Goodwill and Other Intangible Assets

The changes in the net carrying amount of goodwill for the nine months ended September 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	(3		)
Goodwill related to prior year acquisitions	13
Foreign currency translation and other	(117		)
Balance as of September 30, 2018	$	8,282

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



	September 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	$	2,305	$	1,457	$	848	$	2,550	$	1,415	$	1,135
Tradenames	1,030		687		343		1,047		533		514
Technology and other	396		327		69		416		332		84
Total	$	3,731	$	2,471	$	1,260	$	4,013	$	2,280	$	1,733

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 September 30, 2018 is as follows (in millions):



Remainder of 2018	$	100
2019	386
2020	222
2021	128
2022	85
Thereafter	339
Total	$	1,260