Goodwill and Other Intangibles (Tables)

12 Months Ended

Dec. 31, 2014

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, 2014 and 2013:

	2014							2013
Millions of dollars	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Other intangible assets, finite lives:
Customer relationships (1)	$	665	$	(163	)	$	502	$	289	$	(125	)	$	164
Patents and other (2)	348		(104		)	244		128		(112		)	16
Total other intangible assets, finite lives	$	1,013	$	(267	)	$	746	$	417	$	(237	)	$	180
Trademarks, indefinite lives	2,057		—			2,057		1,522		—			1,522
Total other intangible assets	$	3,070	$	(267	)	$	2,803	$	1,939	$	(237	)	$	1,702

^{(1)    Customer relationships have an estimated useful life of 4 to 19 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
2015	$	78
2016	75
2017	72
2018	70
2019	67