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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 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Receivables, less allowance for doubtful accounts | $ 1,762 | $ 1,426 | [1]
Prepaid expenses and other | 708 | 733 | [1]
Flight equipment, owned and finance leases | 33,890 | 32,599 | [1]
Other property and equipment, owned and finance leases | 7,371 | 6,889 | [1]
Accumulated depreciation and amortization, owned and finance leases | (13,694) | (13,266) | [1]
Operating lease right-of-use assets | 4,908 | 5,262 | [1]
Current maturities of finance leases | 117 | 123 | [1]
Current maturities of operating leases | 637 | 719 | [1]
Other current liabilities | 604 | 553 | [1]
Long-term obligations under finance leases | 202 | 224 | [1]
Long-term obligations under operating leases | 5,034 | 5,276 | [1]
Deferred income taxes | 1,192 | 828 | [1]
Other long-term liabilities | 980 | 1,010 | [1]
Retained earnings | $ 8,050 | 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 |
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) |
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.

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