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Schedule II Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2017
Schedule II Valuation and Qualifying Accounts | Schedule II Valuation and Qualifying Accounts For the Years Ended December 31, 2017, 2016 and 2015
(In millions) Description |  | Balance at Beginning of Period |  |  | Additions Charged to Costs and Expenses |  |  | Deductions (a) |  |  | Other |  |  | Balance at End of Period |
Allowance for doubtful accounts—UAL and United: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 |  | $ | 10 |  |  | $ | 20 |  |  | $ | 23 |  |  | $ | — |  |  | $ | 7 |
2016 |  |  | 18 |  |  |  | 18 |  |  |  | 26 |  |  |  | — |  |  |  | 10 |
2015 |  |  | 22 |  |  |  | 25 |  |  |  | 29 |  |  |  | — |  |  |  | 18 |
Obsolescence allowance—spare parts—UAL and United: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 |  | $ | 295 |  |  | $ | 75 |  |  | $ | 17 |  |  | $ | 1 |  |  | $ | 354 |
2016 |  |  | 235 |  |  |  | 61 |  |  |  | 16 |  |  |  | 15 |  |  |  | 295 |
2015 |  |  | 169 |  |  |  | 38 |  |  |  | — |  |  |  | 28 |  |  |  | 235 |
Valuation allowance for deferred tax assets—UAL: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 |  | $ | 68 |  |  | $ | 11 |  |  | $ | 27 |  |  | $ | 11 |  |  | $ | 63 |
2016 |  |  | 48 |  |  |  | 47 |  |  |  | 27 |  |  |  | — |  |  |  | 68 |
2015 |  |  | 4,751 |  |  |  | — |  |  |  | 4,703 |  |  |  | — |  |  |  | 48 |
Valuation allowance for deferred tax assets—United: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 |  | $ | 68 |  |  | $ | 11 |  |  | $ | 27 |  |  | $ | 11 |  |  | $ | 63 |
2016 |  |  | 48 |  |  |  | 47 |  |  |  | 27 |  |  |  | — |  |  |  | 68 |
2015 |  |  | 4,721 |  |  |  | — |  |  |  | 4,673 |  |  |  | — |  |  |  | 48 |
(a) Deduction from reserve for purpose for which reserve was created.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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