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GOODWILL AND OTHER INTANGIBLE ASSETS Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Amortization expense, intangible assets		$ 78	$ 92	$ 89
GOODWILL		429	424	544
Impairment of goodwill, intangible and other assets		123	156	28
Other businesses
Segment Reporting Information [Line Items]
Goodwill, Impairment Loss, Rounded			105
Impairment of Intangible Assets (Excluding Goodwill)		120
Impairment of goodwill, intangible and other assets	$ 139
Canada
Segment Reporting Information [Line Items]
GOODWILL		$ 126	$ 120	$ 130

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- Definition

Goodwill, Impairment Loss, Rounded

+ References

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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.

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-Publisher FASB
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-Section 45
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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.

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Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

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