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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, 2018
Sep. 30, 2017
Carrying (Reported) Amount, Fair Value Disclosure [Member]    
ASSETS    
Cash and cash equivalents $ 182 $ 566
Restricted investments [1] 334 332
Deferred compensation investments [2] 162 158
Investment of captive insurance company 2 3
Foreign currency derivatives 2 2
Total assets at fair value 682 1,061
Liabilities    
Foreign currency derivatives 3 36
Estimate of Fair Value, Fair Value Disclosure [Member]    
ASSETS    
Cash and cash equivalents 182 566
Restricted investments [1] 334 332
Deferred compensation investments [2] 162 158
Investment of captive insurance company 2 3
Foreign currency derivatives 2 2
Total assets at fair value 682 1,061
Liabilities    
Foreign currency derivatives 3 36
Fair Value, Inputs, Level 1 [Member]    
ASSETS    
Cash and cash equivalents 182 566
Restricted investments [1] 334 332
Deferred compensation investments [2] 0 0
Investment of captive insurance company 2 3
Foreign currency derivatives 0 0
Total assets at fair value 518 901
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] 162 158
Investment of captive insurance company 0 0
Foreign currency derivatives 2 2
Total assets at fair value 164 160
Liabilities    
Foreign currency derivatives 3 36
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.