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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2023
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, 2023 |  |  |  |  |  |  |  |
Valuation allowance for deferred tax assets |  | $ | 90 |  |  | $ | 69 |  |  | $ | 6 |  |  | $ | 153 |
Allowance for obsolete inventory parts |  | 29 |  |  | 6 |  |  | — |  |  | 35 |
Allowance for doubtful accounts |  | 4 |  |  | 19 |  |  | 20 |  | (1) | 3 |
Total |  | $ | 123 |  |  | $ | 94 |  |  | $ | 26 |  |  | $ | 191 |
Year Ended December 31, 2022 |  |  |  |  |  |  |  |
Valuation allowance for deferred tax assets |  | $ | 73 |  |  | $ | 30 |  |  | $ | 13 |  |  | $ | 90 |
Allowance for obsolete inventory parts |  | 24 |  |  | 5 |  |  | — |  |  | 29 |
Allowance for doubtful accounts |  | 3 |  |  | 16 |  |  | 15 |  | (1) | 4 |
Total |  | $ | 100 |  |  | $ | 51 |  |  | $ | 28 |  |  | $ | 123 |
Year Ended December 31, 2021 |  |  |  |  |  |  |  |
Valuation allowance for deferred tax assets |  | $ | 69 |  |  | $ | 19 |  |  | $ | 15 |  |  | $ | 73 |
Allowance for obsolete inventory parts |  | 27 |  |  | 4 |  |  | 7 |  |  | 24 |
Allowance for doubtful accounts |  | 2 |  |  | 14 |  |  | 13 |  | (1) | 3 |
Total |  | $ | 98 |  |  | $ | 37 |  |  | $ | 35 |  |  | $ | 100 |
(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 -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-4 + Details
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- References No definition available. + Details
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