GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)
 9 Months Ended
Sep. 30, 2016
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 nine months ended September 30, 2016 were as follows:
 
Retail
 
Group
 
Healthcare
Services
 
Total
 
(in millions)
Balance at January 1, 2016
$
1,069

 
$
385

 
$
1,811

 
$
3,265

Acquisitions
—

 
—

 
7

 
7

Balance at September 30, 2016
$
1,069

 
$
385

 
$
1,818

 
$
3,272
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 condensed consolidated balance sheets at September 30, 2016 and December 31, 2015.
 
 
 
September 30, 2016
 
December 31, 2015
 
Weighted
Average
Life
 
Cost
 
Accumulated
Amortization
 
Net
 
Cost
 
Accumulated
Amortization
 
Net
 
 
 
($ in millions)
Other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
Customer contracts/
relationships
9.8 yrs
 
$
566

 
$
333

 
$
233

 
$
566

 
$
292

 
$
274

Trade names and
technology
8.3 yrs
 
104

 
66

 
38

 
104

 
54

 
50

Provider contracts
14.5 yrs
 
51

 
28

 
23

 
51

 
24

 
27

Noncompetes and
other
8.2 yrs
 
32

 
28

 
4

 
32

 
26

 
6

Total other intangible
assets
9.8 yrs
 
$
753

 
$
455

 
$
298

 
$
753

 
$
396

 
$
357
Schedule of Estimated Amortization Expense
The following table presents our estimate of amortization expense for 2016 and each of the five next succeeding years:
 
(in millions)
For the years ending December 31,:
 
2016
$
77

2017
71

2018
63

2019
52

2020
48

2021
14