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Property, Equipment, and Capitalized Software, Net - Summary of Property, Equipment, and Capitalized Software (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Total cost $ 822 $ 752
Less: accumulated amortization - capitalized software (427) (385)
Less: accumulated depreciation and amortization - furniture, equipment, building, and improvements (205) (192)
Total accumulated depreciation and amortization (632) (577)
ROU assets - finance leases 206 216
Property, equipment, and capitalized software, net 396 391
Capitalized software    
Property, Plant and Equipment [Line Items]    
Total cost 547 475
Furniture and equipment    
Property, Plant and Equipment [Line Items]    
Total cost 237 221
Building and improvements    
Property, Plant and Equipment [Line Items]    
Total cost 37 49
Land    
Property, Plant and Equipment [Line Items]    
Total cost 1 4
Magellan Complete Care acquisition opening balance    
Property, Plant and Equipment [Line Items]    
Total cost $ 0 $ 3