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GOODWILL - Cash Generating Units Table (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Intangible assets | $ 2,687 | $ 2,948 |
Goodwill |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Goodwill | 489 | 528 | $ 667
U.K. regulated distribution operation | Goodwill |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Goodwill | 33 | 38 |
Brazilian regulated gas transmission operation | Goodwill |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Goodwill | $ 456 | $ 490 |

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