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CAPITAL STOCK - Schedule of Performance Program Activities (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Weighted Average  Grant-Date  Fair Value      
Expired, weighted average exercise price (in USD per share) $ 92.14 $ 88.82 $ 104.21
Employee-related liabilities, current $ 170 $ 212  
Performance Program | Stock-settled conditional restricted stock unit      
Units      
Non-vested, beginning balance (in shares) 781,000    
Granted, Shares (in shares) 18,000    
Vested, Shares (in shares) (445,000)    
Forfeited, Shares (in shares) (16,000)    
Expired, Shares (in shares) (227,000)    
Non-vested, ending balance (in shares) 111,126 781,000  
Weighted Average  Grant-Date  Fair Value      
Non-vested Beginning Balance, Weighted Average Grant Date Fair Value (in USD per share) $ 52.69    
Granted, Weighted Average Grant-Date Fair Value (in USD per share) 62.31    
Vested, Weighted Average Grant-Date Fair Value (in USD per share) 41.10    
Forfeited, Weighted Average Grant-Date Fair Value (in USD per share) 56.66    
Expired, weighted average exercise price (in USD per share) 70.70    
Non-vested Ending Balance, Weighted Average Grant Date Fair Value (in USD per share) $ 63.15 $ 52.69  
Fair value of restricted stock, risk-free interest rate, period 3 years    
Total compensation cost related to non-vested awards not yet recognized $ 0    
Weighted-average remaining life of unvested restricted stock units 0 years    
Performance Program | Cash-settled conditional restricted stock unit      
Units      
Non-vested, beginning balance (in shares) 2,320,000    
Granted, Shares (in shares) 1,687,000    
Vested, Shares (in shares) (2,000)    
Forfeited, Shares (in shares) (542,000)    
Expired, Shares (in shares) (46,000)    
Non-vested, ending balance (in shares) 3,417,000 2,320,000  
Weighted Average  Grant-Date  Fair Value      
Employee-related liabilities, current $ 14