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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, 2021 USD ($) MWh MMBbls Bcf | Dec. 31, 2021 GBP (£) MWh MMBbls Bcf | Dec. 31, 2021 EUR (€) MWh MMBbls Bcf | Dec. 31, 2021 JPY (¥) MWh MMBbls Bcf | Dec. 31, 2021 CAD ($) MWh MMBbls Bcf | 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
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Foreign exchange contracts - United States dollar or GBP or Japanese yen forwards - purchase |  |  |  |  |  |  |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |  |  |  |  |  |  |
2021 notional principal | $ 2,508 |  |  | ¥ 72,500 |  |  |  |  |  |
2022 notional principal | 0 |  |  | 0 |  |  |  |  |  |
2023 notional principal | 0 |  |  | 0 |  |  |  |  |  |
2024 notional principal | 0 |  |  | 0 |  |  |  |  |  |
2025 notional principal | 0 |  |  | 0 |  |  |  |  |  |
Thereafter notional principal | 0 |  |  | 0 |  |  |  |  |  |
Total notional principal | 2,508 |  |  | ¥ 72,500 |  | $ 3,522 |  |  | ¥ 72,500 |
Foreign exchange contracts - United States dollar or GBP forwards - sell |  |  |  |  |  |  |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |  |  |  |  |  |  |
2021 notional principal | 9,245 | £ 28 | € 104 |  |  |  |  |  |  |
2022 notional principal | 5,596 | 29 | 92 |  |  |  |  |  |  |
2023 notional principal | 4,346 | 30 | 91 |  |  |  |  |  |  |
2024 notional principal | 3,174 | 30 | 86 |  |  |  |  |  |  |
2025 notional principal | 2,574 | 28 | 85 |  |  |  |  |  |  |
Thereafter notional principal | 492 | 32 | 343 |  |  |  |  |  |  |
Total notional principal | $ 25,427 | £ 177 | € 801 |  |  | $ 17,859 | £ 265 | € 885 |  |
Interest rate contracts - short-term borrowings |  |  |  |  |  |  |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |  |  |  |  |  |  |
2021 notional principal |  |  |  |  | $ 395 |  |  |  |  |
2022 notional principal |  |  |  |  | 47 |  |  |  |  |
2023 notional principal |  |  |  |  | 35 |  |  |  |  |
2024 notional principal |  |  |  |  | 30 |  |  |  |  |
2025 notional principal |  |  |  |  | 26 |  |  |  |  |
Thereafter notional principal |  |  |  |  | 64 |  |  |  |  |
Total notional principal |  |  |  |  | 597 |  |  |  |  | $ 4,635
Interest rate contract - long term debt - Pay Fixed Rate |  |  |  |  |  |  |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |  |  |  |  |  |  |
2021 notional principal |  |  |  |  | 2,363 |  |  |  |  |
2022 notional principal |  |  |  |  | 1,784 |  |  |  |  |
2023 notional principal |  |  |  |  | 1,132 |  |  |  |  |
2024 notional principal |  |  |  |  | 0 |  |  |  |  |
2025 notional principal |  |  |  |  | 0 |  |  |  |  |
Thereafter notional principal |  |  |  |  | 0 |  |  |  |  |
Total notional principal |  |  |  |  | 5,279 |  |  |  |  | 5,396
Equity contracts |  |  |  |  |  |  |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |  |  |  |  |  |  |
2021 notional principal |  |  |  |  | 20 |  |  |  |  |
2022 notional principal |  |  |  |  | 26 |  |  |  |  |
2023 notional principal |  |  |  |  | 21 |  |  |  |  |
2024 notional principal |  |  |  |  | 0 |  |  |  |  |
2025 notional principal |  |  |  |  | 0 |  |  |  |  |
Thereafter notional principal |  |  |  |  | 0 |  |  |  |  |
Total notional principal |  |  |  |  | $ 67 |  |  |  |  | $ 62
Commodity contracts | Natural gas |  |  |  |  |  |  |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |  |  |  |  |  |  |
2021 notional quantity (in bcf, bbl or mbbl) | Bcf | 165 | 165 | 165 | 165 | 165 |  |  |  |  |
2022 notional quantity (in bcf, bbl or mbbl) | Bcf | 18 | 18 | 18 | 18 | 18 |  |  |  |  |
2023 notional quantity (in bcf, bbl or mbbl) | Bcf | 5 | 5 | 5 | 5 | 5 |  |  |  |  |
2024 notional quantity (in bcf, bbl or mbbl) | Bcf | 11 | 11 | 11 | 11 | 11 |  |  |  |  |
2025 notional quantity (in bcf, bbl or mbbl) | Bcf | 0 | 0 | 0 | 0 | 0 |  |  |  |  |
Thereafter notional quantity (in bcf, bbl or mbbl) | Bcf | 0 | 0 | 0 | 0 | 0 |  |  |  |  |
Total notional quantity (in bcf, bbl or mbbl) | Bcf | 199 | 199 | 199 | 199 | 199 | 173 | 173 | 173 | 173 | 173
Commodity contracts | Crude |  |  |  |  |  |  |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |  |  |  |  |  |  |
2021 notional quantity (in bcf, bbl or mbbl) | MMBbls | 12 | 12 | 12 | 12 | 12 |  |  |  |  |
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 | 12 | 12 | 12 | 12 | 12 | 15 | 15 | 15 | 15 | 15
Commodity contracts | Power | Net sell |  |  |  |  |  |  |  |  |  |
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS |  |  |  |  |  |  |  |  |  |
2021 notional quantity (MW/H) | MWh | (43) | (43) | (43) | (43) | (43) |  |  |  |  |
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 | 0 | 0 | 0 | 0 | 0 |  |  |  |  |
Thereafter notional quantity (MW/H) | MWh | 0 | 0 | 0 | 0 | 0 |  |  |  |  |
Total notional quantity (MW/H) | MWh | (43) | (43) | (43) | (43) | (43) | (35) | (35) | (35) | (35) | (35)

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