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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
Dec. 31, 2018
Sep. 30, 2018
Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Assets    
Cash and cash equivalents $ 149 $ 294
Restricted investments [1] 309 342
Deferred compensation investments [2] 161 165
Investment of captive insurance company 3 3
Foreign currency derivatives 2 11
Total assets at fair value 624 815
Liabilities    
Foreign currency derivatives 1 3
Estimate of Fair Value, Fair Value Disclosure [Member]    
Assets    
Cash and cash equivalents 149 294
Restricted investments [1] 309 342
Deferred compensation investments [2] 161 165
Investment of captive insurance company 3 3
Foreign currency derivatives 2 11
Total assets at fair value 624 815
Liabilities    
Foreign currency derivatives 1 3
Fair Value, Inputs, Level 1 [Member]    
Assets    
Cash and cash equivalents 149 294
Restricted investments [1] 309 342
Deferred compensation investments [2] 0 0
Investment of captive insurance company 3 3
Foreign currency derivatives 0 0
Total assets at fair value 461 639
Liabilities    
Foreign currency derivatives 0 0
Fair Value, Inputs, Level 2 [Member]    
Assets    
Cash and cash equivalents 0 0
Restricted investments [1] 0 0
Deferred compensation investments [2] 161 165
Investment of captive insurance company 0 0
Foreign currency derivatives 2 11
Total assets at fair value 163 176
Liabilities    
Foreign currency derivatives 1 3
Fair Value, Inputs, Level 3 [Member]    
Assets    
Cash and cash equivalents 0 0
Restricted investments [1] 0 0
Deferred compensation investments [2] 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 $30 million classified in the other current assets caption on the Condensed Consolidated Balance Sheets.
[2] Included in other noncurrent assets in the Condensed Consolidated Balance Sheets.