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CAPITAL STOCK - Schedule of Restricted Stock Activities (Details)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2020
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Weighted Average  Grant-Date  Fair Value        
Total fair value of restricted stock awards vested | $   $ 94 $ 103 $ 111
Altus Midstream LP        
Weighted Average  Grant-Date  Fair Value        
Reverse stock split ratio 0.05      
Restricted Stock        
Units        
Non-vested, beginning balance (in shares) 2,448,000 2,448,000 3,153,000 4,920,000
Granted, Shares (in shares)   1,352,000 1,479,000 608,000
Vested, Shares (in shares)   (1,933,000) (1,899,000) (2,023,000)
Forfeited, Shares (in shares)   (315,000) (285,000) (352,000)
Non-vested, ending balance (in shares)   1,552,000 2,448,000 3,153,000
Weighted Average  Grant-Date  Fair Value        
Non-vested Beginning Balance, Weighted Average Grant Date Fair Value (in USD per share) | $ / shares $ 46.65 $ 46.65 $ 55.54 $ 56.67
Granted, Weighted Average Grant-Date Fair Value (in USD per share) | $ / shares   24.60 36.81 45.59
Vested, Weighted Average Grant-Date Fair Value (in USD per share) | $ / shares   48.65 53.99 55.10
Forfeited, Weighted Average Grant-Date Fair Value (in USD per share) | $ / shares   30.09 45.06 56.69
Non-vested Ending Balance, Weighted Average Grant Date Fair Value (in USD per share) | $ / shares   $ 28.43 $ 46.65 $ 55.54
Total compensation cost related to non-vested awards not yet recognized | $   $ 14    
Unvested restricted stock units (in shares)   1,551,807    
Weighted-average remaining life of unvested restricted stock units   8 months 12 days    
Phantom Units        
Units        
Non-vested, beginning balance (in shares) 5,384,000 5,384,000 1,818,000 59,000
Reverse stock split (in shares)   (1,246,000) 0 0
Granted, Shares (in shares)   3,462,000 4,831,000 1,973,000
Vested, Shares (in shares)   (1,618,000) (616,000) (38,000)
Forfeited, Shares (in shares)   (1,559,000) (649,000) (176,000)
Non-vested, ending balance (in shares)   4,423,000 5,384,000 1,818,000
Weighted Average  Grant-Date  Fair Value        
Total compensation cost related to non-vested awards not yet recognized | $   $ 28    
Phantom Units Issued Based on Per-Share Market Price of Apache Common Stock        
Units        
Granted, Shares (in shares)   3,378,486 3,401,477  
Phantom Units Issued Based on Per-Share Market Price of ALTM Common Stock        
Units        
Granted, Shares (in shares)   83,239 1,429,135