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Recently Issued Accounting Standards - Impact of the Adoption of the New Lease Standard on the Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Receivables, less allowance for doubtful accounts $ 1,789 $ 1,426 [1]
Prepaid expenses and other 780 733 [1]
Flight equipment, owned and finance leases 33,705 32,599 [1]
Other property and equipment, owned and finance leases 7,165 6,889 [1]
Operating lease right-of-use assets 5,065 5,262 [1]
Current maturities of finance leases 133 123 [1]
Current maturities of operating leases 639 719 [1]
Other current liabilities 601 553 [1]
Long-term obligations under finance leases 236 224 [1]
Long-term obligations under operating leases 5,145 5,276 [1]
Deferred income taxes 898 828 [1]
Other long-term liabilities 998 1,010 [1]
Retained earnings $ 6,999 6,715 [1]
As Reported    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Receivables, less allowance for doubtful accounts   1,346
Prepaid expenses and other   913
Flight equipment, owned and finance leases   32,636
Other property and equipment, owned and finance leases   7,930
Less-Accumulated depreciation and amortization, owned and finance leases   (13,414)
Operating lease right-of-use assets   0
Current maturities of finance leases   149
Current maturities of operating leases   0
Other current liabilities   619
Long-term obligations under finance leases   1,134
Long-term obligations under operating leases   0
Deferred income taxes   814
Other long-term liabilities   1,832
Retained earnings   6,668
New Lease Standard | Adjustments    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Receivables, less allowance for doubtful accounts   80
Prepaid expenses and other   (180)
Flight equipment, owned and finance leases   (37)
Other property and equipment, owned and finance leases   (1,041)
Less-Accumulated depreciation and amortization, owned and finance leases   148
Operating lease right-of-use assets   5,262
Current maturities of finance leases   (26)
Current maturities of operating leases   719
Other current liabilities   (66)
Long-term obligations under finance leases   (910)
Long-term obligations under operating leases   5,276
Deferred income taxes   14
Other long-term liabilities   (822)
Retained earnings   $ 47
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.