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Amounts Recognized on Balance Sheets Related to Qualified Defined Benefit Pension Plans and Retiree Medical and Life Insurance Plans (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive loss, after tax |  | $ (12,102) | $ (11,444)
Information Systems & Global Solutions |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive loss (net of tax) related to prior service (credit) cost |  | (134) |
Qualified defined benefit pension plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive loss (pre-tax) related to prior service (credit) cost | [1] | (2,896) | (3,565)
Accumulated other comprehensive loss before tax | [2] | (17,288) | (16,067)
Accumulated other comprehensive loss after tax |  | (11,200) | (10,400)
Qualified defined benefit pension plans | Information Systems & Global Solutions |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive loss (pre-tax) related to prior service (credit) cost |  | (210) |
Retiree medical and life insurance plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive loss (pre-tax) related to prior service (credit) cost | [1] | 96 | 167
Accumulated other comprehensive loss before tax | [2] | (543) | (794)
Accumulated other comprehensive loss after tax |  | (351) | (514)
Retiree medical and life insurance plans | Information Systems & Global Solutions |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive loss (pre-tax) related to prior service (credit) cost |  | 9 |
Other Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive loss before tax |  | (677) | (620)
Accumulated other comprehensive loss after tax |  | (448) | (408)
Postretirement Benefit Plan Adjustments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive loss, after tax |  | $ (11,981) | $ (11,314)
[1] | Pre-tax amounts of $210 million for qualified pension prior service credits and $9 million for retiree medical prior service costs were recognized from the divestiture of our IS&GS business (combined $134 million, net of tax).
[2] | Accumulated other comprehensive loss related to postretirement benefit plans, after tax, of $12.0 billion and $11.3 billion at December 31, 2016 and 2015 (see "Note 12 - Stockholders' Equity") includes $17.3 billion ($11.2 billion after tax) and $16.1 billion ($10.4 billion after tax) for qualified defined benefit pension plans, $543 million ($351 million after tax) and $794 million ($514 million after tax) for retiree medical and life insurance plans and $677 million ($448 million after tax) and $620 million ($408 million after tax) for other plans.

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- Definition The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. + 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 (j-k) -URI http://asc.fasb.org/extlink&oid=66004124&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 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 5: 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=66004124&loc=SL7669686-108580 + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 3: 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=66004124&loc=SL7669686-108580 + Details
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- Definition The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. + 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 (j) -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 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 + Details
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- Definition Amount after tax of cost (credit) due to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as a component of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 + Details
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- Definition Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=49177896 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -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 -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 + Details
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