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GOODWILL AND OTHER INTANGIBLE ASSETS Balances and Changes in Carrying Amounts of Goodwill (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 429	$ 429	$ 424
Acquisition		15
Impairment		(58)
Translation		5	5
Goodwill, ending balance		391	429
Other businesses
Goodwill [Roll Forward]
Goodwill, beginning balance	111	111	112
Acquisition		15
Impairment	(58)	(58)
Translation		2	(1)
Goodwill, ending balance		70	111
United States
Goodwill [Roll Forward]
Goodwill, beginning balance	192	192	192
Acquisition		0
Impairment		0
Translation		0	0
Goodwill, ending balance		192	192
Canada
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 126	126	120
Acquisition		0
Impairment		0
Translation		3	6
Goodwill, ending balance		$ 129	$ 126

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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