foreign currency derivatives 3 11
Total assets at fair value 636 815
Liabilities    
Foreign currency derivatives 3 3
Estimate of Fair Value, Fair Value Disclosure [Member]    
Assets    
Cash and cash equivalents 132 294
Restricted investments 329 [1] 342 [2]
Deferred compensation investments [3] 168 165
Investment of captive insurance company 4 3
Foreign currency derivatives 3 11
Total assets at fair value 636 815
Liabilities    
Foreign currency derivatives 3 3
Fair Value, Inputs, Level 1 [Member]    
Assets    
Cash and cash equivalents 132 294
Restricted investments 329 [1] 342 [2]
Deferred compensation investments [3] 0 0
Investment of captive insurance company 4 3
Foreign currency derivatives 0 0
Total assets at fair value 465 639
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]
Deferred compensation investments [3] 168 165
Investment of captive insurance company 0 0
Foreign currency derivatives 3 11
Total assets at fair value 171 176
Liabilities    
Foreign currency derivatives 3 3
Fair Value, Inputs, Level 3 [Member]    
Assets    
Cash and cash equivalents 0 0
Restricted investments 0 [1] 0 [2]
Deferred compensation investments [3] 0 0
Investment of captive insurance company 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 $19 million classified in the other current assets caption on the Condensed Consolidated Balance Sheets.
[2] Included in restricted investments is $30 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.