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Special Charges and Unrealized (Gains) Losses on Investments - Narrative (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Jul. 31, 2020
employee
May 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
employee
plane
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2017
USD ($)
employee
Dec. 31, 2020
USD ($)
employee
plane
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Special Charges [Line Items]                            
Cash received under the Payroll Support Program                       $ 5,100,000,000    
Cash received from grants                       3,600,000,000    
Proceeds from the issuance of an unsecured loan                       1,500,000,000    
Proceeds from issuance of warrants                       66,000,000    
Portion of grant recognized as a credit to special charges     $ 453,000,000 $ 1,494,000,000 $ 1,589,000,000 $ 0           $ 3,536,000,000 $ 0 $ 0
Number of employees notified of plans for workforce reduction | employee 36,000                          
Number of employee furloughs | employee     13,000                 13,000    
Number of employees subject to voluntary options | employee     9,000                 9,000    
Severance and benefit expenses     $ 162,000,000 350,000,000 63,000,000 0 $ 2,000,000 $ 2,000,000 $ 6,000,000 $ 6,000,000   $ 575,000,000 16,000,000 41,000,000
Impairment of right-of-use assets                       38,000,000    
Impairments related to cancelled projects                       56,000,000    
Settlement losses related to defined benefit pension plans     41,000,000 415,000,000 231,000,000 0           687,000,000 0 0
Nonoperating unrealized (gains) losses on investments     (101,000,000) (15,000,000) (9,000,000) 319,000,000 (81,000,000) $ (21,000,000) $ (34,000,000) $ (17,000,000)   194,000,000 (153,000,000) 5,000,000
Unrealized loss on derivative assets                       24,000,000 (13,000,000)  
Expected credit loss allowance recorded     0 $ 0 $ 0 $ 697,000,000           697,000,000 0 0
Write-off of unexercised aircraft purchase                         18,000,000  
Other miscellaneous impairments                         20,000,000  
Charges related to contract terminations                         25,000,000  
Charges for the settlement of certain legal matters                         18,000,000  
Costs related to the transition of fleet types                         14,000,000  
Other charges                         2,000,000  
Gain (loss) on change in market value of equity investments                           28,000,000
Gain (loss) due to the change in fair value of derivatives                         13,000,000  
Fair value adjustments related to aircraft purchased off lease, write-off of unexercised aircraft purchase options and other impairments                           66,000,000
One-time termination charge related to engine maintenance service agreements                       0 0 64,000,000
Losses due to the change in fair value of derivatives                           (33,000,000)
COVID-19 [Member]                            
Special Charges [Line Items]                            
Portion of grant recognized as a credit to special charges                       3,500,000,000    
International Brotherhood of Teamsters                            
Special Charges [Line Items]                            
Severance and benefit expenses                         2,000,000 22,000,000
International Brotherhood of Teamsters | Voluntary Early Out Program                            
Special Charges [Line Items]                            
Number of technicians and related employees electing to voluntarily separate from the Company | employee                     1,000      
Severance payment per participant                     $ 100,000      
Management                            
Special Charges [Line Items]                            
Severance and benefit expenses                         14,000,000 19,000,000
Aircraft Engines                            
Special Charges [Line Items]                            
Tangible asset impairment charges                         43,000,000  
Hong Kong Routes                            
Special Charges [Line Items]                            
Intangible assets impairment charges                         90,000,000 $ 206,000,000
Brazil Routes                            
Special Charges [Line Items]                            
Intangible assets impairment charges   $ 105,000,000                        
Azul                            
Special Charges [Line Items]                            
Gain (loss) on equity securities             $ 136,000,000         (180,000,000)    
Gain (loss) on change in market value of equity investments                         $ 140,000,000  
Investments Excluding AVH Derivative Assets                            
Special Charges [Line Items]                            
Nonoperating unrealized (gains) losses on investments                       $ 170,000,000    
Boeing 757-200                            
Special Charges [Line Items]                            
Tangible asset impairment charges     $ 94,000,000                      
Number of planes permanently grounded | plane     11                 11    
Routes                            
Special Charges [Line Items]                            
Intangible assets impairment charges                       $ 130,000,000