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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Current Assets:
Allowance for uncollectible accounts	$ 18	$ 17
Allowance for obsolescence	120	123
Noncurrent Assets:
Accumulated depreciation and amortization	23,228	21,707
Accumulated amortization	$ 919	$ 911
Stockholders' Equity:
Common stock, par value (USD per share)	$ 0.0001	$ 0.0001
Common stock, authorized (shares)	1,500,000,000	1,500,000,000
Common stock, issued (shares)	654,571,606	654,671,194
Treasury stock, at cost (shares)	8,098,971	11,224,246

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The amount of the valuation account as of the balance sheet date which reduces the carrying amount of airline related inventory (including expendable merchandise, goods, commodities, or supplies to be used primarily in air transport of passengers or freight) to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage.

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