Inventories and Contracts in Progress (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Notes to Condensed Consolidated Financial Statements [Abstract]
Raw materials	$ 1,967	$ 1,861
Work-in-process	4,864	4,151
Finished goods	3,556	3,205
Contracts in progress	8,038	7,354
Inventory before payments and billings	18,425	16,571
Progress payments, secured by lien, on U.S. Government contracts	(379)	(274)
Billings on contracts in progress	(7,281)	(6,760)
Inventories and contracts in progress, net	10,765	9,537
Capitalized research and development costs included in inventory	$ 866	$ 823