Segment Information (Details 5) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012 Segment	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Number of Reportable Segments									4
Sales	$ 6,476,000,000	$ 6,270,000,000	$ 6,274,000,000	$ 6,198,000,000	$ 6,506,000,000	$ 6,612,000,000	$ 6,560,000,000	$ 6,734,000,000	$ 25,218,000,000	$ 26,412,000,000	$ 28,143,000,000
Operating income	824,000,000	736,000,000	774,000,000	796,000,000	799,000,000	825,000,000	841,000,000	811,000,000	3,130,000,000	3,276,000,000	2,827,000,000
Net pension adjustment									132,000,000	400,000,000	10,000,000
U.S. Government
Segment Reporting Information [Line Items]
Sales									22,700,000,000	23,900,000,000	25,500,000,000
Percentage of total sales									90.00%	90.50%	90.60%
Direct Foreign
Segment Reporting Information [Line Items]
Sales									1,600,000,000	1,600,000,000	1,600,000,000
Percentage of total sales									6.00%	6.00%	6.00%
Transferred from Aerospace Systems to Technical Services
Segment Reporting Information [Line Items]
Sales										494,000,000	474,000,000
Operating income										$ 44,000,000	$ 43,000,000