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Property, Plant, and Capitalized Software (Notes)
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment Disclosure [Text Block] Property, Equipment and Capitalized Software
A summary of property, equipment and capitalized software is as follows:
(in millions)December 31, 2020December 31, 2019
Land and improvements$533 $589 
Buildings and improvements4,759 4,705 
Computer equipment1,767 2,015 
Furniture and fixtures1,787 1,752 
Less accumulated depreciation(3,364)(3,328)
Property and equipment, net5,482 5,733 
Capitalized software5,010 4,638 
Less accumulated amortization(1,866)(1,667)
Capitalized software, net3,144 2,971 
Total property, equipment and capitalized software, net$8,626 $8,704 
 Depreciation expense for property and equipment for the years ended December 31, 2020, 2019 and 2018 was $997 million, $995 million and $924 million, respectively. Amortization expense for capitalized software for the years ended December 31, 2020, 2019 and 2018 was $814 million, $721 million and $606 million, respectively.