GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Amount of Goodwill By Reportable Segments

Changes in the carrying amount of goodwill for our reportable segments for the years ended December 31, 2017 and 2016 were as follows:

	Retail		Group and Specialty		Healthcare Services		Total
	(in millions)
Balance at January 1, 2016	$	1,059	$	261	$	1,945	$	3,265
Acquisitions	—		—		7		7
Balance at December 31, 2016	1,059		261		1,952		3,272
Acquisitions	—		—		9		9
Balance at December 31, 2017	$	1,059	$	261	$	1,961	$	3,281

Details of Intangible Assets Included in Other Long-Term Assets

The following table presents details of our other intangible assets included in other long-term assets in the accompanying consolidated balance sheets at December 31, 2017 and 2016.

	Weighted Average Life	2017						2016
		Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
		(in millions)
Other intangible assets:
Customer contracts/relationships	9.8 years	$	566	$	401	$	165	$	566	$	347	$	219
Trade names and technology	8.2 years	104		84		20		104		69		35
Provider contracts	11.9 years	68		30		38		51		29		22
Noncompetes and other	8.1 years	32		29		3		32		28		4
Total other intangible assets	9.7 years	$	770	$	544	$	226	$	753	$	473	$	280

Schedule of Estimated Amortization Expense

The following table presents our estimate of amortization expense for each of the five next succeeding fiscal years:

	(in millions)
For the years ending December 31,
2018	$	64
2019	54
2020	52
2021	19
2022	16