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Reconciliation of Benefit Obligations, Plan Assets, and Unfunded or Funded Status (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Change in plan assets |  |  |  |
Fair value of plan assets at beginning of year |  | $ 33,909 |  |
Fair value of plan assets at end of year |  | 33,204 | $ 33,909 |
Qualified defined benefit pension plans |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligations at beginning of year |  | 43,702 | 45,882 |
Service cost | [1] | 827 | 836 | $ 841
Interest cost | [1] | 1,861 | 1,791 | 1,912
Benefits paid |  | (2,172) | (2,055) |
Actuarial losses (gains) |  | 1,402 | (1,988) |
New longevity assumptions | [2] | (687) | (834) |
Plan amendments and acquisitions | [3] | 110 | 31 |
Service cost related to discontinued operations |  | 21 | 39 |
Benefit obligations at end of year |  | 45,064 | 43,702 | 45,882
Change in plan assets |  |  |  |
Fair value of plan assets at beginning of year |  | 32,096 | 34,673 |
Actual return on plan assets |  | 1,470 | (527) |
Benefits paid |  | (2,172) | (2,055) |
Company contributions |  | 23 | 5 |
Fair value of plan assets at end of year |  | 31,417 | 32,096 | 34,673
Unfunded status of the plans |  | (13,647) | (11,606) |
Retiree medical and life insurance plans |  |  |  |
Change in benefit obligation |  |  |  |
Benefit obligations at beginning of year |  | 2,883 | 3,034 |
Service cost |  | 24 | 21 | 22
Interest cost |  | 119 | 110 | 123
Benefits paid |  | (222) | (307) |
Actuarial losses (gains) |  | (135) | (170) |
New longevity assumptions | [2] | (53) | (77) |
Plan amendments and acquisitions | [3] | (32) | 157 |
Medicare Part D subsidy |  | 4 | 14 |
Participants' contributions |  | 61 | 101 |
Benefit obligations at end of year |  | 2,649 | 2,883 | 3,034
Change in plan assets |  |  |  |
Fair value of plan assets at beginning of year |  | 1,813 | 1,932 |
Actual return on plan assets |  | 95 | (27) |
Benefits paid |  | (222) | (307) |
Company contributions |  | 36 | 100 |
Medicare Part D subsidy |  | 4 | 14 |
Participants' contributions |  | 61 | 101 |
Fair value of plan assets at end of year |  | 1,787 | 1,813 | $ 1,932
Unfunded status of the plans |  | $ (862) | $ (1,070) |
[1] | Total net periodic benefit cost associated with our qualified defined benefit plans represents pension expense calculated in accordance with GAAP (FAS pension expense). We are required to calculate pension expense in accordance with both GAAP and CAS rules, each of which results in a different calculated amount of pension expense. The CAS pension cost is recovered through the pricing of our products and services on U.S. Government contracts and, therefore, is recognized in net sales and cost of sales for products and services. We include the difference between FAS pension expense and CAS pension cost, referred to as the FAS/CAS pension adjustment, as a component of other unallocated, net on our consolidated statements of earnings. The FAS/CAS pension adjustment, which was $902 million in 2016, $400 million in 2015, and $317 million in 2014, effectively adjusts the amount of CAS pension cost in the business segment operating profit so that pension expense recorded on our consolidated statements of earnings is equal to FAS pension expense. FAS pension expense and CAS pension costs reflect the reclassification for discontinued operations presentation of benefits related to former IS&GS salaried employees.
[2] | We adopted new longevity assumptions originally published by the Society of Actuaries in October 2014. The Society of Actuaries refined their original publication in October 2015 and again in October 2016.
[3] | Includes special termination benefits of $27 million for qualified pension and $9 million for retiree medical recognized in 2016 related to former IS&GS salaried employees. The November 2015 acquisition of Sikorsky increased our qualified defined benefit pension obligations by about $30 million.

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- Definition The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost) -URI http://asc.fasb.org/extlink&oid=6504192 Reference 2: 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=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6504226 + Details
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- Definition Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=49168827 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)(4) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + 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 (a) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503904 + Details
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- Definition The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. + 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 -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=49170737 Reference 3: 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=65897934&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Postretirement Benefits -URI http://asc.fasb.org/extlink&oid=6521376 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total. + 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 (c) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 + Details
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