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FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying and Fair Values of Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of financial assets [line items] |  |
Financial assets, carrying value | $ 44,558 | $ 41,335
Financial assets, at fair value | 44,558 | 41,335
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 223,744 | 193,217
Financial liabilities | 227,064 | 197,540
Corporate borrowings |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 10,875 | 9,077
Financial liabilities | 11,993 | 10,540
Property-specific borrowings |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 152,008 | 128,556
Financial liabilities | 153,844 | 131,099
Subsidiary borrowings |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 13,049 | 10,768
Financial liabilities | 13,415 | 11,085
Property-specific borrowings and subsidiary borrowings [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 165,057 | 139,324
Financial liabilities | 167,259 | 142,184
Accounts payable and other |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 43,504 | 41,117
Financial liabilities | 43,504 | 41,117
Subsidiary equity obligations |  |
Disclosure of financial liabilities [line items] |  |
Financial liabilities | 4,308 | 3,699
Financial liabilities | 4,308 | 3,699
Equity investments [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets, carrying value | 5,927 | 6,514
Financial assets, at fair value | 5,927 | 6,514
Loans and notes receivables |  |
Disclosure of financial assets [line items] |  |
Financial assets, carrying value | 2,837 | 2,696
Financial assets, at fair value | 2,837 | 2,696
Cash And Cash Equivalents1 |  |
Disclosure of financial assets [line items] |  |
Financial assets, carrying value | 12,694 | 9,933
Financial assets, at fair value | 12,694 | 9,933
Other financial assets |  |
Disclosure of financial assets [line items] |  |
Financial assets, carrying value | 16,546 | 17,730
Financial assets, at fair value | 16,546 | 17,730
Trade receivables and other [Member] |  |
Disclosure of financial assets [line items] |  |
Financial assets, carrying value | 15,318 | 13,672
Financial assets, at fair value | 15,318 | 13,672
Loans to government [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets, carrying value | 2,020 | 2,651
Financial assets, at fair value | 2,020 | 2,651
Loans to corporate entities [member] |  |
Disclosure of financial assets [line items] |  |
Financial assets, carrying value | 2,521 | 3,599
Financial assets, at fair value | 2,521 | 3,599
Fixed income securities and other |  |
Disclosure of financial assets [line items] |  |
Financial assets, carrying value | 3,241 | 2,270
Financial assets, at fair value | $ 3,241 | $ 2,270

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35H&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35I&doctype=Standard -URIDate 2021-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35M&doctype=Standard -URIDate 2021-03-24 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35N&doctype=Standard -URIDate 2021-03-24 + Details
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