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Goodwill and Intangible Assets, Net
12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets, Net Goodwill and Intangible Assets, Net
Goodwill
The following table presents the changes in the carrying amounts of goodwill, for the periods presented. All goodwill is recorded in the Health Plans segment.
(In millions)
Balance, December 31, 2018
$143 
Acquisitions— 
Dispositions— 
Impairment and other— 
Balance, December 31, 2019
143 
Acquisitions549 
Dispositions— 
Impairment and other— 
Balance, December 31, 2020
$692 
For the Health Plans segment, gross goodwill amounted to $994 million and $445 million, as of December 31, 2020 and 2019, respectively. Accumulated impairment losses amounted to $302 million at each of December 31, 2020 and 2019, respectively. The changes in the carrying amounts of both goodwill and intangible assets, net, in 2020, was due to the acquisitions described in Note 4, “Business Combinations.”
Intangible Assets, Net
The following table provides the details of identified intangible assets, by major class, for the periods presented. All intangible assets, net, are recorded in the Health Plans segment.
December 31, 2020December 31, 2019
CostAccumulated
Amortization
Carrying Amount CostAccumulated
Amortization
Carrying Amount
 (In millions)
Contract rights and licenses$370 $168 $202 $179 $156 $23 
Provider networks47 15 32 20 14 
Trade name 15 — 15 — — — 
Total$432 $183 $249 $199 $170 $29 
As of December 31, 2020, we estimate that our intangible asset amortization will be approximately $46 million in 2021, $44 million in 2022, 2023 and 2024, and $43 million in 2025.