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Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |  |  |
Remeasurement of deferred tax asset |  | $ 1,900 |  |  |
Deferred tax asset, increase (decrease), amount | $ 1,900 |  |  |  |
Effect of change on earnings per share (in dollars per share) |  | $ 6.80 | $ 6.69 |  |
Total net state income tax expense |  |  | $ 103 | $ 112 | $ 106
U.S. manufacturing deduction benefit (insignificant) |  |  | 7 | 117 | 123
Recognized tax benefit for the impact of the tax credit |  |  | 115 | 107 | 70
Net deferred tax expense (benefit) |  |  | 1,613 | (231) | (473)
Unrecognized tax benefits | 0 | $ 0 | 0 | 0 |
Deemed repatriated earnings | $ 435 | $ 435 | 435 |  |
Tax cuts and jobs act Of 2017, incomplete accounting, transition tax for accumulated foreign earnings, income tax expense (benefit) |  |  | 43 |  |
Undistributed earnings of foreign subsidiaries not taxed to U.S. income taxes and foreign withholding taxes |  |  |  | 386 | 310
Federal and foreign income tax payments made, net of refunds received |  |  | $ 1,100 | 1,300 | 1,800
Internal Revenue Service (IRS) | Earliest Tax Year |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Tax years subject to examination |  |  | 2015 |  |
Internal Revenue Service (IRS) | Tax Year 2016 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Tax years subject to examination |  |  | 2016 |  |
Internal Revenue Service (IRS) | Tax Year 2017 |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Tax years subject to examination |  |  | 2017 |  |
Lockheed Martin Commercial Flight Training |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Asset impairment charges |  |  |  |  | 90
Net deferred tax expense (benefit) |  |  |  |  | $ (80)
Tax benefit reduced the effective income tax rate |  |  |  |  | 1.20%
Unaudited Supplemental Pro Forma Financial Information |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Tax cuts and jobs act Of 2017, incomplete accounting, transition tax for accumulated foreign earnings, income tax expense (benefit) |  |  |  | 64 | $ 49
Accounting Standards Update 2016-09 | Restatement Adjustment | Adjustments for New Accounting Principle, Early Adoption |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Excess income tax benefit from share-based compensation, operating activities |  |  | $ 106 | $ 152 |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 + Details
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- Definition Amount of state and local current and deferred income tax expense (benefit) attributable to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a)-(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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