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INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets | $ 30,609 | $ 24,658
Infrastructure |  |
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets | 14,214 | 11,769
Intangible assets with indefinite useful life | 899 | 876
Private Equity |  |
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets | 14,806 | 11,261
Customer-related intangible assets [member] | Infrastructure |  |
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets | 2,500 | 0
Customer-related intangible assets [member] | Private Equity |  |
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets | $ 7,500 | 5,100
Useful Lives Or Amortisation Rates, Intangible Assets Other Than Goodwill, Period | 30 years |
Customer-related intangible assets [member] | North American Rail Operations [Member] | Infrastructure |  |
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets | $ 1,700 | 1,900
Customer-related intangible assets [member] | Residential infrastructure operation [Member] | Infrastructure |  |
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets | $ 1,300 | 1,400
Customer-related intangible assets [member] | Top of range | Private Equity |  |
Disclosure of detailed information about intangible assets [line items] |  |
Useful Lives Or Amortisation Rates, Intangible Assets Other Than Goodwill, Period | 23 years |
Copyrights, patents and other industrial property rights, service and operating rights [member] | Private Equity |  |
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets | $ 3,900 | 3,200
Useful Lives Or Amortisation Rates, Intangible Assets Other Than Goodwill, Period | 15 years |
Service concession arrangements [member] | Infrastructure |  |
Disclosure of detailed information about intangible assets [line items] |  |
Useful Lives Or Amortisation Rates, Intangible Assets Other Than Goodwill, Period | 31 years |
Service concession arrangements [member] | Private Equity |  |
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets | $ 1,800 | 1,800
Service concession arrangements [member] | Brazilian regulated gas transmission business [Member] | Infrastructure |  |
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets | 2,600 | 2,900
Service concession arrangements [member] | Indian Toll Road [Member] | Infrastructure |  |
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets | 1,600 | 2,600
Service concession arrangements [member] | Chilean electricity transmission operations | Infrastructure |  |
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets | $ 1,400 | 270
Useful Lives Or Amortisation Rates, Intangible Assets Other Than Goodwill, Period | 30 years |
Brand names [member] | Private Equity |  |
Disclosure of detailed information about intangible assets [line items] |  |
Intangible assets | $ 1,000 | $ 423
Useful Lives Or Amortisation Rates, Intangible Assets Other Than Goodwill, Period | 20 years |

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