Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating activities
Net earnings	$ 2,657	$ 2,873
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	737	534
Non-cash lease expense	187	0
Stock-based compensation	93	82
Deferred income taxes	24	275
Changes in assets and liabilities:
Accounts receivable, net	(663)	(52)
Unbilled receivables, net	(778)	(898)
Inventoried costs, net	(156)	(102)
Prepaid expenses and other assets	(81)	(109)
Accounts payable and other liabilities	320	(125)
Income taxes payable, net	(34)	(114)
Retiree benefits	(422)	(847)
Other, net	(51)	(67)
Net cash provided by operating activities	1,833	1,450
Investing activities
Acquisition of Orbital ATK, net of cash acquired	0	(7,657)
Capital expenditures	(793)	(786)
Other, net	8	23
Net cash used in investing activities	(785)	(8,420)
Financing activities
Payments of long-term debt	(500)	(2,276)
Net payments to credit facilities	(31)	(314)
Net borrowings on commercial paper	201	499
Common stock repurchases	(444)	(209)
Cash dividends paid	(658)	(616)
Payments of employee taxes withheld from share-based awards	(63)	(84)
Other, net	(5)	(27)
Net cash used in financing activities	(1,500)	(3,027)
Decrease in cash and cash equivalents	(452)	(9,997)
Cash and cash equivalents, beginning of year	1,579	11,225
Cash and cash equivalents, end of period	$ 1,127	$ 1,228