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CAPITAL STOCK - Performance Program Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares authorized and available for grant (in shares)           14,100,000    
Compensation expense           $ 40 $ 110 $ 157
Stock-settled and cash-settled compensation capitalized           $ 7 $ 28 $ 37
Phantom Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Awards granted during period (in shares)           3,462,000 4,831,000 1,973,000
Phantom Units | Subsequent Event                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Awards granted during period (in shares) 4,360,656              
Performance Program                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares allocation percentage           50.00%    
Shares vesting period           3 years    
Compensation expense           $ 8 $ 24 $ 38
Stock-settled and cash-settled compensation capitalized           $ 1 $ 3 $ 7
Performance Program | Vesting, Tranche One                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares vesting percentage           50.00%    
Performance Program | Vesting, Tranche Two                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares vesting percentage           50.00%    
2017 Performance Program | Conditional Restricted Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Awards granted during period (in shares)         620,885      
Shares paid out as percentage of target           54.00%    
Total awards, outstanding (in shares)           111,126    
2018 Performance Program | Phantom Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Awards granted during period (in shares)       931,049        
Shares paid out as percentage of target           23.00%    
Total awards, outstanding (in shares)           704,483    
2019 Performance Program | Phantom Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Awards granted during period (in shares)     1,679,832          
Total awards, outstanding (in shares)           1,301,893    
2019 Performance Program | Phantom Units | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percentage of shares awarded of target     0.00%          
Shares authorized and available for grant (in shares)   0            
2019 Performance Program | Phantom Units | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percentage of shares awarded of target     200.00%          
Shares authorized and available for grant (in shares)     2,603,786          
2020 Performance Program | Phantom Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Awards granted during period (in shares)   1,687,307            
Total awards, outstanding (in shares)           1,410,404    
2020 Performance Program | Phantom Units | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percentage of shares awarded of target   0.00%            
Shares authorized and available for grant (in shares)   0            
2020 Performance Program | Phantom Units | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Percentage of shares awarded of target   200.00%            
Shares authorized and available for grant (in shares)   2,820,808            
2021 Performance Program                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares allocation percentage           50.00%    
2021 Performance Program | Subsequent Event                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares allocation percentage 50.00%              
Shares vesting period 3 years              
Shares vesting percentage 50.00%              
2021 Performance Program | Phantom Units | Subsequent Event                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Initial number of share to be awarded 1,911,517              
2021 Performance Program | Phantom Units | Monte Carlo Simulation | Subsequent Event                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Weighted average grant date fair value per share (in USD per share) $ 23.73              
2021 Performance Program | Phantom Units | Fair Market Value At Grant Date | Subsequent Event                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares allocation percentage 50.00%              
Weighted average grant date fair value per share (in USD per share) $ 16.18              
2021 Performance Program | Phantom Units | Minimum | Subsequent Event                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Ultimate number of share to be awarded 0              
2021 Performance Program | Phantom Units | Maximum | Subsequent Event                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Ultimate number of share to be awarded 3,823,034