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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule II - Valuation and Qualifying Accounts | SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS (in millions)
|  | Balance at beginning of period |  | Additions Charged to Costs and Expenses |  | Deductions |  | Balance at end of period
Year Ended December 31, 2020 |  |  |  |  |  |  |  |
Valuation allowance for deferred tax assets |  | $ | 31 |  |  | $ | 38 |  |  | $ | — |  |  | $ | 69 |
Allowance for obsolete inventory parts |  | 22 |  |  | 5 |  |  | — |  |  | 27 |
Allowance for doubtful accounts |  | 1 |  |  | 6 |  |  | 5 |  | (1) | 2 |
Total |  | $ | 54 |  |  | $ | 49 |  |  | $ | 5 |  |  | $ | 98 |
Year Ended December 31, 2019 |  |  |  |  |  |  |  |
Valuation allowance for deferred tax assets |  | $ | 21 |  |  | $ | 10 |  |  | $ | — |  |  | $ | 31 |
Allowance for obsolete inventory parts |  | 18 |  |  | 4 |  |  | — |  |  | 22 |
Allowance for doubtful accounts |  | 1 |  |  | 6 |  |  | 6 |  | (1) | 1 |
Total |  | $ | 40 |  |  | $ | 20 |  |  | $ | 6 |  |  | $ | 54 |
Year Ended December 31, 2018 |  |  |  |  |  |  |  |
Valuation allowance for deferred tax assets |  | $ | 1 |  |  | $ | 20 |  |  | $ | — |  |  | $ | 21 |
Allowance for obsolete inventory parts |  | 14 |  |  | 4 |  |  | — |  |  | 18 |
Allowance for doubtful accounts |  | 1 |  |  | 6 |  |  | 6 |  | (1) | 1 |
Total |  | $ | 16 |  |  | $ | 30 |  |  | $ | 6 |  |  | $ | 40 |
(1)Uncollectible accounts written off, net of recoveries.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 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) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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