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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Ownership interest 50.00%    
Accumulated depreciation and amortization $ 10,871 $ 9,340  
Depreciation and amortization expense related to property and equipment 1,800 1,700 $ 1,600
Amortization of capitalized software 148 129 110
Net book value of capitalized software 420 411  
Advertising expense 225 225 $ 225
Pension plan fair value $ 10,030 10,351  
Minimum      
Spare parts, estimated residual value 5.00%    
Maximum      
Spare parts, estimated residual value 10.00%    
Software and software development costs | Minimum      
Estimated useful life 3 years    
Software and software development costs | Maximum      
Estimated useful life 7 years    
New Accounting Principle | Prepaid expenses      
Reclassification adjustment   32  
New Accounting Principle | Current debt      
Reclassification adjustment   32  
New Accounting Principle | Noncurrent assets      
Reclassification adjustment   84  
New Accounting Principle | Long-term debt      
Reclassification adjustment   84  
New Accounting Principle | Current Assets      
Reclassification adjustment   3,300  
New Accounting Principle | Deferred Income Taxes      
Reclassification adjustment   $ 3,300  
Grupo Aeromexico      
Loss on available for sales securties $ 66