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New Accounting Pronouncements - Adjustments (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle |  |  |
Prepaid expenses and other current assets | $ 239 |  | $ 310
Flight equipment | 21,736 |  | 21,753
Assets constructed for others | 172 |  | 1,768
Less allowance for depreciation and amortization | (10,445) |  | (9,731)
Operating lease right-of-use assets | 1,352 |  | 0
Other assets | 653 |  | 720
Total assets | 26,467 |  | 26,243
Accounts payable | 1,274 |  | 1,416
Accrued liabilities | 1,456 |  | 1,749
Current operating lease liabilities | 332 |  | 0
Current maturities of long-term debt | 637 |  | 606
Long-term debt less current maturities | 2,398 |  | 2,771
Deferred income taxes | 2,643 |  | 2,427
Construction obligation | 172 |  | 1,701
Noncurrent operating lease liabilities | 1,014 |  | 0
Other noncurrent liabilities | 644 |  | 650
Retained earnings | 17,525 |  | 15,967
Total liabilities and stockholders' equity | $ 26,467 |  | $ 26,243
ASU 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |
Prepaid expenses and other current assets |  | $ (1) |
Flight equipment |  | (110) |
Assets constructed for others |  | (1,669) |
Less allowance for depreciation and amortization |  | 164 |
Operating lease right-of-use assets |  | 1,466 |
Other assets |  | (121) |
Total assets |  | (271) |
Accounts payable |  | (8) |
Accrued liabilities |  | (37) |
Current operating lease liabilities |  | 355 |
Current maturities of long-term debt |  | (14) |
Long-term debt less current maturities |  | (96) |
Deferred income taxes |  | 17 |
Construction obligation |  | (1,602) |
Noncurrent operating lease liabilities |  | 1,119 |
Other noncurrent liabilities |  | (60) |
Retained earnings |  | 55 |
Total liabilities and stockholders' equity |  | (271) |
Balances Removed Under Prior Accounting | ASU 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |
Prepaid expenses and other current assets |  | 1 |
Flight equipment |  | 0 |
Assets constructed for others |  | 1,669 |
Less allowance for depreciation and amortization |  | (166) |
Operating lease right-of-use assets |  | 0 |
Other assets |  | 121 |
Total assets |  | 1,625 |
Accounts payable |  | 8 |
Accrued liabilities |  | 37 |
Current operating lease liabilities |  | 0 |
Current maturities of long-term debt |  | 0 |
Long-term debt less current maturities |  | 0 |
Deferred income taxes |  | (17) |
Construction obligation |  | 1,602 |
Noncurrent operating lease liabilities |  | 0 |
Other noncurrent liabilities |  | 60 |
Retained earnings |  | (65) |
Total liabilities and stockholders' equity |  | 1,625 |
Balances Added Under New Lease Standard | ASU 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |
Prepaid expenses and other current assets |  | 0 |
Flight equipment |  | (110) |
Assets constructed for others |  | 0 |
Less allowance for depreciation and amortization |  | (2) |
Operating lease right-of-use assets |  | 1,466 |
Other assets |  | 0 |
Total assets |  | 1,354 |
Accounts payable |  | 0 |
Accrued liabilities |  | 0 |
Current operating lease liabilities |  | 355 |
Current maturities of long-term debt |  | (14) |
Long-term debt less current maturities |  | (96) |
Deferred income taxes |  | 0 |
Construction obligation |  | 0 |
Noncurrent operating lease liabilities |  | 1,119 |
Other noncurrent liabilities |  | 0 |
Retained earnings |  | (10) |
Total liabilities and stockholders' equity |  | $ 1,354 |

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