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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 The tables below detail the activity of the customer receivable reserve, insurance liability, and the valuation allowance on deferred tax assets for the years ended December 31, 2021, 2022 and 2023 (in millions):
| Balance at Beginning of Year | Charged to Expenses | Charges Utilized/ Write-Offs | Balance at End of Year
Customer Receivable Reserve |  |  |  |
Year Ended December 31, 2021 | $ | 91 |  | $ | 27 |  | $ | (87) |  | $ | 31 |
Year Ended December 31, 2022 | $ | 31 |  | $ | 49 |  | $ | (41) |  | $ | 39 |
Year Ended December 31, 2023 | $ | 39 |  | $ | 61 |  | $ | (56) |  | $ | 44 |
| Balance at Beginning of Year | Additions for Current Period | Changes in Estimates for Prior Periods | Net Payments | Balance at End of Year
Insurance Liability |  |  |  |  |
Year Ended December 31, 2021 | $ | 51 |  | $ | 85 |  | $ | 1 |  | $ | (90) |  | $ | 47 |
Year Ended December 31, 2022 | $ | 47 |  | $ | 140 |  | $ | (5) |  | $ | (121) |  | $ | 61 |
Year Ended December 31, 2023 | $ | 61 |  | $ | 206 |  | $ | 2 |  | $ | (185) |  | $ | 84 |
| Balance at Beginning of Year | Charged to Expenses | Credited to Expenses | Balance at End of Year
Valuation Allowance on Deferred Tax Assets |  |  |  |
Year Ended December 31, 2021 | $ | 2,053 |  | $ | 1,211 |  | $ | — |  | $ | 3,264 |
Year Ended December 31, 2022 | $ | 3,264 |  | $ | — |  | $ | (98) |  | $ | 3,166 |
Year Ended December 31, 2023 | $ | 3,166 |  | $ | 95 |  | $ | (2,897) |  | $ | 364 |

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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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