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DERIVATIVE FINANCIAL INSTRUMENTS - Notional Amount of Derivative Instruments Fair Value Through Profit or Loss (Details) $ in Millions | Dec. 31, 2021 USD ($) MMBTU GWh | Dec. 31, 2020 USD ($) MMBTU GWh
--- | --- | ---
Equity derivatives |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | $ 1,800 | $ 1,300
Fair value through profit or loss | Foreign exchange |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | 10,933 | 12,178
Fair value through profit or loss | Foreign exchange | Less than 1 year |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | 8,836 |
Fair value through profit or loss | Foreign exchange | 1 to 5 Years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | 1,829 |
Fair value through profit or loss | Foreign exchange | Thereafter |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | 268 |
Fair value through profit or loss | Interest rates |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | 19,661 | 27,080
Fair value through profit or loss | Interest rates | Less than 1 year |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | 9,409 |
Fair value through profit or loss | Interest rates | 1 to 5 Years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | 10,012 |
Fair value through profit or loss | Interest rates | Thereafter |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | 240 |
Fair value through profit or loss | Equity derivatives |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | 4,353 | $ 2,081
Fair value through profit or loss | Equity derivatives | Less than 1 year |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | 3,334 |
Fair value through profit or loss | Equity derivatives | 1 to 5 Years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | 1,019 |
Fair value through profit or loss | Equity derivatives | Thereafter |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | $ 0 |
Fair value through profit or loss | Energy commodity instrument [Member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal Amount of Commodity Derivatives | GWh | 17,403,000,000 | 13,613,000,000
Fair value through profit or loss | Energy commodity instrument [Member] | Less than 1 year |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal Amount of Commodity Derivatives | GWh | 2,335,000,000 |
Fair value through profit or loss | Energy commodity instrument [Member] | 1 to 5 Years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal Amount of Commodity Derivatives | GWh | 12,602,000,000 |
Fair value through profit or loss | Energy commodity instrument [Member] | Thereafter |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal Amount of Commodity Derivatives | GWh | 2,466,000,000 |
Fair value through profit or loss | Natural gas commodity instrument [Member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal Amount of Commodity Derivatives | MMBTU | 152,753,000 | 38,805,000
Fair value through profit or loss | Natural gas commodity instrument [Member] | Less than 1 year |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal Amount of Commodity Derivatives | MMBTU | 134,298,000 |
Fair value through profit or loss | Natural gas commodity instrument [Member] | 1 to 5 Years |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal Amount of Commodity Derivatives | MMBTU | 18,455,000 |
Fair value through profit or loss | Natural gas commodity instrument [Member] | Thereafter |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal Amount of Commodity Derivatives | MMBTU | 0 |
Elected for hedge accounting | Foreign exchange |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | $ 52,150 | $ 27,106
Elected for hedge accounting | Interest rates |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | $ 36,238 | $ 34,032
Elected for hedge accounting | Energy commodity instrument [Member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal Amount of Commodity Derivatives | GWh | 17,754,000,000 | 13,950,000,000
Elected for hedge accounting | Natural gas commodity instrument [Member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal Amount of Commodity Derivatives | MMBTU | 93,623,000 | 82,664,000
Elected for hedge accounting | Equity derivatives |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | $ 95 | $ 0
Elected for hedge accounting | Less than 1 year | Foreign exchange |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | 16,494 |
Elected for hedge accounting | Less than 1 year | Interest rates |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | $ 11,494 |
Elected for hedge accounting | Less than 1 year | Energy commodity instrument [Member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal Amount of Commodity Derivatives | GWh | 6,165,000,000 |
Elected for hedge accounting | Less than 1 year | Natural gas commodity instrument [Member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal Amount of Commodity Derivatives | MMBTU | 58,741,000 |
Elected for hedge accounting | Less than 1 year | Equity derivatives |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | $ 95 |
Elected for hedge accounting | 1 to 5 Years | Foreign exchange |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | 34,763 |
Elected for hedge accounting | 1 to 5 Years | Interest rates |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | $ 22,846 |
Elected for hedge accounting | 1 to 5 Years | Energy commodity instrument [Member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal Amount of Commodity Derivatives | GWh | 7,780,000,000 |
Elected for hedge accounting | 1 to 5 Years | Natural gas commodity instrument [Member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal Amount of Commodity Derivatives | MMBTU | 34,882,000 |
Elected for hedge accounting | 1 to 5 Years | Equity derivatives |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | $ 0 |
Elected for hedge accounting | Thereafter | Foreign exchange |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | 893 |
Elected for hedge accounting | Thereafter | Interest rates |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | $ 1,898 |
Elected for hedge accounting | Thereafter | Energy commodity instrument [Member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal Amount of Commodity Derivatives | GWh | 3,809,000,000 |
Elected for hedge accounting | Thereafter | Natural gas commodity instrument [Member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal Amount of Commodity Derivatives | MMBTU | 0 |
Elected for hedge accounting | Thereafter | Equity derivatives |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | $ 0 |

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