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Legal Proceedings, Commitments and Contingencies - Additional Information (Detail) $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Jul. 13, 2015 Subsidiary	Apr. 24, 2009 USD ($)
Legal Proceedings And Contingencies [Line Items]
Damages sought by plaintiff	$ 45
Statutory penalty	13
Total damages	$ 147
Number of subsidiaries held \| Subsidiary					2
Liabilities recorded relative to environmental matters		$ 1,000	$ 965
Environmental costs eligible for future recovery		$ 858	836
Time period environmental costs and recovery of environmental costs are projected over, years		20 years
Percentage of expenditures that are reimbursed for certain remediation activities		50.00%
Total rental expense under operating leases		$ 256	258	$ 315
Future minimum lease commitments, total		793
Future minimum lease commitments, due in 2016		205
Future minimum lease commitments, due in 2017		161
Future minimum lease commitments, due in 2018		128
Future minimum lease commitments, due in 2019		101
Future minimum lease commitments, due in 2020		64
Future minimum lease commitments, due in later years		134
Outstanding letters of credit, surety bonds, and third-party guarantees		3,800	2,400
Third-party guarantees outstanding		$ 678	$ 774
Percentage of total guarantees that relate to guarantees of contractual performance of joint ventures		79.00%	85.00%
Total equity method investment		$ 1,300	$ 971
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
United Launch Alliance
Legal Proceedings And Contingencies [Line Items]
Percentage of ownership interest in affiliated entity		50.00%
Inventory supply agreement		$ 120
Amount of net assets that exceeded book value of investment that is being recognized		395
Total equity method investment		748	$ 706
United Launch Alliance \| Amortized in 2016
Legal Proceedings And Contingencies [Line Items]
Amount of net assets that exceeded book value of investment that is being recognized		$ 40