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Stockholders' Equity - Changes in Balance of Accumulated Other Comprehensive Loss, Net of Income Taxes (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | $ 1,606 | $ 3,097 | $ 3,400
Other comprehensive (loss) income before reclassifications | (1,260) | (1,232) | (424)
Amounts reclassified from AOCL |  |  |
Amounts reclassified from AOCL | 822 | 574 | 850
Other comprehensive (loss) income, net of tax | (438) | (658) | 426
Ending Balance | (609) | 1,606 | 3,097
Postretirement Benefit Plans |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (11,981) | (11,314) | (11,813)
Other comprehensive (loss) income before reclassifications | (1,380) | (1,232) | (351)
Amounts reclassified from AOCL |  |  |
Amounts reclassified from AOCL | 802 | 565 | 850
Other comprehensive (loss) income, net of tax | (578) | (667) | 499
Ending Balance | (12,559) | (11,981) | (11,314)
AOCI related to postretirement benefit plans, tax benefit | 6,500 | 6,500 | 6,200
Other, net |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (121) | (130) | (57)
Other comprehensive (loss) income before reclassifications | 120 | 0 | (73)
Amounts reclassified from AOCL |  |  |
Amounts reclassified from AOCL | 20 | 9 | 0
Other comprehensive (loss) income, net of tax | 140 | 9 | (73)
Ending Balance | 19 | (121) | (130)
AOCL |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (12,102) | (11,444) | (11,870)
Amounts reclassified from AOCL |  |  |
Other comprehensive (loss) income, net of tax | (438) | (658) | 426
Ending Balance | (12,540) | (12,102) | (11,444)
Recognition of net actuarial losses |  |  |
Amounts reclassified from AOCL |  |  |
Amounts reclassified from AOCL | 1,030 | 938 | 1,109
Amortization of net prior service credits |  |  |
Amounts reclassified from AOCL |  |  |
Amounts reclassified from AOCL | (228) | (239) | $ (259)
Recognition of net prior service credits from divestiture of IS&GS segment |  |  |
Amounts reclassified from AOCL |  |  |
Amounts reclassified from AOCL |  | (134) |
Other |  |  |
Amounts reclassified from AOCL |  |  |
Amounts reclassified from AOCL | $ 20 | $ 9 |

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- Definition Amount of tax expense (benefit) allocated to accumulated other comprehensive income (loss) including portion attributable to noncontrolling interest. + References No definition available. + Details
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