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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Receivables, allowance for doubtful accounts | $ 28 | $ 78
Aircraft fuel, spare parts and supplies, obsolescence allowance | 546 | 478
Intangibles, accumulated amortization | 1,544 | 1,495
Allowance for credit losses on notes receivable | $ 622 | $ 522
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common shares, authorized (in shares) | 1,000,000,000 | 1,000,000,000
Common shares, outstanding (in shares) | 323,810,825 | 311,845,232
United Airlines, Inc. |  |
Receivables, allowance for doubtful accounts | $ 28 | $ 78
Aircraft fuel, spare parts and supplies, obsolescence allowance | 546 | 478
Intangibles, accumulated amortization | 1,544 | 1,495
Allowance for credit losses on notes receivable | $ 622 | $ 522
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common shares, authorized (in shares) | 1,000 | 1,000
Common shares, issued (in shares) | 1,000 | 1,000
Common shares, outstanding (in shares) | 1,000 | 1,000

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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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