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Income Taxes - Summary of Income from Continuing Operations Before Income Taxes and Reconciliation of Provision for Income Taxes (Parenthetical) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Tax Credit Carryforward [Line Items]        
Valuation allowance charges [1] $ 14 $ (2) $ (3)  
State taxes [2] (5) (3) (16)  
Other items [3] 25 24 27  
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount   2 5  
Domestic items [4] $ 15 $ 3 $ (69)  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 24.50% 35.00% 35.00%
Foreign tax credits $ 17 $ 54 $ 29  
Additional unfavorable adjustment 29      
Gain recognition in foreign dividend and other restructuring   6    
Deemed inclusions   13    
Tax restructuring costs   23    
Valvoline [Member]        
Tax Credit Carryforward [Line Items]        
State taxes   26 6  
Other items     4  
GILTI [Member]        
Tax Credit Carryforward [Line Items]        
Other items 19      
Foreign Tax Authority [Member]        
Tax Credit Carryforward [Line Items]        
Valuation allowance charges 9 5 25  
Other items   22 7  
Tax reform benefit and expense   4    
State and Local Jurisdiction [Member]        
Tax Credit Carryforward [Line Items]        
Valuation allowance charges 5   22  
Other items   27    
Domestic Tax Authority [Member]        
Tax Credit Carryforward [Line Items]        
Domestic items     $ 6  
Tax reform benefit and expense   2    
Transition Tax [Member]        
Tax Credit Carryforward [Line Items]        
Tax reform benefit and expense $ 29 187    
Foreign tax credits   46    
Deferred Rate [Member]        
Tax Credit Carryforward [Line Items]        
Tax reform benefit and expense   $ 139    
[1] 2019 includes $5 million related to state tax NOL’s and $9 million related to a foreign jurisdiction. 2018 includes a $5 million benefit for the release of a foreign tax credit valuation allowance; 2017 includes $25 million of benefit for the release of a foreign tax credit valuation allowance and $22 million of expense for state, foreign and domestic federal deferred tax asset valuation allowances net of a NOL write-off offset.
[2] 2018 includes a $27 million tax benefit for a valuation reserve release against state net operating losses and $26 million of tax expense for state tax rate changes; 2017 includes $6 million of benefit for state tax rate changes primarily related to the final distribution of Valvoline.
[3] 2019 includes $19 million primarily related to GILTI permanent adjustments. 2018 includes $22 million related to foreign withholding taxes; 2017 includes $7 million of expense related to foreign withholding taxes, $5 million of expense for the write-off of a prepaid asset related to an intercompany transaction with a Valvoline legal entity, $4 million of expense for non-deductible transaction costs primarily related to the Valvoline spin-off and $6 million of benefit for certain other domestic permanent items.
[4] The domestic tax rates are 35% for 2017 and 24.5% for 2018.  For 2019 and forward, the domestic tax rate is expected to be 21%.