Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities
Net earnings	$ 1,724	$ 1,629
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	479	281
Non-cash lease expense	127	0
Stock-based compensation	55	53
Deferred income taxes	48	49
Changes in assets and liabilities:
Accounts receivable, net	(384)	(145)
Unbilled receivables, net	(658)	(570)
Inventoried costs, net	(156)	(73)
Prepaid expenses and other assets	(48)	57
Accounts payable and other liabilities	(367)	(422)
Income taxes payable, net	194	186
Retiree benefits	(285)	(394)
Other, net	(35)	(13)
Net cash provided by operating activities	694	638
Investing activities
Acquisition of Orbital ATK, net of cash acquired	0	(7,657)
Capital expenditures	(536)	(504)
Other, net	1	2
Net cash used in investing activities	(535)	(8,159)
Financing activities
Payments of long-term debt	0	(1,550)
Net payments to credit facilities	(20)	(314)
Net borrowings on commercial paper	101	249
Common stock repurchases	(231)	(41)
Cash dividends paid	(435)	(407)
Payments of employee taxes withheld from share-based awards	(63)	(80)
Other, net	(2)	(22)
Net cash used in financing activities	(650)	(2,165)
Decrease in cash and cash equivalents	(491)	(9,686)
Cash and cash equivalents, beginning of year	1,579	11,225
Cash and cash equivalents, end of period	$ 1,088	$ 1,539