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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2020
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, 2020$784 $100 $(394)$490 
Year ended December 31, 2019814 91 (121)784 
Year ended December 31, 2018769 70 (25)814 
Allowance for credit losses on accounts receivable
Year ended December 31, 2020$31 $27 $(22)$36 
Year ended December 31, 201929 19 (17)31 
Year ended December 31, 201824 42 (37)29 
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, 2020$729 $81 $(368)$442 
Year ended December 31, 2019754 79 (104)729 
Year ended December 31, 2018717 57 (20)754 
Allowance for credit losses on accounts receivable
Year ended December 31, 2020$25 $25 $(21)$29 
Year ended December 31, 201924 17 (16)25 
Year ended December 31, 201821 39 (36)24