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Recently Issued Accounting Standards - Schedule of Adoption of ASC 606 and Expected Impact (Consolidated Balance Sheets) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Prepaid expenses and other | $ 973 | $ 1,071 | [1]
Total current assets | 8,671 | 7,133 | [1]
Total assets | 44,837 | 42,346 | [1]
Advance ticket sales | 5,193 | 3,940 | [1]
Frequent flyer deferred revenue | 2,275 | 2,192 | [1]
Other | 585 | 576 | [1]
Total current liabilities | 13,684 | 12,763 | [1]
Frequent flyer deferred revenue - long-term | 2,712 | 2,591 | [1]
Deferred income taxes | 639 | 204 | [1]
Total other liabilities and deferred credits | 8,350 | 8,150 | [1]
Retained earnings | 6,203 | 4,549 | [1]
Total stockholders' equity | 9,469 | 8,734 | [1]
Total liabilities and stockholders' equity | $ 44,837 | 42,346 | [1]
As Previously Reported |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Prepaid expenses and other |  | 1,051 |
Total current assets |  | 7,113 |
Total assets |  | 42,326 |
Advance ticket sales |  | 3,876 |
Frequent flyer deferred revenue |  | 2,176 |
Other |  | 569 |
Total current liabilities |  | 12,676 |
Frequent flyer deferred revenue - long-term |  | 2,565 |
Deferred income taxes |  | 225 |
Total other liabilities and deferred credits |  | 8,145 |
Retained earnings |  | 4,621 |
Total stockholders' equity |  | 8,806 |
Total liabilities and stockholders' equity |  | 42,326 |
Restatement Adjustment | Accounting Standards Update 2014-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Prepaid expenses and other |  | 20 |
Total current assets |  | 20 |
Total assets |  | 20 |
Advance ticket sales |  | 64 |
Frequent flyer deferred revenue |  | 16 |
Other |  | 7 |
Total current liabilities |  | 87 |
Frequent flyer deferred revenue - long-term |  | 26 |
Deferred income taxes |  | (21) |
Total other liabilities and deferred credits |  | 5 |
Retained earnings |  | (72) |
Total stockholders' equity |  | (72) |
Total liabilities and stockholders' equity |  | $ 20 |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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