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GOVERNMENT GRANTS AND RESTRUCTURING (Tables)
 12 Months Ended
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)202220212020
Fleet retirements$(48)$40 $4,409 
Voluntary programs and other employee benefit charges(79)(17)3,409 
Receivables and other3 (42)401 
Total restructuring charges$(124)$(19)$8,219