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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 |

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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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