Goodwill and Other Intangible Assets and Liabilities

During the years ended December 31, 2013, 2012 and 2011, no impairment losses related to goodwill were incurred. As of December 31, 2013 and 2012, there were no accumulated impairment losses related to goodwill.

The changes in the carrying amount of goodwill were as follows (in millions):



	December 31, 2013		December 31, 2012			December 31, 2012
			(As Adjusted)			(As Reported)
Beginning balance	$	14,819	$	14,803		$	14,803
Additions	—		33			33
Acquisition valuation	—		(17		)	—
Ending balance	$	14,819	$	14,819		$	14,836

In December 2012, BNSF Logistics, LLC, made an immaterial acquisition of two companies. During the fourth quarter of 2013, the Company completed the acquisition valuation which resulted in a reduction of the December 31, 2012 goodwill carrying value. The reduction to goodwill was offset by an increase of $14 million and $1 million to the provisional values of intangible assets and other current assets, respectively, and a decrease of $2 million to the provisional values of accounts payable and other current liabilities.

Intangible assets and liabilities were as follows (in millions):



	As of December 31, 2013				As of December 31, 2012
	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Intangible assets	$	2,030	$	1,209	$	2,027	$	899
Intangible liabilities	$	2,056	$	1,095	$	2,056	$	842

Intangible assets primarily consisted of internally developed software and franchise and customer assets. Intangible liabilities primarily consisted of customer and shortline contracts which were in an unfavorable position at the date of Merger.

Amortizable intangible assets and liabilities are amortized based on the estimated pattern in which the economic benefits are expected to be consumed or on a straight-line basis over their estimated economic lives.

Amortization of intangible assets and liabilities was as follows (in millions):



	December 31, 2013		December 31, 2012
Amortization of intangible assets	$	310	$	306
Amortization of intangible liabilities	$	253	$	282

Amortization of intangible assets and liabilities for the next five years is expected to approximate the following (in millions):



	Amortization of intangible assets		Amortization of intangible liabilities
2014	$	310	$	179
2015	$	56	$	115
2016	$	33	$	101
2017	$	33	$	96
2018	$	31	$	90