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Restructuring Costs (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) employee | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | $ 49 |  |
Positions eliminated | employee | 475 |  |
Percent of positions eliminated | 8.00% |  |
Severance costs | $ 34 | $ 6 |
Impairment loss | 12 | 16 | $ 18
Accrued restructuring expense | 3 |  | 6
Wrote off of fixed assets | 14 | 48 |
Disposal of property and equipment | $ 289 |  |
Restructuring costs and asset impairment charge |  | 70 | 25
Write-off of leasehold improvements |  |  | $ 1
Furniture, fixtures, equipment and other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Wrote off of fixed assets |  | 5 |
Capitalized software and hardware |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Disposal of property and equipment |  | $ 43 |

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- Definition The adjustment to reduce the value of existing agreements that specify the lessee's rights to use the leased property. This expense is charged when the estimates of future profits generated by the leased property are reduced. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482130/360-10-45-4 + Details
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