Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating activities
Net earnings	$ 1,873	$ 1,724
Adjustments to reconcile to net cash used in operating activities:
Depreciation and amortization	605	606
Stock-based compensation	36	55
Deferred income taxes	169	48
Changes in assets and liabilities:
Accounts receivable, net	(663)	(384)
Unbilled receivables, net	(126)	(658)
Inventoried costs, net	(49)	(156)
Prepaid expenses and other assets	(16)	(48)
Accounts payable and other liabilities	(374)	(367)
Income taxes payable, net	330	194
Retiree benefits	(473)	(285)
Other Noncash Income (Expense)	(32)	35
Net cash used in operating activities	1,344	694
Investing activities
Capital expenditures	(541)	(536)
Other, net	2	1
Net cash used in investing activities	(539)	(535)
Financing activities
Net proceeds from issuance of long-term debt	2,239	0
Payments to credit facilities	(13)	(20)
Net borrowings on commercial paper	0	101
Common stock repurchases	(490)	(231)
Cash dividends paid	(469)	(435)
Payments of employee taxes withheld from share-based awards	(64)	(63)
Other, net	(75)	(2)
Net cash provided by financing activities	1,128	(650)
Decrease in cash and cash equivalents	1,933	(491)
Cash and cash equivalents, beginning of year	2,245	1,579
Cash and cash equivalents, end of period	$ 4,178	$ 1,088