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REDEEMABLE NONCONTROLLING INTERESTS (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Aug. 23, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Temporary Equity [Line Items]        
Issuance of redeemable subsidiary preferred equity, net of issuance costs $ 1,025   $ 985  
Liquidation preference (in dollars per share) $ 1,000      
Redemption price, percent 100.00% 100.00% 100.00%  
Aggregate liquidation preference $ 1,025      
Percent of dividend required to redeem 75.00%      
Dividends accrued during the period   $ 36 $ 33 $ 0
Redeemable subsidiary preferred equity   170 700  
Aggregate redemption price   550 $ 300  
Redeemable noncontrolling interests   22    
November 22, 2019 to February 19, 2020        
Temporary Equity [Line Items]        
Redemption price, percent 100.00%      
February 20, 2020 to August 22, 2020        
Temporary Equity [Line Items]        
Redemption price, percent 102.00%      
August 23, 2020 to August 22, 2021        
Temporary Equity [Line Items]        
Redemption price, percent 103.00%      
August 23, 2021 to August 22, 2022        
Temporary Equity [Line Items]        
Redemption price, percent 103.00%      
August 23, 2022 to August 22, 2023        
Temporary Equity [Line Items]        
Redemption price, percent 101.00%      
August 23, 2023 and Thereafter        
Temporary Equity [Line Items]        
Redemption price, percent 100.00%      
London Interbank Offered Rate (LIBOR), Floor        
Temporary Equity [Line Items]        
Basis spread on variable rate 0.75%      
LIBOR        
Temporary Equity [Line Items]        
Basis spread on variable rate 7.50%      
London Interbank Offered Rate (LIBOR), Paid In Kind        
Temporary Equity [Line Items]        
Basis spread on variable rate 8.00%      
August 23, 2019        
Temporary Equity [Line Items]        
Dividend rate step-ups per annum 0.50%      
August 23, 2019 | LIBOR        
Temporary Equity [Line Items]        
Basis spread cap on variable rate 10.50%      
February 23, 2028        
Temporary Equity [Line Items]        
Dividend rate increase 1.50%      
Dividend rate increase each six months thereafter 0.50%      
Dividend rate increase if no redemption occurs 2.00%      
February 23, 2028 | LIBOR        
Temporary Equity [Line Items]        
Basis spread cap on variable rate 14.00%      
30-Day Period Following January 2, 2020        
Temporary Equity [Line Items]        
Non-controlling equity holder right to sell, fair market sale value   $ 376    
Redeemable Subsidiary Preferred Equity        
Temporary Equity [Line Items]        
Number of units redeemed (in shares)   550,000 300,000