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Income Taxes (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 35.00% |
DEFERRED TAX LIABILITIES: |  |  |
Accelerated depreciation | $ 3,395 | $ 3,123 |
Other | 92 | 83 |
Deferred Tax Liabilities, Gross | 3,487 | 3,206 |
DEFERRED TAX ASSETS: |  |  |
Deferred tax assets construction obligation | 355 | 318 |
Accrued employee benefits | 329 | 301 |
Rapid rewards loyalty liability | 267 | 338 |
Other | 109 | 130 |
Total deferred tax assets | 1,060 | 1,087 |
Total deferred tax liabilities | 2,427 | 2,119 |
CURRENT: |  |  |
Federal | 338 | 904 | $ 778
State | 60 | 72 | 69
Total current | 398 | 976 | 847
DEFERRED: |  |  |
Federal | 299 | 200 | 393
State | 2 | 2 | 27
Change in federal statutory rate | 0 | (1,270) | 0
Total deferred | 301 | (1,068) | 420
Total | 699 | (92) | 1,267
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |
Tax at statutory U.S. tax rates | 664 | 1,143 | 1,208
State income taxes, net of federal benefit | 49 | 50 | 62
Change in federal statutory rate | 0 | (1,270) | 0
Other, net | $ (14) | $ (15) | $ (3)

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