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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2024
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule II - Valuation and Qualifying Accounts | Schedule II - Valuation and Qualifying Accounts The table below details the activity of the allowance for doubtful accounts, deferred tax asset valuation allowance, and insurance reserves (in millions):
|  | Balance at Beginning of Period |  | Additions (1), (2) |  | Deductions (2) |  | Other (4) |  | Balance at End of Period
Year Ended December 31, 2022 |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 51 |  |  | $ | 286 |  |  | $ | (257) |  |  | $ | — |  |  | $ | 80 |
Deferred tax asset valuation allowance |  | $ | 13,920 |  |  | $ | 2,204 |  |  | $ | (2,153) |  |  | $ | — |  |  | $ | 13,971 |
Insurance reserves (4) |  | $ | 4,028 |  |  | $ | 2,128 |  |  | $ | (1,396) |  |  | $ | (6) |  |  | $ | 4,754 |
Year Ended December 31, 2023 |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 80 |  |  | $ | 245 |  |  | $ | (234) |  |  | $ | — |  |  | $ | 91 |
Deferred tax assets valuation allowance |  | $ | 13,971 |  |  | $ | 81 |  |  | $ | (107) |  |  | $ | — |  |  | $ | 13,945 |
Insurance reserves (3), (4) |  | $ | 4,754 |  |  | $ | 3,544 |  |  | $ | (1,526) |  |  | $ | 214 |  |  | $ | 6,986 |
Year Ended December 31, 2024 |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 91 |  |  | $ | 252 |  |  | $ | (248) |  |  | $ | — |  |  | $ | 95 |
Deferred tax assets valuation allowance |  | $ | 13,945 |  |  | $ | 241 |  |  | $ | (7,919) |  |  | $ | — |  |  | $ | 6,267 |
Insurance reserves (3), (4) |  | $ | 6,986 |  |  | $ | 4,489 |  |  | $ | (1,696) |  |  | $ | 17 |  |  | $ | 9,796 |
(1) Additions to insurance reserves include $152 million, $158 million and $(78) million for the years ended December 31, 2022, 2023 and 2024 respectively, for changes in estimates resulting from new developments in prior period claims. (2) For the year ended December 31, 2022, the increase in the valuation allowance was primarily attributable to an increase in deferred tax assets resulting from the loss from operations, offset by the deferred tax impact from the transfer of certain intangible assets among our wholly-owned subsidiaries. For the year ended December 31, 2024, the decrease in the valuation allowance was primarily attributable to the release of the valuation allowance of certain U.S. federal and state deferred tax assets. (3) $248 million and $264 million of the insurance reserve is covered by third-party insurance and is included as a component of prepaid expenses and other current assets and other assets as of December 31, 2023 and 2024, respectively. (4) Other represents the change in the insurance reserve for which there is a corresponding insurance recoverable.

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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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