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Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 8 Months Ended | 12 Months Ended | 28 Months Ended |  |
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Dec. 31, 2018 USD ($) program $ / shares | Mar. 26, 2017 USD ($) $ / shares | Aug. 23, 2016 | Dec. 31, 2018 USD ($) contract program $ / shares | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2018 USD ($) program | Aug. 24, 2016 | Aug. 16, 2016
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Number of contract types | contract |  |  |  | 3 |  |  |  |  |
Ending backlog | $ 130,500,000,000 |  |  | $ 130,500,000,000 |  |  | $ 130,500,000,000 |  |
Performance obligation satisfied in previous period |  |  |  | 2,000,000,000 | $ 1,800,000,000 | $ 1,400,000,000 |  |  |
Independent research and development costs charged to cost of sales |  |  |  | $ 1,300,000,000 | 1,200,000,000 | 988,000,000 |  |  |
Weighted average remaining contractual life, vested |  |  |  | 3 years |  |  |  |  |
Financing receivable, significant sales |  |  |  | $ 532,000,000 | 698,000,000 |  |  |  |
Gain (loss) on sale of accounts receivable |  |  |  | 0 | 0 |  |  |  |
Depreciation |  |  |  | 759,000,000 | 760,000,000 | 747,000,000 |  |  |
Capitalized internal-use software, net | 447,000,000 |  |  | 447,000,000 | 424,000,000 |  | 447,000,000 |  |
Capitalized internal-use software accumulated amortization | 2,100,000,000 |  |  | 2,100,000,000 | 2,000,000,000 |  | 2,100,000,000 |  |
Goodwill | 10,769,000,000 |  |  | $ 10,769,000,000 | 10,807,000,000 | 10,764,000,000 | 10,769,000,000 |  |
Percentage of gains and losses recognition to the extent exciding greater of plan assets or obligations |  |  |  | 10.00% |  |  |  |  |
Average future service period of employees expected to receive benefits under the plans |  |  |  | 9 years |  |  |  |  |
Time period environmental costs and recovery of environmental costs are projected over, years |  |  |  | 20 years |  |  |  |  |
Fair value of trading securities | 1,300,000,000 |  |  | $ 1,300,000,000 | 1,400,000,000 |  | 1,300,000,000 |  |
Net gains (losses) on marketable securities |  |  |  | (67,000,000) | 150,000,000 | 66,000,000 |  |  |
Total equity method investments | 1,200,000,000 |  |  | 1,200,000,000 | 1,400,000,000 |  | 1,200,000,000 |  |
Net earnings from equity method investments |  |  |  | 119,000,000 | 207,000,000 | 443,000,000 |  |  |
Contracts Accounted for under Percentage of Completion |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Increase in operating profit due to profit rate adjustments |  |  |  | 1,900,000,000 | 1,600,000,000 | 1,400,000,000 |  |  |
Increase in net earnings due to profit rate adjustments |  |  |  | $ 1,500,000,000 | $ 1,100,000,000 | $ 910,000,000 |  |  |
Increase in diluted earnings per common share due to profit rate (in dollars per share) | $ / shares |  |  |  | $ 5.23 | $ 3.79 | $ 3.00 |  |  |
Minimum |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized |  |  |  | 3 years |  |  |  |  |
Minimum | Customer programs |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized |  |  |  | 9 years |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized |  |  |  | 20 years |  |  |  |  |
Maximum | Customer programs |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets are amortized |  |  |  | 20 years |  |  |  |  |
Designated as hedges | Interest rate swaps |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Aggregate notional amount of derivatives | 1,300,000,000 |  |  | $ 1,300,000,000 | $ 1,200,000,000 |  | 1,300,000,000 |  |
Designated as hedges | Foreign currency contracts |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Aggregate notional amount of derivatives | $ 3,500,000,000 |  |  | $ 3,500,000,000 | 4,100,000,000 |  | $ 3,500,000,000 |  |
Space |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Number of commercial satellite programs with performance issues | program | 2 |  |  | 2 |  |  | 2 |  |
Goodwill | $ 1,585,000,000 |  |  | $ 1,585,000,000 | 1,587,000,000 | $ 1,585,000,000 | $ 1,585,000,000 |  |
Net earnings from equity method investments |  |  |  | $ 210,000,000 | 205,000,000 | 325,000,000 |  |  |
Buildings | Minimum |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated life (years) |  |  |  | 10 years |  |  |  |  |
Buildings | Maximum |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated life (years) |  |  |  | 40 years |  |  |  |  |
Machinery and equipment | Minimum |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated life (years) |  |  |  | 5 years |  |  |  |  |
Machinery and equipment | Maximum |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated life (years) |  |  |  | 15 years |  |  |  |  |
Capitalized Software |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Capitalized internal-use software amortization |  |  |  | $ 106,000,000 | 123,000,000 | $ 136,000,000 |  |  |
Capitalized Software | Minimum |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated life (years) |  |  |  | 2 years |  |  |  |  |
Capitalized Software | Maximum |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated life (years) |  |  |  | 6 years |  |  |  |  |
AWE Management Limited |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest percentage owned immediately before acquisition |  |  |  |  |  |  |  | 33.00% | 33.00%
Ownership interest percentage owned subsequent acquisition |  |  |  |  |  |  |  | 51.00% |
Segment Concentration Risk | Net Sales | AWE Management Limited | Space |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  | 100.00% |  |  | 100.00% |  |
Segment Concentration Risk | Operating profit | AWE Management Limited | Space |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Concentration percentage |  |  |  | 51.00% |  | 51.00% | 51.00% |  |
Equity Method Investment Risk | Net Sales | AWE Management Limited | Space |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Concentration percentage |  |  | 0.00% |  |  |  |  |  |
Equity Method Investment Risk | Net Earnings | AWE Management Limited | Space |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Concentration percentage |  |  | 33.00% |  |  |  |  |  |
EADGE-T |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Contract loss incurred, gross |  | $ 120,000,000 |  |  |  |  |  |  |
Contract loss incurred, after tax |  | $ 74,000,000 |  |  |  |  |  |  |
Contract loss incurred, after tax (in dollars per share) | $ / shares |  | $ 0.25 |  |  |  |  |  |  |
Commercial satellite cumulative losses on development | 260,000,000 |  |  | $ 260,000,000 | $ 260,000,000 |  | $ 260,000,000 |  |
LM2100 |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Contract loss incurred, gross |  |  |  | 75,000,000 |  |  |  |  |
Contract loss incurred, after tax |  |  |  | $ 56,000,000 |  |  |  |  |
Contract loss incurred, after tax (in dollars per share) | $ / shares |  |  |  | $ 0.20 |  |  |  |  |
Commercial satellite cumulative losses on development | 380,000,000 |  |  | $ 380,000,000 |  |  | 380,000,000 |  |
Warrior Capability Sustainment Program |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Contract loss incurred, gross |  |  |  | 85,000,000 |  |  |  |  |
Contract loss incurred, after tax |  |  |  | $ 64,000,000 |  |  |  |  |
Contract loss incurred, after tax (in dollars per share) | $ / shares |  |  |  | $ 0.22 |  |  |  |  |
Commercial satellite cumulative losses on development | $ 140,000,000 |  |  | $ 140,000,000 |  |  | $ 140,000,000 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01 |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |  |  |  |
Revenue, remaining performance obligation, percentage | 38.00% |  |  | 38.00% |  |  | 38.00% |  |
Expected time of satisfaction | 12 months |  |  | 12 months |  |  | 12 months |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01 |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |  |  |  |
Revenue, remaining performance obligation, percentage | 66.00% |  |  | 66.00% |  |  | 66.00% |  |
Expected time of satisfaction | 12 months |  |  | 12 months |  |  | 12 months |  |
AMMROC |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Equity method investee impairment | $ 110,000,000 | $ 64,000,000 |  |  |  |  |  |  |
Increase in net earnings due to profit rate adjustments | $ 83,000,000 | $ 40,000,000 |  |  |  |  |  |  |
Increase in diluted earnings per common share due to profit rate adjustments (in dollars per share) | $ / shares | $ 0.29 | $ 0.14 |  |  |  |  |  |  |

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