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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2017

$
202


$
122


$
203


$
527

Divestiture
 
(3
)
 
—

 
—

 
(3
)
Impairment
 
(7
)
 
—

 
—

 
(7
)
Translation
 
—

 
8

 
19

 
27

Balance at December 31, 2017
 
192

 
130

 
222

 
544

Impairment
 
—

 
—

 
(105
)
 
(105
)
Translation
 
—

 
(10
)
 
(5
)
 
(15
)
Balance at December 31, 2018
 
$
192

 
$
120

 
$
112

 
$
424


Cumulative goodwill impairment charges, January 1, 2018
 
$
24

 
$
32

 
$
71

 
$
127

Impairment
 
—

 
—

 
105

 
105

Cumulative goodwill impairment charges, December 31, 2018
 
$
24

 
$
32

 
$
176

 
$
232
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,
 
 
 
2018
 
2017
 
Weighted average life
 
Gross carrying amount
 
Accumulated amortization
 
Net carrying amount
 
Gross carrying amount
 
Accumulated amortization
 
Net carrying amount
Customer lists and relationships
14.3 years
 
$
410

 
$
204

 
$
206

 
$
430

 
$
196

 
$
234

Trademarks, trade names and other
14.5 years
 
24

 
15

 
9

 
26

 
16

 
10

Non-amortized trade names and other
 
 
99

 
—

 
99

 
137

 
—

 
137

Capitalized software
4.2 years
 
657

 
511

 
146

 
633

 
445

 
188

Total intangible assets
8.2 years
 
$
1,190

 
$
730

 
$
460

 
$
1,226

 
$
657

 
$
569
Schedule of Estimated Amortization Expense
Estimated amortization expense for future periods is as follows (in millions of dollars):
Year
 
Expense
2019
 
$
84
 
2020
 
66
 
2021
 
50
 
2022
 
26
 
2023
 
20
 
Thereafter
 
115