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BASIS OF PRESENTATION (Details)
$ in Millions
1 Months Ended
Apr. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
investment
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Organization, Consolidation And Presentation Of Financial Statements [Line Items]                
Number of Investments Impaired | investment       1        
Debt issued $ 4,100              
Stockholders' equity   $ (4,913) $ (3,999)   $ (5,933) $ (5,951) $ (5,307) $ (8,785)
Cumulative Effect of Adoption of Accounting Standards Update                
Organization, Consolidation And Presentation Of Financial Statements [Line Items]                
Stockholders' equity         3      
Retained Earnings                
Organization, Consolidation And Presentation Of Financial Statements [Line Items]                
Stockholders' equity   $ (23,453) $ (22,652)   (23,232) $ (22,061) $ (20,111) $ (18,367)
Retained Earnings | Cumulative Effect of Adoption of Accounting Standards Update                
Organization, Consolidation And Presentation Of Financial Statements [Line Items]                
Stockholders' equity         $ 3