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Goodwill and Other Intangibles (Tables)
 12 Months Ended
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived and Indefinite-Lived Intangible Assets
The following table summarizes other intangible assets at December 31, 2013 and 2012:
 
 
2013
 
2012
Millions of dollars
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net
Other intangible assets, finite lives:
 
 
 
 
 
 
 
 
 
 
 
 
Customer relationships (1)
 
$
289

 
$
(125
)
 
$
164

 
$
289

 
$
(109
)
 
$
180

Patents and other (2)
 
128

 
(112
)
 
16

 
123

 
(102
)
 
21

Total other intangible assets, finite lives
 
$
417

 
$
(237
)
 
$
180

 
$
412

 
$
(211
)
 
$
201

Trademarks, indefinite lives
 
1,522

 
—

 
1,522

 
1,521

 
—

 
1,521

Total other intangible assets
 
$
1,939

 
$
(237
)
 
$
1,702

 
$
1,933

 
$
(211
)
 
$
1,722

(1) 
Customer relationships have an estimated useful life of 18 years. 
(2)    Patents and other intangibles have an estimated useful life of 4
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
The following table summarizes our future estimated amortization expense by year:
Millions of dollars
 
2014
$
22

2015
20

2016
18

2017
17

2018
17