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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.

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