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PENSION AND POSTRETIREMENT BENEFIT PLANS - Obligations and Funded Status of our Defined Benefit Plans (Details) - USD ($)
$ in Millions
 2 Months Ended 10 Months Ended 12 Months Ended
Dec. 31, 2020
Oct. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Amounts recognized on the balance sheet        
Amounts recognized in accumulated other comprehensive loss   $ (23)    
Pension Benefits        
Amounts recognized on the balance sheet        
Accrued liabilities $ 0   $ 0  
Other long-term liabilities (15)   (18)  
Amounts recognized in the consolidated balance sheets, total (15)   (18)  
Amounts recognized in accumulated other comprehensive loss (1)   (6)  
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit obligation—beginning balance 46 45 56  
Service cost—benefits earned during the period 0 1 1 $ 1
Interest cost on projected benefit obligation 0 1 2 2
Actuarial loss (gain) 3 1 11  
Benefits paid (2) (2) (25)  
Benefit obligation—beginning balance 47 46 45 56
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets—beginning balance 26 27 42  
Actual gain (loss) return on plan assets 2 1 7  
Employer contributions 6 0 3  
Benefits paid (2) (2) (25)  
Fair value of plan assets—ending balance 32 26 27 42
Net benefit liability (unfunded status) (15) (20) (18)  
Postretirement Benefits        
Amounts recognized on the balance sheet        
Accrued liabilities (4)   (3)  
Other long-term liabilities (125)   (113)  
Amounts recognized in the consolidated balance sheets, total (129)   (116)  
Amounts recognized in accumulated other comprehensive loss (7)   (17)  
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit obligation—beginning balance 122 116 84  
Service cost—benefits earned during the period 1 4 4 4
Interest cost on projected benefit obligation 0 3 4 4
Actuarial loss (gain) 7 2 19  
Cost of special termination benefits 0 0 6 0
Curtailment 0 0 2  
Benefits paid (1) (3) (3)  
Benefit obligation—beginning balance 129 122 116 84
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets—beginning balance 0 0 0  
Employer contributions 1 3 3  
Benefits paid (1) (3) (3)  
Fair value of plan assets—ending balance 0 0 0 $ 0
Net benefit liability (unfunded status) $ (129) $ (122) $ (116)