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Goodwill and Intangibles (Tables)
 12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes in Carrying Amount of Goodwill
The carrying amount of goodwill was as follows:
 
 
Millions of Dollars
 
Midstream

 
Refining

 
Marketing and Specialties

 
Total

 
 
 
 
 
 
 
 
Balance at January 1, 2015
$
623

 
1,813

 
838

 
3,274

Goodwill assigned to acquisitions
—

 
—

 
1

 
1

Balance at December 31, 2015
623

 
1,813

 
839

 
3,275

Goodwill assigned to acquisitions
3

 
—

 
—

 
3

Goodwill allocated to dispositions
—

 
(8
)
 
—

 
(8
)
Balance at December 31, 2016
$
626

 
1,805

 
839

 
3,270
Schedule of Changes in Carrying Value of Intangible Assets
Information relating to the carrying value of intangible assets at December 31 follows:
 
 
Millions of Dollars
 
Gross Carrying
Amount
 
2016

 
2015

Indefinite-Lived Intangible Assets
 
 
 
Trade names and trademarks
$
503

 
503

Refinery air and operating permits
260

 
266

Other
1

 
1

 
$
764

 
770