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Goodwill and Intangible Assets, Net (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The following table presents the changes in the carrying amounts of goodwill, by segment, for the year ended December 31, 2018. The 2017 goodwill impairment losses were reported as “Impairment losses” in the accompanying consolidated statements of operations. See Note 18, “Segments,” for a discussion of the change in our reportable segments in 2018.
 
Health Plans
 
Other
 
Total
 
(In millions)
Historical goodwill, gross
$
445

 
$
233

 
$
678

Accumulated impairment losses at December 31, 2017
(302
)
 
(190
)
 
(492
)
Balance, December 31, 2017
143

 
43

 
186

Sale of subsidiary
—

 
(43
)
 
(43
)
Balance, December 31, 2018
$
143

 
$
—

 
$
143

 
 
 
 
 
 
Accumulated impairment losses at December 31, 2018
$
302

 
$
190

 
$
492
Summary of identified intangible assets, by major class
The following table provides the details of identified intangible assets, by major class, for the periods indicated:
 
Cost
 
Accumulated
Amortization
 
Carrying Amount
 
(In millions)
Intangible assets:
 
 
 
 
 
Contract rights and licenses
$
201

 
$
162

 
$
39

Provider networks
20

 
12

 
8

Balance at December 31, 2018
$
221

 
$
174

 
$
47

Intangible assets:
 
 
 
 
 
Contract rights and licenses
$
201

 
$
141

 
$
60

Provider networks
20

 
11

 
9

Balance at December 31, 2017
$
221

 
$
152

 
$
69