XML 212 R55.htm IDEA: XBRL DOCUMENT v3.20.1
Financing Arrangements - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Apr. 06, 2020
Sep. 30, 2019
Jun. 11, 2018
Dec. 15, 2017
Debt Instrument [Line Items]                
Document Period End Date     Mar. 31, 2020          
Debt face amount $ 2,974,000,000   $ 2,974,000,000     $ 3,224,000,000    
Letters of credit outstanding $ 0   $ 0          
Weighted average contractual interest rate of debt 6.10%   6.10%     6.30%    
Amortization of debt issuance costs $ 5,000,000 $ 4,000,000 $ 9,000,000 $ 8,000,000        
Subsequent Event                
Debt Instrument [Line Items]                
Letters of credit outstanding         $ 50,000,000      
Term Loan Credit Agreement due December 15, 2024                
Debt Instrument [Line Items]                
Repayments of Debt     250,000,000          
Term Loan                
Debt Instrument [Line Items]                
Debt face amount 2,624,000,000   2,624,000,000     $ 2,874,000,000    
Interest expense on debt 40,000,000 50,000,000 86,000,000 100,000,000        
Line of Credit | Revolving Credit Facility | ABL Credit Agreement                
Debt Instrument [Line Items]                
Line of credit facility, current borrowing capacity               $ 300,000,000
Line of Credit | Letter of Credit | ABL Credit Agreement                
Debt Instrument [Line Items]                
Letters of credit, maximum amount               $ 150,000,000
Letters of credit outstanding 39,000,000   39,000,000          
Letter of credit, remaining borrowing capacity 97,000,000   97,000,000          
Convertible Notes                
Debt Instrument [Line Items]                
Debt face amount 350,000,000   350,000,000     $ 350,000,000    
Interest rate, stated percentage             2.25%  
Interest expense on debt $ 7,000,000 $ 6,000,000 $ 13,000,000 $ 12,000,000        
Effective interest rate 9.20%   9.20%     9.20%    
Over-Allotment Option | Convertible Notes                
Debt Instrument [Line Items]                
Debt face amount             $ 50,000,000