Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities
Net earnings	$ 2,069	$ 1,952	$ 1,978
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	462	495	510
Stock-based compensation	134	144	183
Excess tax benefits from stock-based compensation	(81)	(43)	(45)
Deferred income taxes	216	128	78
Changes in assets and liabilities:
Accounts receivable, net	(105)	171	90
Inventoried costs, net	(24)	101	46
Prepaid expenses and other assets	13	(51)	(65)
Accounts payable and other liabilities	(89)	(169)	23
Income taxes payable	84	2	(75)
Retiree benefits	(17)	(281)	(71)
Other, net	(69)	34	(12)
Net cash provided by operating activities	2,593	2,483	2,640
Investing activities
Capital expenditures	(561)	(364)	(331)
Maturities of short-term investments	0	0	250
Other investing activities, net	(84)	18	(3)
Net cash used in investing activities	(645)	(346)	(84)
Financing activities
Common stock repurchases	(2,668)	(2,371)	(1,316)
Cash dividends paid	(563)	(545)	(535)
Net proceeds from issuance of long-term debt	0	2,841	0
Payments of long-term debt	0	(877)	0
Other financing activities, net	(4)	103	155
Net cash used in financing activities	(3,235)	(849)	(1,696)
(Decrease) increase in cash and cash equivalents	(1,287)	1,288	860
Cash and cash equivalents, beginning of year	5,150	3,862	3,002
Cash and cash equivalents, end of year	$ 3,863	$ 5,150	$ 3,862