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Basis of Presentation and Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2021
Accounting Policies [Abstract]  
Allowance for Doubtful Accounts
The rollforward of the allowance for doubtful accounts was as follows:
Year Ended December 31,
(In millions)202120202019
Beginning balance$18 $20 $11 
Provisions charged to expense13 
Write-offs, less recoveries, and other adjustments(9)(10)(4)
Ending balance$13 $18 $20 
Schedule of Property, Plant and Equipment
The estimated useful lives of property and equipment are described below:
Estimated Useful Life
Buildings
40 years
Leasehold improvementsShorter of useful life or term of lease
Technology and automated systems
3 to 15 years
Warehouse equipment and other
3 to 15 years
Computer, software and equipment
1 to 5 years
The following table summarizes property and equipment:
December 31,
(In millions)20212020
Land$$
Buildings and leasehold improvements326 273 
Warehouse equipment and other
832 700 
Computer, software and equipment (1)
550 499 
Technology and automated systems
276 214 
Total property and equipment, gross1,991 1,692 
Less: accumulated depreciation and amortization(1,128)(922)
Total property and equipment, net$863 $770 
(1) Includes internally developed software of $214 million and $198 million as of December 31, 2021 and 2020, respectively.