Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash received from customers
Collections on billings	$ 4,582	$ 4,921
Progress payments	1,213	1,021
Other cash receipts	27	27
Total sources of cash	5,822	5,969
Uses of cash
Cash paid to suppliers and employees	(5,649)	(5,858)
Pension Contributions	(26)	(17)
Interest paid, net of interest received	(80)	(78)
Income taxes paid, net of refunds received	(26)	(92)
Other cash payments	(40)	(29)
Total uses of cash	5,821	6,074
Net cash provided by (used in) operating activities	1	(105)
Investing activities
Capital expenditures	(40)	(81)
Maturities of short-term investments	0	250
Other investing activities, net	2	0
Net cash (used in) provided by investing activities	(38)	169
Financing activities
Common stock repurchases	(456)	(263)
Cash dividends paid	(130)	(127)
Proceeds from exercises of stock options	17	40
Other financing activities, net	(73)	(34)
Net cash used in financing activities	(642)	(384)
Decrease in cash and cash equivalents	(679)	(320)
Cash and cash equivalents, beginning of year	3,862	3,002
Cash and cash equivalents, end of period	$ 3,183	$ 2,682