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Reconciliation of Benefit Obligations, Plan Assets, and Unfunded or Funded Status (Parenthetical) (Detail) - USD ($) $ in Millions |  | 12 Months Ended
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Nov. 06, 2015 | Dec. 31, 2016
Qualified defined benefit pension plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Acquisition increased qualified defined benefit pension obligation | $ 30 |
Qualified defined benefit pension plans | Information Systems & Global Solutions |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Special termination benefits |  | $ 27
Retiree medical and life insurance plans | Information Systems & Global Solutions |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Special termination benefits |  | $ 9

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- Definition The amount of increase in the benefit obligation attributed to business combinations. + 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)(8) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The amount of increase related to special termination benefits offered to and accepted by employees in connection with their termination of employment that are only offered for a short period of time. A situation involving termination benefits may also involve a curtailment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Termination Benefits -URI http://asc.fasb.org/extlink&oid=6526498 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)(10) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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