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FRESH START ACCOUNTING - Liabilities Subject to Compromise (Details) - USD ($)
$ in Millions
Oct. 31, 2020
Oct. 31, 2014
Debt Instrument [Line Items]    
Accrued interest on long-term debt $ 164  
Liabilities Subject to Compromise, Total 4,516  
2017 Credit Agreement    
Debt Instrument [Line Items]    
Liabilities subject to compromise gross 1,300  
2016 Credit Agreement    
Debt Instrument [Line Items]    
Liabilities subject to compromise gross 1,000  
Second Lien Notes    
Debt Instrument [Line Items]    
Liabilities subject to compromise gross $ 1,808  
Senior Notes (Unsecured) | 5.5% Senior Notes due 2021    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 0.055% 5.50%
Liabilities subject to compromise gross $ 100  
Senior Notes (Unsecured) | 6% Senior Notes due 2024    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 6.00% 6.00%
Liabilities subject to compromise gross $ 144