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Postretirement Benefit Plans - Amounts Recognized on Balance Sheets Related to Qualified Defined Benefit Pension Plans and Retiree Medical and Life Insurance Plans (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Accrued postretirement benefit liabilities $ (15,703) $ (13,855)  
Accumulated other comprehensive loss (pre-tax) related to:      
Recognition of net prior service credits from divestiture of IS&GS segment 0 (134) $ 0
Accumulated other comprehensive loss, after tax 12,600 12,000  
Qualified Defined Benefit Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Prepaid pension asset 112 208  
Accrued postretirement benefit liabilities (15,703) (13,855)  
Accumulated other comprehensive loss (pre-tax) related to:      
Net actuarial losses 20,169 20,184  
Prior service (credit) cost (2,263) (2,896)  
Total 17,906 17,288  
Accumulated other comprehensive loss, after tax 11,800 11,200  
Adjustments, before tax 17,906 17,288  
Retiree Medical and Life Insurance Plans      
Defined Benefit Plan Disclosure [Line Items]      
Prepaid pension asset 0 0  
Accrued postretirement benefit liabilities (719) (862)  
Accumulated other comprehensive loss (pre-tax) related to:      
Net actuarial losses 331 447  
Prior service (credit) cost 81 96  
Total 412 543  
Accumulated other comprehensive loss, after tax 252 351  
Adjustments, before tax 412 543  
Other Pension Plan      
Accumulated other comprehensive loss (pre-tax) related to:      
Total 705 677  
Accumulated other comprehensive loss, after tax 479 448  
Adjustments, before tax 705 677  
Discontinued Operations | Information Systems & Global Solutions      
Accumulated other comprehensive loss (pre-tax) related to:      
Recognition of net prior service credits from divestiture of IS&GS segment   134  
Prior service (credit) cost | Qualified Defined Benefit Pension Plans | Information Systems & Global Solutions      
Accumulated other comprehensive loss (pre-tax) related to:      
Prior service (credit) cost   (210)  
Prior service (credit) cost | Retiree Medical and Life Insurance Plans | Information Systems & Global Solutions      
Accumulated other comprehensive loss (pre-tax) related to:      
Prior service (credit) cost   9  
Nonqualified Plan      
Accumulated other comprehensive loss (pre-tax) related to:      
Net actuarial losses $ 646 $ 642