Inventories and Contracts in Progress (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Notes to Condensed Consolidated Financial Statements [Abstract]
Raw materials	$ 2,038	$ 1,983
Work-in-process	4,993	4,600
Finished goods	3,653	3,360
Contracts in progress	8,029	7,929
Inventory before payments and billings	18,713	17,872
Progress payments, secured by lien, on U.S. Government contracts	(372)	(279)
Billings on contracts in progress	(7,349)	(7,263)
Inventories and contracts in progress, net	10,992	10,330
Capitalized research and development costs included in inventory	$ 922	$ 899