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GOODWILL AND OTHER INTANGIBLE ASSETS Additional Information (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting Information [Line Items]        
Goodwill, Impairment Loss   $ 58    
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount   25.00%    
Reporting Unit, Change In Percentage of Fair Value in Excess of Carrying Amount   0.10    
Impairment of goodwill, intangibles and long lived assets   $ 187 $ 123 $ 156
Goodwill, Impaired, Accumulated Impairment Loss   137    
Amortization expense, intangible assets   60 78 $ 92
Other businesses        
Segment Reporting Information [Line Items]        
Goodwill, Impairment Loss $ 58 58    
Impairment of goodwill, intangibles and long lived assets 133      
Impairment of Intangible Assets (Excluding Goodwill) $ 75   120  
Goodwill, Impaired, Accumulated Impairment Loss   105    
Goodwill, Impairment Loss, Rounded     $ 105  
Canada        
Segment Reporting Information [Line Items]        
Goodwill, Impairment Loss   0    
Goodwill, Impaired, Accumulated Impairment Loss   $ 32    
Pro Forma        
Segment Reporting Information [Line Items]        
Reporting Unit, Impairment Trigger, Pre-Tax Discount Rate   0.03    
Reporting Unit, Impairment Trigger, Decrease In Revenue Long-Term Growth Rate   0.015