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Income Taxes (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
DEFERRED TAX LIABILITIES: |  |  |
Accelerated depreciation | $ 4,726 | $ 4,429 |
Other | 134 | 62 |
Deferred Tax Liabilities, Gross | 4,860 | 4,491 |
DEFERRED TAX ASSETS: |  |  |
Fuel derivative instruments | 233 | 750 |
Deferred tax assets construction obligation | 402 | 289 |
Accrued employee benefits | 451 | 541 |
Other | 400 | 421 |
Total deferred tax assets | 1,486 | 2,001 |
Total deferred tax liabilities | 3,374 | 2,490 |
CURRENT: |  |  |
Federal | 778 | 1,292 | $ 203
State | 69 | 114 | 29
Total current | 847 | 1,406 | 232
DEFERRED: |  |  |
Federal | 426 | (97) | 421
State | 30 | (11) | 27
Total deferred | 456 | (108) | 448
Total | 1,303 | 1,298 | 680
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |
Tax at statutory U.S. tax rates | 1,241 | 1,218 | 636
State income taxes, net of federal benefit | 64 | 66 | 37
Other, net | $ (2) | $ 14 | $ 7

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