GOODWILL AND OTHER INTANGIBLE ASSETS

6 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the carrying amount of goodwill for our reportable segments for the six months ended June 30, 2019 were as follows:



	Retail		Group and Specialty		Healthcare Services		Total
	(in millions)
Balance at January 1, 2019	$	1,535	$	261	$	2,101	$	3,897
Acquisitions	—		—		25		25
Balance at June 30, 2019	$	1,535	$	261	$	2,126	$	3,922

The following table presents details of our other intangible assets included in other long-term assets in the accompanying condensed consolidated balance sheets at June 30, 2019 and December 31, 2018.



		June 30, 2019						December 31, 2018
	Weighted Average Life	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
		($ in millions)
Other intangible assets:
Customer contracts/ relationships	8.7 years	$	647	$	465	$	182	$	646	$	434	$	212
Trade names and technology	6.4 years	84		84		—		84		83		1
Provider contracts	11.8 years	69		41		28		68		37		31
Noncompetes and other	7.3 years	29		28		1		29		28		1
Total other intangible assets	8.7 years	$	829	$	618	$	211	$	827	$	582	$	245

Amortization expense for other intangible assets was approximately $18 million for the three months ended June 30, 2019 and $21 million for the three months ended June 30, 2018. For the six months ended June 30, 2019 and 2018, amortization expense for other intangible assets was approximately $36 million and $51 million, respectively. Amortization expense for the six months ended June 30, 2018 included $12 million associated with the write-off of a trade name value reflecting the re-branding of certain provider assets. The following table presents our estimate of amortization expense remaining for 2019 and each of the five next succeeding years:



	(in millions)
For the years ending December 31,
2019	$	34
2020	67
2021	34
2022	31
2023	18
2024	11