GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2019

GOODWILL AND OTHER INTANGIBLES [Abstract]

Schedule of Goodwill

The balances and changes in the carrying amount of Goodwill by segment are as follows (in millions of dollars):

	United States		Canada			Other businesses			Total
Balance at January 1, 2018	$	192	$	130		$	222		$	544
Impairment	—		—			(105		)	(105		)
Translation	—		(10		)	(5		)	(15		)
Balance at December 31, 2018	192		120			112			424
Translation	—		6			(1		)	5
Balance at December 31, 2019	$	192	$	126		$	111		$	429

	United States		Canada		Other businesses		Total
Cumulative goodwill impairment charges, December 31, 2019 (1)	$	—	$	32	$	152	$	184

(1) Restated to include only impairments related to current businesses in Grainger's portfolio.

Schedule of Finite-Lived Intangible Assets by Major Class

The balances and changes in Intangible assets - net are as follows (in millions of dollars):

		As of December 31,
		2019						2018
	Weighted average life	Gross carrying amount		Accumulated amortization/ impairment		Net carrying amount		Gross carrying amount		Accumulated amortization/impairment		Net carrying amount
Customer lists and relationships	13.2 years	$	401	$	301	$	100	$	410	$	204	$	206
Trademarks, trade names and other	14.1 years	36		20		16		24		15		9
Non-amortized trade names and other	—	100		38		62		133		34		99
Capitalized software	4.2 years	626		500		126		657		511		146
Total intangible assets	8.2 years	$	1,163	$	859	$	304	$	1,224	$	764	$	460

Schedule of Estimated Amortization Expense

Estimated amortization expense for future periods is as follows (in millions of dollars):

Year	Expense
2020	$	72
2021	55
2022	38
2023	13
2024	12
Thereafter	52
Total	$	242