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Legal Proceedings, Commitments and Contingencies (Detail) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Nov. 30, 2017 lawsuit | Apr. 24, 2009 USD ($)
Legal Proceedings And Contingencies [Line Items] |  |  |  |  |
Damages sought by plaintiff | $ 52 |  |  |  |
Liabilities recorded relative to environmental matters | 920 | $ 1,000 |  |  |
Environmental costs eligible for future recovery | $ 799 | 870 |  |  |
Time period environmental costs and recovery of environmental costs are projected over, years | 20 years |  |  |  |
Total rental expense under operating leases | $ 169 | 202 | $ 195 |  |
Future minimum lease commitments, total | 623 |  |  |  |
Future minimum lease commitments, due in 2018 | 162 |  |  |  |
Future minimum lease commitments, due in 2019 | 154 |  |  |  |
Future minimum lease commitments, due in 2020 | 116 |  |  |  |
Future minimum lease commitments, due in 2021 | 82 |  |  |  |
Future minimum lease commitments, due in 2022 | 54 |  |  |  |
Future minimum lease commitments, due in later years | 55 |  |  |  |
Outstanding letters of credit, surety bonds, and third-party guarantees | 3,300 | 3,700 |  |  |
Third-party guarantees outstanding | $ 750 | $ 709 |  |  |
Percentage of total guarantees that relate to guarantees of contractual performance of joint ventures | 62.00% | 56.00% |  |  |
Total equity method investment | $ 1,400 | $ 1,400 |  |  |
United Launch Alliance |  |  |  |  |
Legal Proceedings And Contingencies [Line Items] |  |  |  |  |
Percentage of ownership interest in affiliated entity | 50.00% |  |  |  |
Inventory supply agreement | $ 120 |  |  |  |
Total equity method investment | 794 | $ 788 |  |  |
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 |  |  |  |
Sikorsky Aircraft Corporation |  |  |  |  |
Legal Proceedings And Contingencies [Line Items] |  |  |  |  |
Number of pending lawsuits | lawsuit |  |  |  | 2 |

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