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DERIVATIVE FINANCIAL INSTRUMENTS - Hedge Classification (Details) bbl in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) MMBTU GWh bbl | Dec. 31, 2020 USD ($) GWh MMBTU bbl
Cash flow hedges |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of derivative positions | $ 43,776 | $ 39,128
Gains (losses) on cash flow hedges, before tax | 582 | (479)
Ineffective Portion | 24 | 10
Net investment hedges |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal amount of derivative positions | 43,997 | 17,788
Gains (losses) on hedges of net investments in foreign operations, before tax | 407 | 182
Ineffective Portion | (14) | 10
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 | 87,773 | 56,916
Gain (loss) on hedge effectiveness recognised in other comprehensive income | 989 | (297)
Ineffective Portion | $ 10 | $ 20
Oil and gas assets [member] | Cash flow hedges |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Number in Barrels of Commodity Derivatives | bbl | 1,152 | 1,302
Energy commodity instrument [Member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal Amount of Commodity Derivatives | GWh | 35,156 | 27,564
Energy commodity instrument [Member] | Cash flow hedges |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal Amount of Commodity Derivatives | GWh | 17,753 | 13,950
Natural gas commodity instrument [Member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal Amount of Commodity Derivatives | MMBTU | 246,375,000 | 121,468,000
Natural gas commodity instrument [Member] | Cash flow hedges |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Nominal Amount of Commodity Derivatives | MMBTU | 93,623,000 | 82,663,000

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