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FINANCING ARRANGEMENTS - Maturities and Mandatory Payments (Details) - USD ($)
$ in Millions
Oct. 31, 2019
Sep. 30, 2019
May 23, 2019
Mar. 08, 2019
Mar. 26, 2018
Revolving Credit Facility Due June 2023 | Revolving Credit Facility          
Debt Instrument [Line Items]          
Stated interest rate on debt (as a percent)   5.04%      
Unsecured Debt          
Debt Instrument [Line Items]          
Repurchased principal amount         $ 1,500
Unsecured Debt | 5.875% Senior Notes Due May 2023          
Debt Instrument [Line Items]          
Repurchased principal amount     $ 1,118    
Stated interest rate on debt (as a percent)   5.875%   5.875%  
Subsequent Event          
Debt Instrument [Line Items]          
Repurchased principal amount $ 100        
Subsequent Event | Revolving Credit Facility Due June 2023 | Revolving Credit Facility          
Debt Instrument [Line Items]          
Net borrowings $ 200        
Subsequent Event | Unsecured Debt | 5.875% Senior Notes Due May 2023          
Debt Instrument [Line Items]          
Stated interest rate on debt (as a percent) 5.875%