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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]  
Valuation and Qualifying Accounts Valuation and Qualifying Accounts (in millions)
Balance at Beginning of YearAdditions Charged to Statement of Operations AccountsDeductionsBalance at
End of Year
Allowance for obsolescence of spare parts
Year ended December 31, 2021$490 $177 $(33)$634 
Year ended December 31, 2020784 100 (394)490 
Year ended December 31, 2019814 91 (121)784 
Allowance for credit losses on accounts receivable
Year ended December 31, 2021$36 $22 $(24)$34 
Year ended December 31, 202031 27 (22)36 
Year ended December 31, 201929 19 (17)31 
American Airlines, Inc.  
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]  
Valuation and Qualifying Accounts Valuation and Qualifying Accounts (in millions)
Balance at Beginning of YearAdditions Charged to Statement of Operations AccountsDeductionsBalance at
End of Year
Allowance for obsolescence of spare parts
Year ended December 31, 2021$442 $165 $(19)$588 
Year ended December 31, 2020729 81 (368)442 
Year ended December 31, 2019754 79 (104)729 
Allowance for credit losses on accounts receivable
Year ended December 31, 2021$29 $21 $(22)$28 
Year ended December 31, 202025 25 (21)29 
Year ended December 31, 201924 17 (16)25