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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