Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating Activities
Net earnings	$ 1,837	$ 1,675
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	322	322
Stock-based compensation	66	61
Deferred income taxes	79	(13)
Changes in assets and liabilities:
Accounts receivable, net	(1,115)	(830)
Inventoried costs, net	(191)	14
Prepaid expenses and other assets	(86)	(144)
Accounts payable and other liabilities	(41)	(292)
Income taxes payable	(58)	218
Retiree benefits	235	318
Other, net	(42)	(47)
Net cash provided by operating activities	1,006	1,282
Investing activities
Capital expenditures	(650)	(608)
Other, net	21	3
Net cash used in investing activities	(629)	(605)
Financing activities
Common stock repurchases	(393)	(1,149)
Payments of long-term debt	0	(107)
Cash dividends paid	(515)	(482)
Payments of employee taxes withheld from share-based awards	(91)	(152)
Other, net	(41)	(3)
Net cash used in financing activities	(1,040)	(1,893)
Decrease in cash and cash equivalents	(663)	(1,216)
Cash and cash equivalents, beginning of year	2,541	2,319
Cash and cash equivalents, end of period	$ 1,878	$ 1,103