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Goodwill and Other Intangibles (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016 and 2015:
Millions of dollars
2016
2015
North America
$
1,734

$
1,732

EMEA
808

832

Latin America
4

3

Asia
410

439

Total
$
2,956

$
3,006
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets
The following table summarizes other intangible assets at December 31, 2016 and 2015:
 
 
2016
 
2015
Millions of dollars
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net
Other intangible assets, finite lives:
 
 
 
 
 
 
 
 
 
 
 
 
Customer relationships (1)
 
$
617

 
$
(237
)
 
$
380

 
$
632

 
$
(200
)
 
$
432

Patents and other (2)
 
337

 
(150
)
 
187

 
359

 
(127
)
 
232

Total other intangible assets, finite lives
 
$
954

 
$
(387
)
 
$
567

 
$
991

 
$
(327
)
 
$
664

Trademarks, indefinite lives
 
1,985

 
—

 
1,985

 
2,014

 
—

 
2,014

Total other intangible assets
 
$
2,939

 
$
(387
)
 
$
2,552

 
$
3,005

 
$
(327
)
 
$
2,678

(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
 
2017
$
68

2018
65

2019
62

2020
62

2021
52