Segment Information (Details 5) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Sales	$ 6,157	$ 6,106	$ 6,294	$ 6,104	$ 6,476	$ 6,270	$ 6,274	$ 6,198	$ 24,661	$ 25,218	$ 26,412
U.S. Government
Segment Reporting Information [Line Items]
Sales									21,300	22,300	23,400
Percentage of total sales									86.00%	88.00%	89.00%
Direct Foreign
Segment Reporting Information [Line Items]
Sales									$ 2,500	$ 2,100	$ 2,100
Percentage of total sales									10.00%	8.00%	8.00%