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GOVERNMENT GRANTS AND RESTRUCTURING (Tables) | 12 Months Ended
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Dec. 31, 2022
Restructuring and Related Activities [Abstract] |
Schedule of restructuring charges by category | During 2020, we implemented enhanced measures focusing on the safety of our customers and employees, while at the same time seeking to mitigate the impact on our financial position and operations and to position our business for recovery through actions including fleet retirements, offering voluntary retirement and separation programs and other decisions. These actions resulted in significant restructuring charges during the year ended December 31, 2020. Subsequent to these charges, we recorded adjustments to certain of these restructuring charges during the years ended December 31, 2022 and 2021, representing changes in our estimates or the outcome of contract negotiations. These charges and adjustments are summarized as follows:
Restructuring charges by category |  |  |
| Year Ended December 31,
(in millions) | 2022 | 2021 | 2020
Fleet retirements | $ | (48) |  | $ | 40 |  | $ | 4,409 |
Voluntary programs and other employee benefit charges | (79) |  | (17) |  | 3,409 |
Receivables and other | 3 |  | (42) |  | 401 |
Total restructuring charges | $ | (124) |  | $ | (19) |  | $ | 8,219 |

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- Definition Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI https://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4) -URI https://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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