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Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 USD ($) $ / shares | Jun. 24, 2018 USD ($) $ / shares | Mar. 26, 2017 USD ($) $ / shares | Dec. 31, 2019 USD ($) program contract $ / shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of contract types | contract |  |  |  | 3 |  |
Ending backlog |  |  |  | $ 144,000,000,000.0 |  |
Performance obligation satisfied in previous period |  |  |  | 2,200,000,000 | $ 2,000,000,000.0 | $ 1,800,000,000
Severance and restructuring charges |  |  |  | 0 | 96,000,000 | 0
Independent research and development costs charged to cost of sales |  |  |  | $ 1,300,000,000 | 1,300,000,000 | 1,200,000,000
Weighted average remaining contractual life, vested |  |  |  | 3 years |  |
Financing receivable, significant sales |  |  |  | $ 387,000,000 | 532,000,000 |
Gain (loss) on sale of accounts receivable |  |  |  | 0 | 0 |
Depreciation |  |  |  | 794,000,000 | 759,000,000 | 760,000,000
Capitalized internal-use software, net | $ 447,000,000 |  |  | 511,000,000 | 447,000,000 |
Capitalized internal-use software accumulated amortization | 2,100,000,000 |  |  | 2,200,000,000 | 2,100,000,000 |
Goodwill | 10,769,000,000 |  |  | $ 10,604,000,000 | 10,769,000,000 | 10,807,000,000
Time period environmental costs and recovery of environmental costs are projected over |  |  |  | 20 years |  |
Fair value of trading securities | 1,300,000,000 |  |  | $ 1,800,000,000 | 1,300,000,000 |
Net gains (losses) on marketable securities |  |  |  | 233,000,000 | (67,000,000) | 150,000,000
Total equity method investments | 1,200,000,000 |  |  | 1,200,000,000 | 1,200,000,000 |
Net earnings from equity method investments |  |  |  | 154,000,000 | 119,000,000 | 207,000,000
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 | $ 1,900,000,000 | 1,600,000,000
Increase in net earnings due to profit rate adjustments |  |  |  | $ 1,500,000,000 |  | $ 1,100,000,000
Increase in diluted earnings per common share due to profit rate (in dollars per share) | $ / shares |  |  |  | $ 5.29 | $ 5.23 | $ 3.79
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 |  |  | $ 750,000,000 | $ 1,300,000,000 |
Designated as hedges | Foreign currency contracts |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Aggregate notional amount of derivatives | 3,500,000,000 |  |  | 3,800,000,000 | 3,500,000,000 |
RMS |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Severance and restructuring charges |  | $ 96,000,000 |  | 60,000,000 |  |
Severance and restructuring charges, net of tax |  | $ 76,000,000 |  | $ 47,000,000 |  |
Severance and restructuring charges (in dollars per share) | $ / shares |  | $ 0.26 |  | $ 0.17 |  |
Goodwill | 6,751,000,000 |  |  | $ 6,758,000,000 | 6,751,000,000 | $ 6,784,000,000
Space |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of commercial satellite programs with performance issues | program |  |  |  | 2 |  |
Goodwill | 1,585,000,000 |  |  | $ 1,586,000,000 | 1,585,000,000 | 1,587,000,000
Net earnings from equity method investments |  |  |  | $ 145,000,000 | 210,000,000 | 205,000,000
Buildings | Minimum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated life |  |  |  | 10 years |  |
Buildings | Maximum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated life |  |  |  | 40 years |  |
Machinery and equipment | Minimum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated life |  |  |  | 5 years |  |
Machinery and equipment | Maximum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated life |  |  |  | 15 years |  |
Capitalized Software |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Capitalized internal-use software amortization |  |  |  | $ 111,000,000 | 106,000,000 | 123,000,000
Capitalized Software | Minimum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated life |  |  |  | 2 years |  |
Capitalized Software | Maximum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment, estimated life |  |  |  | 6 years |  |
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
LM2100 |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Commercial satellite cumulative losses on development |  |  |  | 410,000,000 |  |
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 |  |
AMMROC |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Equity method investee impairment | 110,000,000 |  | $ 64,000,000 |  |  |
Equity method investee impairment, net of tax | $ 83,000,000 |  | $ 40,000,000 |  |  |
Equity method investee impairment (in dollars per share) | $ / shares | $ 0.29 |  | $ 0.14 |  |  |
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 |  |  |  | 39.00% |  |
Expected time of satisfaction |  |  |  | 12 months |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01 |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |  |  |  |
Revenue, remaining performance obligation, percentage |  |  |  | 26.00% |  |
Expected time of satisfaction |  |  |  | 12 months |  |
Operations Consolidation [Member] |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Commercial satellite cumulative losses on development |  |  |  | $ 205,000,000 |  |

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