Legal Proceedings, Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Apr. 24, 2009
Legal Proceedings And Contingencies [Line Items]
Damages sought by plaintiff	$ 45
Liabilities recorded relative to environmental matters		$ 1,000	$ 1,000
Environmental costs eligible for future recovery		$ 870	858
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		$ 202	195	$ 197
Future minimum lease commitments, total		762
Future minimum lease commitments, due in 2017		179
Future minimum lease commitments, due in 2018		150
Future minimum lease commitments, due in 2019		131
Future minimum lease commitments, due in 2020		103
Future minimum lease commitments, due in 2021		78
Future minimum lease commitments, due in later years		121
Outstanding letters of credit, surety bonds, and third-party guarantees		3,700	3,800
Third-party guarantees outstanding		$ 709	$ 678
Percentage of total guarantees that relate to guarantees of contractual performance of joint ventures		56.00%	79.00%
Amortization of intangible assets		$ 284	$ 68	$ 20
Total equity method investment		1,400	1,300
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
Amortization of intangible assets		40
Total equity method investment		$ 788	$ 748