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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Notional Principal or Quantity Information (Details) - Jun. 30, 2021
€ in Millions, ¥ in Millions, £ in Millions, $ in Millions, $ in Millions
USD ($)
MWh
MMBbls
Bcf
GBP (£)
MWh
MMBbls
Bcf
EUR (€)
MWh
MMBbls
Bcf
JPY (¥)
MWh
MMBbls
Bcf
CAD ($)
MWh
MMBbls
Bcf
Foreign exchange contracts - forwards - purchase | United States dollar          
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS          
2020 $ 1,364        
2021 1,750        
2022 0        
2023 0        
2024 0        
Thereafter 0        
Derivative Notional Amount Outstanding 3,114        
Foreign exchange contracts - forwards - purchase | Japanese yen          
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS          
2020 | ¥       ¥ 0  
2021 | ¥       72,500  
2022 | ¥       0  
2023 | ¥       0  
2024 | ¥       0  
Thereafter | ¥       0  
Derivative Notional Amount Outstanding | ¥       ¥ 72,500  
Foreign exchange contracts - forwards - sell | United States dollar          
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS          
2020 3,140        
2021 5,853        
2022 3,784        
2023 1,856        
2024 648        
Thereafter 0        
Derivative Notional Amount Outstanding $ 15,281        
Foreign exchange contracts - forwards - sell | GBP          
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS          
2020 | £   £ 67      
2021 | £   28      
2022 | £   29      
2023 | £   30      
2024 | £   30      
Thereafter | £   60      
Derivative Notional Amount Outstanding | £   £ 244      
Foreign exchange contracts - forwards - sell | Euro          
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS          
2020 | €     € 47    
2021 | €     94    
2022 | €     92    
2023 | €     91    
2024 | €     86    
Thereafter | €     428    
Derivative Notional Amount Outstanding | €     € 838    
Interest rate contracts - short-term borrowings          
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS          
2020         $ 1,963
2021         391
2022         47
2023         35
2024         30
Thereafter         90
Derivative Notional Amount Outstanding         2,556
Interest rate contracts - long-term debt pay fixed rate          
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS          
2020         1,062
2021         1,967
2022         1,319
2023         0
2024         0
Thereafter         0
Derivative Notional Amount Outstanding         4,348
Equity contracts          
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS          
2020         39
2021         7
2022         11
2023         0
2024         0
Thereafter         0
Derivative Notional Amount Outstanding         $ 57
Commodity contracts | Natural gas          
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS          
2021 (bcf / mmbbls) | Bcf 81 81 81 81 81
2022 (bcf / mmbbls) | Bcf 48 48 48 48 48
2023 (bcf / mmbbls) | Bcf 12 12 12 12 12
2024 (bcf / mmbbls) | Bcf 4 4 4 4 4
2025 (bcf / mmbbls) | Bcf 11 11 11 11 11
Thereafter (bcf / mmbbls) | Bcf 0 0 0 0 0
Derivative Nonmonetary Notional Amount Outstanding | Bcf 156 156 156 156 156
Commodity contracts | Crude          
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS          
2021 (bcf / mmbbls) | MMBbls 13 13 13 13 13
2022 (bcf / mmbbls) | MMBbls 0 0 0 0 0
2023 (bcf / mmbbls) | MMBbls 0 0 0 0 0
2024 (bcf / mmbbls) | MMBbls 0 0 0 0 0
2025 (bcf / mmbbls) | MMBbls 0 0 0 0 0
Thereafter (bcf / mmbbls) | MMBbls 0 0 0 0 0
Derivative Nonmonetary Notional Amount Outstanding | MMBbls 13 13 13 13 13
Net purchase | Commodity contracts | Power          
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS          
2021 (MWH) | MWh (41) (41) (41) (41) (41)
Net sell | Commodity contracts | Power          
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS          
2022 (MWH) | MWh (43) (43) (43) (43) (43)
2023 (MWH) | MWh (43) (43) (43) (43) (43)
2024 (MWH) | MWh (43) (43) (43) (43) (43)
2025 (MWH) | MWh (43) (43) (43) (43) (43)
Thereafter (MWH) | MWh 0 0 0 0 0
Total (MWH) | MWh (43) (43) (43) (43) (43)