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FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation Techniques on Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial assets | $ 44,558 | $ 41,335
Financial liabilities | (227,064) | (197,540)
Level 2 |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial assets | 8,743 | 8,520
Financial liabilities | (4,285) | (5,167)
Level 2 | Accounts payable and other |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial liabilities | (4,150) | (5,090)
Level 2 | Accounts payable and other | Discounted cash flows |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial liabilities | (4,150) |
Level 2 | Redeemable fund units (subsidiary equity obligations) |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial liabilities | (135) | (77)
Level 2 | Redeemable fund units (subsidiary equity obligations) | Market approach |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial liabilities | (135) |
Level 2 | Accounts receivable and other |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial assets | 2,265 | 1,581
Level 2 | Other financial assets | Market approach |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial assets | 6,478 |
Level 2 | Fixed income securities and other |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial assets | 1,908 | 912
Level 2 | Corporate bonds |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial assets | 2,050 | 2,764
Level 2 | Common shares and warrants |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial assets | 548 | 577
Level 3 |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial assets | 2,232 | 2,369
Financial liabilities | (2,714) | (2,104)
Level 3 | Accounts payable and other |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial liabilities | (1,311) | (724)
Level 3 | Accounts payable and other | Discounted cash flows |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial liabilities | (1,311) |
Level 3 | Redeemable fund units (subsidiary equity obligations) |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial liabilities | (1,403) | (1,380)
Level 3 | Redeemable fund units (subsidiary equity obligations) | Discounted cash flows |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial liabilities | (1,403) |
Level 3 | Accounts receivable and other |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial assets | 77 | 135
Level 3 | Fixed income securities and other |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial assets | 451 | 491
Level 3 | Fixed income securities and other | Discounted cash flows |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial assets | 451 |
Level 3 | Corporate bonds |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial assets |  | 286
Level 3 | Corporate bonds | Discounted cash flows |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial assets | 383 |
Level 3 | Common shares and warrants |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial assets | 1,316 | $ 1,389
Level 3 | Common shares and warrants | Black-Scholes model |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial assets | 1,316 |
Level 3 | Accounts receivable and other | Discounted cash flows |  |
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Table] [Line Items] |  |
Financial assets | $ 77 |

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