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Postretirement Benefit Plans - Reconciliation of Benefit Obligations, Plan Assets, and Unfunded or Funded Status (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Change in plan assets |  |  |
Beginning balance at fair value | $ 33,204 |  |
Ending balance at fair value | 34,978 | $ 33,204 |
Qualified Defined Benefit Pension Plans |  |  |
Change in benefit obligation |  |  |
Beginning balance | 45,064 | 43,702 |
Service cost | 820 | 827 | $ 836
Interest cost | 1,809 | 1,861 | 1,791
Benefits paid | (2,310) | (2,172) |
Actuarial losses (gains) | 3,377 | 1,402 |
Changes in longevity assumptions | (352) | (687) |
Plan amendments and acquisitions | 278 | 110 |
Service cost related to discontinued operations | 0 | 21 |
Medicare Part D subsidy | 0 | 0 |
Participants’ contributions | 0 | 0 |
Ending balance | 48,686 | 45,064 | 43,702
Change in plan assets |  |  |
Beginning balance at fair value | 31,417 | 32,096 |
Actual return on plan assets | 3,942 | 1,470 |
Benefits paid | (2,310) | (2,172) |
Company contributions | 0 |  |
Medicare Part D subsidy | 0 | 0 |
Participants’ contributions | 0 | 0 |
Ending balance at fair value | 33,095 | 31,417 | 32,096
Unfunded status of the plans | (15,591) | (13,647) |
Qualified Defined Benefit Pension Plans | Information Systems & Global Solutions |  |  |
Change in plan assets |  |  |
Special termination benefits |  | 27 |
Retiree Medical and Life Insurance Plans |  |  |
Change in benefit obligation |  |  |
Beginning balance | 2,649 | 2,883 |
Service cost | 20 | 24 | 21
Interest cost | 102 | 119 | 110
Benefits paid | (232) | (222) |
Actuarial losses (gains) | 23 | (135) |
Changes in longevity assumptions | (24) | (53) |
Plan amendments and acquisitions | 0 | (32) |
Service cost related to discontinued operations | 0 | 0 |
Medicare Part D subsidy | 0 | 4 |
Participants’ contributions | 64 | 61 |
Ending balance | 2,602 | 2,649 | 2,883
Change in plan assets |  |  |
Beginning balance at fair value | 1,787 | 1,813 |
Actual return on plan assets | 224 | 95 |
Benefits paid | (232) | (222) |
Company contributions | 40 | 36 |
Medicare Part D subsidy | 0 | 4 |
Participants’ contributions | 64 | 61 |
Ending balance at fair value | 1,883 | 1,787 | $ 1,813
Unfunded status of the plans | (719) | (862) |
Retiree Medical and Life Insurance Plans | Information Systems & Global Solutions |  |  |
Change in plan assets |  |  |
Special termination benefits |  | 9 |
Sikorsky Aircraft Corporation | Qualified Defined Benefit Pension Plans |  |  |
Change in plan assets |  |  |
Company contributions | $ 46 | $ 23 |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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