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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | $ (776) | $ 1,477 | $ 3,097
Other comprehensive (loss) income before reclassifications | (606) | (1,260) | (1,232)
Amounts reclassified from AOCL |  |  |
Amounts reclassified from AOCL | 1,232 | 823 | 574
Other comprehensive income (loss), net of tax | 626 | (437) | (658)
Reclassification of income tax effects from tax reform | 2,400 |  |
Ending Balance | 1,449 | (776) | 1,477
Postretirement Benefit Plans |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (12,559) | (11,981) | (11,314)
Other comprehensive (loss) income before reclassifications | (501) | (1,380) | (1,232)
Amounts reclassified from AOCL |  |  |
Amounts reclassified from AOCL | 1,202 | 802 | 565
Other comprehensive income (loss), net of tax | 701 | (578) | (667)
Reclassification of income tax effects from tax reform | (2,396) |  |
Ending Balance | (14,254) | (12,559) | (11,981)
AOCI related to postretirement benefit plans, tax benefit | 3,900 | 6,500 | 6,500
Other, net |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | 20 | (121) | (130)
Other comprehensive (loss) income before reclassifications | (105) | 120 | 0
Amounts reclassified from AOCL |  |  |
Amounts reclassified from AOCL | 30 | 21 | 9
Other comprehensive income (loss), net of tax | (75) | 141 | 9
Reclassification of income tax effects from tax reform | (12) |  |
Ending Balance | (67) | 20 | (121)
AOCL |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |
Beginning Balance | (12,539) | (12,102) | (11,444)
Amounts reclassified from AOCL |  |  |
Other comprehensive income (loss), net of tax | 626 | (437) | (658)
Reclassification of income tax effects from tax reform | (2,408) |  |
Ending Balance | (14,321) | (12,539) | (12,102)
Recognition of net actuarial losses |  |  |
Amounts reclassified from AOCL |  |  |
Amounts reclassified from AOCL | 1,455 | 1,030 | 938
Amortization of net prior service credits |  |  |
Amounts reclassified from AOCL |  |  |
Amounts reclassified from AOCL | (253) | (228) | (239)
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 | $ 30 | $ 21 | $ 9

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