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DERIVATIVE FINANCIAL INSTRUMENTS - Hedge Classification (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) GWh MMBTU | Dec. 31, 2022 USD ($) | Dec. 31, 2022 GWh | Dec. 31, 2022 MMBTU
Cash flow hedges |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |
Nominal amount of derivative positions | $ 84,119 | $ 49,199 |  |
Gains (losses) on cash flow hedges, before tax | (754) | 2,081 |  |
Ineffective Portion | (12) | 13 |  |
Net investment hedges |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |
Nominal amount of derivative positions | 45,979 | 35,438 |  |
Gains (losses) on hedges of net investments in foreign operations, before tax | (1,200) | 2,998 |  |
Ineffective Portion | 0 | 0 |  |
Cash flow hedges and hedges of net investment in foreign operations [Member] |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |
Nominal amount of derivative positions | 130,098 | 84,637 |  |
Gain (loss) on hedge effectiveness recognised in other comprehensive income | (1,954) | 5,079 |  |
Ineffective Portion | $ (12) | $ 13 |  |
Energy commodity instrument [Member] |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |
Nominal Amount of Commodity Derivatives | GWh | 98,345 |  | 69,902 |
Energy commodity instrument [Member] | Cash flow hedges |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |
Nominal Amount of Commodity Derivatives | GWh | 28,952 |  | 18,133 |
Natural gas commodity instrument [Member] |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |
Nominal Amount of Commodity Derivatives | 144,104,000 |  | 128,381,000 | 128,381,000
Natural gas commodity instrument [Member] | Cash flow hedges |  |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |  |
Nominal Amount of Commodity Derivatives | MMBTU | 49,386,000 |  |  | 67,803,000

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