Goodwill and Other Intangible Assets

The changes in the net carrying amount of goodwill for the six months ended June 30, 2018 are as follows (in millions):



Balance as of December 31, 2017	$	8,358
Goodwill related to current year acquisitions	31
Goodwill related to disposals	(1		)
Goodwill related to prior year acquisitions	10
Foreign currency translation and other	(107		)
Balance as of June 30, 2018	$	8,291

Other intangible assets by asset class are as follows (in millions):



	June 30, 2018						December 31, 2017
	Gross Carrying Amount		Accumulated Amortization and Impairment		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization and Impairment		Net Carrying Amount
Customer related and contract based	$	2,310	$	1,417	$	893	$	2,550	$	1,415	$	1,135
Tradenames	1,031		634		397		1,047		533		514
Technology and other	397		324		73		416		332		84
Total	$	3,738	$	2,375	$	1,363	$	4,013	$	2,280	$	1,733

In the second quarter of 2018, the Company reclassified $258 million of gross intangibles held for sale and $94 million of associated accumulated amortization to Other current assets. Refer to Note 7 “Acquisitions and Dispositions of Businesses” for further information.

In the second quarter of 2017 and in connection with the completion of the sale of the Divested Business, the Company recognized a non-cash impairment charge to the associated tradenames of $380 million. The fair value of the tradenames was determined using the Relief from Royalty Method. This impairment was included in Amortization and impairment of intangible assets on the Condensed Consolidated Statement of Income.

The estimated future amortization for finite lived intangible assets as of June 30, 2018 is as follows (in millions):



Remainder of 2018	$	205
2019	401
2020	228
2021	131
2022	85
Thereafter	313
Total	$	1,363