GOODWILL AND OTHER INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL AND OTHER INTANGIBLE ASSETS
Changes in the carrying amount of goodwill for our reportable segments for the years ended December 31, 2019 and 2018 were as follows:
 
 
Retail
 
Group and Specialty
 
Healthcare Services
 
Total
 
 
(in millions)
Balance at January 1, 2018
 
$
1,059

 
$
261

 
$
1,961

 
$
3,281

Acquisitions
 
476

 
—

 
140

 
616

Balance at December 31, 2018
 
1,535

 
261

 
2,101

 
3,897

Acquisitions
 
—

 
—

 
31

 
31

Balance at December 31, 2019
 
$
1,535

 
$
261

 
$
2,132

 
$
3,928


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, 2019 and 2018.
 
 
Weighted
Average
Life
 
2019
 
2018
 
 
Cost
 
Accumulated
Amortization
 
Net
 
Cost
 
Accumulated
Amortization
 
Net
 
 
 
 
(in millions)
Other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Customer contracts/relationships
 
8.7 years
 
$
646

 
$
496

 
$
150

 
$
646

 
$
434

 
$
212

Trade names and technology
 
6.4 years
 
84

 
84

 
—

 
84

 
83

 
1

Provider contracts
 
11.8 years
 
70

 
44

 
26

 
68

 
37

 
31

Noncompetes and other
 
7.3 years
 
29

 
28

 
1

 
29

 
28

 
1

Total other intangible assets
 
8.7 years
 
$
829

 
$
652

 
$
177

 
$
827

 
$
582

 
$
245


Amortization expense for other intangible assets was approximately $70 million in 2019, $90 million in 2018, and $75 million in 2017. Amortization expense for 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 for each of the five next succeeding fiscal years:
 
(in millions)
For the years ending December 31,
 
2020
$
68

2021
34

2022
31

2023
18

2024
11