	December 28,			December 29,
(In millions)	2019			2018
Land	$	45		$	53
Buildings		221			281
Computer software		653			588
Leasehold improvements		658			649
Furniture, fixtures and equipment		833			787
Construction in progress		49			70
		2,459			2,428
Less accumulated depreciation		(1,780	)		(1,665	)
Total	$	679		$	763

The above table of property and equipment includes assets held under finance leases as follows:

	December 28,			December 29,
(In millions)	2019			2018
Buildings	$	40		$	42
Furniture, fixtures and equipment		132			100
		172			142
Less accumulated depreciation		(120	)		(108	)
Total	$	52		$	34

Depreciation expense was $118 million in 2019, $114 million in 2018 and $111 million in 2017.

Included in computer software and construction in progress above are capitalized software costs of $653 million and $589 million at December 28, 2019 and December 29, 2018, respectively. The unamortized amounts of the capitalized software costs are $134 million and $118 million at December 28, 2019 and December 29, 2018, respectively. Amortization of capitalized software costs totaled $55 million, $46 million and $39 million in 2019, 2018 and 2017, respectively. Software development costs that do not meet the criteria for capitalization are expensed as incurred.

Estimated future amortization expense related to capitalized software at December 28, 2019 is as follows:

(In millions)
2020	$	50
2021		39
2022		24
2023		14
2024		5
Thereafter		2

The weighted average remaining amortization period for capitalized software is 3 years.

Certain facilities that were part of continuing operations but had been identified for closure through integration and other activities were accounted for as assets held for sale. Assets held for sale primarily consists of supply chain facilities and are presented in Prepaid expenses and other current assets in the Consolidated Balance Sheets. The Company recognized $25 million gain on disposition of

assets held for sale during 2019, of which $19 million was included in Selling, general and administrative expenses and $6 million was included in Merger and restructuring expenses, net in the Consolidated Statement of Operations. The assets held for sale activity in 2019 is presented in the table below.

(In millions)
Balance as of December 29, 2018	$	6
Additions		18
Dispositions		(24	)
Balance as of December 28, 2019	$	—