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Property, Equipment, and Capitalized Software, Net - Summary of Property, Equipment, and Capitalized Software (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Total cost | $ 752 | $ 687
Less: accumulated amortization - capitalized software | (385) | (351)
Less: accumulated depreciation and amortization - furniture, equipment, building, and improvements | (192) | (179)
Total accumulated depreciation and amortization | (577) | (530)
ROU assets - finance leases | 216 | 228
Property, equipment, and capitalized software, net | 391 | 385
Capitalized software |  |
Property, Plant and Equipment [Line Items] |  |
Total cost | 475 | 421
Furniture and equipment |  |
Property, Plant and Equipment [Line Items] |  |
Total cost | 221 | 213
Building and improvements |  |
Property, Plant and Equipment [Line Items] |  |
Total cost | 49 | 49
Land |  |
Property, Plant and Equipment [Line Items] |  |
Total cost | 4 | 4
Magellan Complete Care |  |
Property, Plant and Equipment [Line Items] |  |
Total cost | $ 3 | $ 0

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