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GOODWILL AND OTHER INTANGIBLE ASSETS Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Goodwill, Impairment Loss |  | $ 58 |  |
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount |  | 25.00% |  |
Reporting Unit, Change In Percentage of Fair Value in Excess of Carrying Amount |  | 0.10 |  |
Impairment of goodwill, intangibles and long lived assets |  | $ 187 | $ 123 | $ 156
Goodwill, Impaired, Accumulated Impairment Loss |  | 137 |  |
Amortization expense, intangible assets |  | 60 | 78 | $ 92
Other businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Goodwill, Impairment Loss | $ 58 | 58 |  |
Impairment of goodwill, intangibles and long lived assets | 133 |  |  |
Impairment of Intangible Assets (Excluding Goodwill) | $ 75 |  | 120 |
Goodwill, Impaired, Accumulated Impairment Loss |  | 105 |  |
Goodwill, Impairment Loss, Rounded |  |  | $ 105 |
Canada |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Goodwill, Impairment Loss |  | 0 |  |
Goodwill, Impaired, Accumulated Impairment Loss |  | $ 32 |  |
Pro Forma |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Reporting Unit, Impairment Trigger, Pre-Tax Discount Rate |  | 0.03 |  |
Reporting Unit, Impairment Trigger, Decrease In Revenue Long-Term Growth Rate |  | 0.015 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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