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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Allowance for credit losses | $ 30,000,000 | $ 9,000,000
Obsolescence allowance for aircraft fuel, spare parts and supplies | 446,000,000 | 425,000,000
Accumulated amortization on intangibles | 1,454,000,000 | $ 1,440,000,000
Allowance for credit losses on notes receivable | $ 549 |
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) | 247,256,855 | 251,216,381
United Airlines, Inc. |  |
Allowance for credit losses | $ 30,000,000 | $ 9,000,000
Obsolescence allowance for aircraft fuel, spare parts and supplies | 446,000,000 | 425,000,000
Accumulated amortization on intangibles | 1,454,000,000 | $ 1,440,000,000
Allowance for credit losses on notes receivable | $ 549,000,000 |
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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- Definition Amount of allowance for credit loss on accounts receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446 + Details
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