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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - NOTIONAL PRINCIPAL OR QUANTITY INFORMATION (Details)
€ in Millions, ¥ in Millions, £ in Millions, MWh in Millions, MMBbls in Millions, Bcf in Millions, $ in Millions, $ in Millions
Dec. 31, 2020
USD ($)
MWh
MMBbls
Bcf
Dec. 31, 2020
GBP (£)
MWh
MMBbls
Bcf
Dec. 31, 2020
EUR (€)
MWh
MMBbls
Bcf
Dec. 31, 2020
JPY (¥)
MWh
MMBbls
Bcf
Dec. 31, 2020
CAD ($)
MWh
MMBbls
Bcf
Dec. 31, 2019
USD ($)
MWh
MMBbls
Bcf
Dec. 31, 2019
GBP (£)
MWh
MMBbls
Bcf
Dec. 31, 2019
EUR (€)
MWh
MMBbls
Bcf
Dec. 31, 2019
JPY (¥)
MWh
MMBbls
Bcf
Dec. 31, 2019
CAD ($)
MWh
MMBbls
Bcf
Foreign exchange contracts - United States dollar or GBP or Japanese yen forwards - purchase                    
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS                    
2021 notional principal $ 1,772     ¥ 0            
2022 notional principal 1,750     72,500            
2023 notional principal 0     0            
2024 notional principal 0     0            
2025 notional principal 0     0            
Thereafter notional principal 0     0            
Total notional principal 3,522     ¥ 72,500   $ 1,121     ¥ 72,500  
Foreign exchange contracts - United States dollar or GBP forwards - sell                    
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS                    
2021 notional principal 5,718 £ 88 € 94              
2022 notional principal 5,853 28 94              
2023 notional principal 3,784 29 92              
2024 notional principal 1,856 30 91              
2025 notional principal 648 30 86              
Thereafter notional principal 0 60 428              
Total notional principal $ 17,859 £ 265 € 885     $ 19,419 £ 298 € 909    
Interest rate contracts - short-term borrowings                    
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS                    
2021 notional principal         $ 4,036          
2022 notional principal         397          
2023 notional principal         47          
2024 notional principal         35          
2025 notional principal         30          
Thereafter notional principal         90          
Total notional principal         4,635         $ 10,784
Interest rate contract - long term debt - Pay Fixed Rate                    
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS                    
2021 notional principal         2,067          
2022 notional principal         1,992          
2023 notional principal         1,337          
2024 notional principal         0          
2025 notional principal         0          
Thereafter notional principal         0          
Total notional principal         5,396         5,102
Equity contracts                    
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS                    
2021 notional principal         44          
2022 notional principal         7          
2023 notional principal         11          
2024 notional principal         0          
2025 notional principal         0          
Thereafter notional principal         0          
Total notional principal         $ 62         $ 54
Commodity contracts | Natural gas                    
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS                    
2021 notional quantity (in bcf, bbl or mbbl) | Bcf 114 114 114 114 114          
2022 notional quantity (in bcf, bbl or mbbl) | Bcf 32 32 32 32 32          
2023 notional quantity (in bcf, bbl or mbbl) | Bcf 13 13 13 13 13          
2024 notional quantity (in bcf, bbl or mbbl) | Bcf 3 3 3 3 3          
2025 notional quantity (in bcf, bbl or mbbl) | Bcf 11 11 11 11 11          
Thereafter notional quantity (in bcf, bbl or mbbl) | Bcf 0 0 0 0 0          
Total notional quantity (in bcf, bbl or mbbl) | Bcf 173 173 173 173 173 (1) (1) (1) (1) (1)
Commodity contracts | Crude oil                    
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS                    
2021 notional quantity (in bcf, bbl or mbbl) | MMBbls 14 14 14 14 14          
2022 notional quantity (in bcf, bbl or mbbl) | MMBbls 1 1 1 1 1          
2023 notional quantity (in bcf, bbl or mbbl) | MMBbls 0 0 0 0 0          
2024 notional quantity (in bcf, bbl or mbbl) | MMBbls 0 0 0 0 0          
2025 notional quantity (in bcf, bbl or mbbl) | MMBbls 0 0 0 0 0          
Thereafter notional quantity (in bcf, bbl or mbbl) | MMBbls 0 0 0 0 0          
Total notional quantity (in bcf, bbl or mbbl) | MMBbls 15 15 15 15 15 28 28 28 28 28
Commodity contracts | NGL                    
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS                    
2021 notional quantity (in bcf, bbl or mbbl) | MMBbls 0 0 0 0 0          
2022 notional quantity (in bcf, bbl or mbbl) | MMBbls 0 0 0 0 0          
2023 notional quantity (in bcf, bbl or mbbl) | MMBbls 0 0 0 0 0          
2024 notional quantity (in bcf, bbl or mbbl) | MMBbls 0 0 0 0 0          
2025 notional quantity (in bcf, bbl or mbbl) | MMBbls 0 0 0 0 0          
Thereafter notional quantity (in bcf, bbl or mbbl) | MMBbls 0 0 0 0 0          
Total notional quantity (in bcf, bbl or mbbl) | MMBbls 0 0 0 0 0 2 2 2 2 2
Commodity contracts | Power | Net sell                    
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS                    
2021 notional quantity (MW/H) | MWh (3) (3) (3) (3) (3)          
2022 notional quantity (MW/H) | MWh (43) (43) (43) (43) (43)          
2023 notional quantity (MW/H) | MWh (43) (43) (43) (43) (43)          
2024 notional quantity (MW/H) | MWh (43) (43) (43) (43) (43)          
2025 notional quantity (MW/H) | MWh (43) (43) (43) (43) (43)          
Thereafter notional quantity (MW/H) | MWh 0 0 0 0 0          
Total notional quantity (MW/H) | MWh (35) (35) (35) (35) (35) (16) (16) (16) (16) (16)