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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) MMBTU | Dec. 31, 2020 USD ($) MMBTU
Disclosure of detailed information about hedging instruments [line items] |  |
Unrealised Gains (Losses) On Change In Fair Value Of Derivatives | $ 704 | $ 540
Equity derivatives |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | 1,800 | 1,300
Interest Rate Swap and Forward Starting Swap Contracts [Member] |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | 28,600 | 30,200
Interest Rate Swaptions |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | 200 | 3,900
Interest Rate Cap Contracts |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Derivative, Notional Amount | 27,100 | 27,000
Foreign exchange |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Unrealised Gains (Losses) On Change In Fair Value Of Derivatives | (53) | 41
Gains (losses) on hedges of net investments in foreign operations, net of tax | 367 | 28
Derivative, Notional Amount | 63,083 | 39,284
Equity derivatives |  |
Disclosure of detailed information about hedging instruments [line items] |  |
Unrealised Gains (Losses) On Change In Fair Value Of Derivatives | 757 | 850
Derivative, Notional Amount | $ 4,448 | $ 2,081
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

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