Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash received from customers
Collections on billings	$ 13,871	$ 15,632
Progress payments	4,281	3,233
Other cash receipts	66	67
Total sources of cash	18,218	18,932
Uses of cash
Cash paid to suppliers and employees	(15,555)	(16,015)
Pension Contributions	(561)	(349)
Interest paid, net of interest received	(183)	(177)
Income taxes paid, net of refunds received	(579)	(760)
Other cash payments	(61)	(48)
Total uses of cash	(16,939)	(17,349)
Net cash provided by operating activities	1,279	1,583
Investing activities
Capital expenditures	(178)	(196)
Maturities of short-term investments	0	250
Other investing activities, net	9	7
Net cash (used in) provided by investing activities	(169)	61
Financing activities
Net proceeds from issuance of long-term debt	2,841	0
Common stock repurchases	(1,661)	(846)
Payments of long-term debt	(877)	0
Cash dividends paid	(411)	(401)
Proceeds from exercises of stock options	158	153
Other financing activities, net	(78)	(27)
Net cash used in financing activities	(28)	(1,121)
Increase in cash and cash equivalents	1,082	523
Cash and cash equivalents, beginning of year	3,862	3,002
Cash and cash equivalents, end of period	$ 4,944	$ 3,525