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Schedule II - Valuation and Qualifying Accounts (Details) - UAL and United - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Allowance for doubtful accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | $ 28 | $ 78 | $ 9
Additions Charged to Costs and Expenses | 22 | 3 | 70
Deductions | 39 | 53 | 16
Other | 0 | 0 | 15
Balance at End of Period | 11 | 28 | 78
Obsolescence allowance-spare parts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 546 | 478 | 425
Additions Charged to Costs and Expenses | 73 | 79 | 88
Deductions | 9 | 11 | 35
Other | 0 | 0 | 0
Balance at End of Period | 610 | 546 | 478
Allowance for credit losses - notes receivable |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 622 | 522 | 0
Additions Charged to Costs and Expenses | 20 | 1 | 518
Deductions | 539 | 0 | 0
Other | (82) | 99 | 4
Balance at End of Period | 21 | 622 | 522
Valuation allowance for deferred tax assets |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 210 | 247 | 58
Additions Charged to Costs and Expenses | (10) | (38) | 197
Deductions | 0 | 0 | 8
Other | (1) | 1 | 0
Balance at End of Period | $ 199 | $ 210 | $ 247

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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