FAIR VALUE OF FINANCIAL INSTRUMENTS - Valuation Techniques on Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Line Items]
Financial liabilities	$ 40,783	$ 33,644
Recurring fair value measurement | Level 2
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Line Items]
Financial assets	4,968	4,851
Financial liabilities	348	722
Recurring fair value measurement | Level 3
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Line Items]
Financial assets	297	341	$ 287
Financial liabilities	498	11	$ 37
Recurring fair value measurement | Derivative assets/liabilities | Level 2
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Line Items]
Financial liabilities	348	722
Recurring fair value measurement | Derivative assets/liabilities | Level 2 | Market approach
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Line Items]
Financial liabilities	348	722
Recurring fair value measurement | Derivative assets/liabilities | Level 3
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Line Items]
Financial liabilities	19	0
Recurring fair value measurement | Other financial liabilities, contingent consideration | Level 3 | Discounted cash flows
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Line Items]
Financial liabilities	411	0
Recurring fair value measurement | Corporate and government bonds | Level 2
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Line Items]
Financial assets	3,956	4,049
Recurring fair value measurement | Corporate and government bonds | Level 2 | Market approach
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Line Items]
Financial assets	3,956	4,049
Recurring fair value measurement | Corporate and government bonds | Level 3
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Line Items]
Financial assets	0	0
Recurring fair value measurement | Derivative assets/liabilities | Level 2
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Line Items]
Financial assets	300	231
Recurring fair value measurement | Derivative assets/liabilities | Level 2 | Market approach
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Line Items]
Financial assets	300	231
Recurring fair value measurement | Derivative assets/liabilities | Level 3
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Line Items]
Financial assets	0	0
Recurring fair value measurement | Other financial assets | Level 2
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Line Items]
Financial assets	712	571
Recurring fair value measurement | Other financial assets | Level 2 | Market approach
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Line Items]
Financial assets	712	571
Recurring fair value measurement | Other financial assets | Level 3
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Line Items]
Financial assets	297	341
Recurring fair value measurement | Other financial assets - secured debentures | Level 3 | Discounted cash flows
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Line Items]
Financial assets	144	254
Recurring fair value measurement | Other financial assets - equity instruments designated as measured at FVOCI | Level 3 | Private share trade comparables
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Line Items]
Financial assets	143	77
Recurring fair value measurement | Other financial assets - debt instruments measured at FVTPL | Level 3 | Discounted cash flows
Disclosure Of Significant Unobservable Inputs Used In Fair Value Measurements Of Assets And Liabilities [Line Items]
Financial assets	$ 10	$ 9