Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash received from customers
Collections on billings	$ 9,558	$ 9,911
Progress payments	2,554	2,553
Other cash receipts	32	38
Total sources of cash	12,144	12,502
Uses of cash
Cash paid to suppliers and employees	(10,702)	(10,969)
Pension Contributions	(543)	(33)
Interest paid, net of interest received	(111)	(102)
Income taxes paid, net of refunds received	(412)	(584)
Other cash payments	(47)	(43)
Total uses of cash	(11,815)	(11,731)
Net cash provided by operating activities	329	771
Investing activities
Capital expenditures	(88)	(132)
Maturities of short-term investments	0	250
Other investing activities, net	6	44
Net cash (used in) provided by investing activities	(82)	162
Financing activities
Net proceeds from issuance of long-term debt	2,841	0
Common stock repurchases	(921)	(555)
Payments of long-term debt	(877)	0
Cash dividends paid	(272)	(265)
Proceeds from exercises of stock options	110	67
Other financing activities, net	(86)	(34)
Net cash provided by (used in) financing activities	795	(787)
Increase in cash and cash equivalents	1,042	146
Cash and cash equivalents, beginning of year	3,862	3,002
Cash and cash equivalents, end of period	$ 4,904	$ 3,148