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EQUITY - Changes in Shareholders' Equity (Details) - USD ($)
shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jan. 01, 2020
Jan. 01, 2019
Changes in Shareholders' Equity        
Balances, beginning of period $ 437 $ 624    
Net income 125 25    
Distributions paid to noncontrolling interests (40) (37)    
Other comprehensive income 1 2    
Accretion of redeemable noncontrolling interests (1) (5)    
Purchases (sales) of businesses and noncontrolling interests (15) 0    
Cumulative effect of accounting change     $ (14) $ 1
Stock-based compensation expense, tax benefit and issuance of common stock 10 8    
Balances, end of period $ 503 $ 618    
Common Stock        
Changes in Shareholders' Equity        
Balances, beginning of period (in shares) 104,197 102,537    
Balances, beginning of period $ 7 $ 7    
Stock-based compensation expense, tax benefit and issuance of common stock (in shares) 331 543    
Balances, end of period (in shares) 104,528 103,080    
Balances, end of period $ 7 $ 7    
Additional Paid-In Capital        
Changes in Shareholders' Equity        
Balances, beginning of period 4,760 4,747    
Accretion of redeemable noncontrolling interests (1) (5)    
Purchases (sales) of businesses and noncontrolling interests (30) (2)    
Stock-based compensation expense, tax benefit and issuance of common stock 10 8    
Balances, end of period 4,739 4,748    
Accumulated Other Comprehensive Loss        
Changes in Shareholders' Equity        
Balances, beginning of period (257) (223)    
Other comprehensive income 1 2    
Cumulative effect of accounting change       0
Balances, end of period (256) (221)    
Accumulated Deficit        
Changes in Shareholders' Equity        
Balances, beginning of period (2,513) (2,299)    
Net income 93 (12)    
Cumulative effect of accounting change     $ (14) $ 1
Balances, end of period (2,434) (2,310)    
Treasury Stock        
Changes in Shareholders' Equity        
Balances, beginning of period (2,414) (2,414)    
Stock-based compensation expense, tax benefit and issuance of common stock   0    
Balances, end of period (2,414) (2,414)    
Noncontrolling Interests        
Changes in Shareholders' Equity        
Balances, beginning of period 854 806    
Net income 32 37    
Distributions paid to noncontrolling interests (40) (37)    
Purchases (sales) of businesses and noncontrolling interests 15 2    
Balances, end of period $ 861 $ 808