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Goodwill and Other Intangibles (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill by Operating Segment
The following table summarizes goodwill attributable to our reporting units at December 31, 2017 and 2016:
Millions of dollars
2017
2016
North America
$
1,755

$
1,734

EMEA
920

808

Latin America
5

4

Asia
438

410

Total
$
3,118

$
2,956
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets
The following table summarizes other intangible assets at December 31, 2017 and 2016:
 
 
2017
 
2016
Millions of dollars
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net
Other intangible assets, finite lives:
 
 
 
 
 
 
 
 
 
 
 
 
Customer relationships (1)
 
$
639

 
$
(297
)
 
$
342

 
$
617

 
$
(237
)
 
$
380

Patents and other (2)
 
387

 
(179
)
 
208

 
337

 
(150
)
 
187

Total other intangible assets, finite lives
 
$
1,026

 
$
(476
)
 
$
550

 
$
954

 
$
(387
)
 
$
567

Trademarks, indefinite lives
 
2,041

 
—

 
2,041

 
1,985

 
—

 
1,985

Total other intangible assets
 
$
3,067

 
$
(476
)
 
$
2,591

 
$
2,939

 
$
(387
)
 
$
2,552

(1) Customer relationships have an estimated useful life of 3 to 16 years. 
(2) Patents and other intangibles have an estimated useful life of 1 to 41 years.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
The following table summarizes our future estimated amortization expense by year:
Millions of dollars
 
2018
$
74

2019
61

2020
61

2021
58

2022
51