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Recently Issued Accounting Standards - Impact of the Adoption of the New Lease Standard on the Statement of Consolidated Operations (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Regional capacity purchase $ 688 $ 630 [1]
Landing fees and other rent 588 579 [1]
Depreciation and amortization 547 524 [1]
Interest expense (188) (162) [1]
Interest capitalized 22 18 [1]
Net income $ 292 $ 145 [1],[2],[3]
Earnings per share, basic and diluted (in dollars per share) $ 1.09 $ 0.51 [1]
As Reported    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Regional capacity purchase   $ 619
Landing fees and other rent   558
Depreciation and amortization   541
Interest expense   (176)
Interest capitalized   19
Net income   $ 147
Earnings per share, basic and diluted (in dollars per share)   $ 0.52
New Lease Standard | Adjustments    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Regional capacity purchase   $ 11
Landing fees and other rent   21
Depreciation and amortization   (17)
Interest expense   14
Interest capitalized   (1)
Net income   $ (2)
Earnings per share, basic and diluted (in dollars per share)   $ (0.01)
[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.
[2] 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.
[3] 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.