FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation Techniques on Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
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