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v3.8.0.1

Income Taxes (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 35.00% |  |
DEFERRED TAX LIABILITIES: |  |  |
Accelerated depreciation | $ 3,193 | $ 4,726 |
Other | 86 | 134 |
Deferred Tax Liabilities, Gross | 3,279 | 4,860 |
DEFERRED TAX ASSETS: |  |  |
Fuel derivative instruments | 12 | 233 |
Deferred tax assets construction obligation | 326 | 402 |
Accrued employee benefits | 309 | 451 |
Other | 274 | 400 |
Total deferred tax assets | 921 | 1,486 |
Total deferred tax liabilities | 2,358 | 3,374 |
CURRENT: |  |  |
Federal | 904 | 778 | $ 1,292
State | 72 | 69 | 114
Total current | 976 | 847 | 1,406
DEFERRED: |  |  |
Federal | 192 | 426 | (97)
State | 5 | 30 | (11)
Change in federal statutory rate | (1,410) | 0 | 0
Total deferred | (1,213) | 456 | (108)
Total | (237) | 1,303 | 1,298
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |
Tax at statutory U.S. tax rates | 1,138 | 1,241 | 1,218
State income taxes, net of federal benefit | 50 | 64 | 66
Change in federal statutory rate | (1,410) | 0 | 0
Other, net | $ (15) | $ (2) | $ 14

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