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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Current Assets: |  |
Allowance for uncollectible accounts | $ 17 | $ 23
Allowance for obsolescence | 128 | 136
Noncurrent Assets: |  |
Accumulated depreciation and amortization | 21,235 | 20,370
Accumulated amortization | $ 909 | $ 902
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) | 654,674,447 | 651,800,786
Treasury stock, at cost (shares) | 11,211,014 | 10,535,033

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- Definition 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. + References No definition available. + Details
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