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GOODWILL AND OTHER INTANGIBLE ASSETS - Gross Amount and Accumulated Impairment Losses of Goodwill (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Impairments |  |
Goodwill | $ 4,769 | $ 4,769
Cost |  |
Impairments |  |
Goodwill | 12,211 |
Accumulated impairment losses |  |
Impairments |  |
Goodwill | $ (7,442) |

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