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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