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Legal Proceedings, Commitments and Contingencies (Detail) $ in Millions |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 19, 2018 USD ($) | Aug. 16, 2016 USD ($) | Dec. 31, 2014 | Dec. 31, 2018 USD ($) subsidiary | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | May 31, 2017 lawsuit | Apr. 24, 2009 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Damages sought by plaintiff | $ 52 |  |  |  |  |  |  |
Liabilities recorded relative to environmental matters |  |  |  | $ 864 | $ 920 |  |  |
Environmental costs eligible for future recovery |  |  |  | $ 750 | 799 |  |  |
Time period environmental costs and recovery of environmental costs are projected over, years |  |  |  | 20 years |  |  |  |
Total rental expense under operating leases |  |  |  | $ 247 | 169 | $ 202 |  |
Future minimum lease commitments, total |  |  |  | 1,300 |  |  |  |
Future minimum lease commitments, due in 2019 |  |  |  | 305 |  |  |  |
Future minimum lease commitments, due in 2020 |  |  |  | 184 |  |  |  |
Future minimum lease commitments, due in 2021 |  |  |  | 147 |  |  |  |
Future minimum lease commitments, due in 2022 |  |  |  | 114 |  |  |  |
Future minimum lease commitments, due in 2023 |  |  |  | 88 |  |  |  |
Future minimum lease commitments, due in later years |  |  |  | 459 |  |  |  |
Outstanding letters of credit, surety bonds, and third-party guarantees |  |  |  | 3,600 | 3,300 |  |  |
Third-party guarantees outstanding |  |  |  | $ 850 | $ 750 |  |  |
Percentage of total guarantees that relate to guarantees of contractual performance of joint ventures |  |  |  | 65.00% | 62.00% |  |  |
Total equity method investment |  |  |  | $ 1,200 | $ 1,400 |  |  |
United Launch Alliance |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Percentage of ownership interest in affiliated entity |  |  |  | 50.00% |  |  |  |
Total equity method investment |  |  |  | $ 687 | $ 794 |  |  |
N.Y. Metropolitan Transportation Authority |  |  |  |  |  |  |  |
Loss 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 |  |  |  |
Period of bench trial |  |  | 35 days |  |  |  |  |
Sikorsky Aircraft Corporation |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of pending lawsuits | lawsuit |  |  |  |  |  |  | 2 |
Number of entities involved in litigation | subsidiary |  |  |  | 2 |  |  |  |
Leidos Holdings, Inc. [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Reserve transferred |  | $ 38 |  |  |  |  |  |
Indemnification percent, up to maximum reserve |  |  |  |  |  | 100.00% |  |
Maximum reserve |  |  |  | $ 64 |  |  |  |
Indemnification percent, in excess of maximum reserve |  |  |  |  |  | 50.00% |  |

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