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Legal Proceedings and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2015 | Sep. 25, 2016 | Dec. 31, 2015 | Apr. 24, 2009
Legal Proceedings And Contingencies [Line Items] |  |  |  |
Liabilities recorded relative to environmental matters |  | $ 1,000 | $ 1,000 |
Environmental costs eligible for future recovery |  | $ 896 | 858 |
Time period environmental costs and recovery of environmental costs are projected over, years |  | 20 years |  |
Percentage of expenditures that are reimbursed for certain remediation activities |  | 50.00% |  |
Outstanding letters of credit, surety bonds, and third-party guarantees |  | $ 3,800 | 3,800 |
Third-party guarantees outstanding |  | $ 694 | $ 678 |
Percentage of total guarantees that relate to guarantees of contractual performance of joint ventures |  | 55.00% | 79.00% |
Information Systems & Global Solutions | Contractual performance |  |  |  |
Legal Proceedings And Contingencies [Line Items] |  |  |  |
Third-party guarantees outstanding |  | $ 278 |  |
Percentage of total guarantees that relate to guarantees of contractual performance of joint ventures |  | 40.00% |  |
Minimum |  |  |  |
Legal Proceedings And Contingencies [Line Items] |  |  |  |
Damages sought by plaintiff | $ 45 |  |  |
United Launch Alliance |  |  |  |
Legal Proceedings And Contingencies [Line Items] |  |  |  |
Percentage of ownership interest in affiliated entity |  | 50.00% |  |
Inventory supply agreement |  | $ 120 |  |
N.Y. Metropolitan Transportation Authority |  |  |  |
Legal Proceedings And Contingencies [Line Items] |  |  |  |
Damages sought by plaintiff |  | 190 |  |
Contract value |  |  |  | $ 323
Contract payments received to date |  | 241 |  |
Claims for monetary damages against the plaintiff |  | $ 95 |  |

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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