Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating Activities
Net earnings	$ 1,428	$ 1,205
Adjustments to reconcile to net cash (used in) provided by operating activities:
Depreciation and amortization	281	213
Stock-based compensation	53	42
Deferred income taxes	(17)	(39)
Changes in assets and liabilities:
Accounts receivable, net	(145)	(509)
Unbilled receivables, net	(570)	(793)
Inventoried costs, net	(73)	(54)
Prepaid expenses and other assets	57	(34)
Accounts payable and other liabilities	(422)	(172)
Income taxes payable	186	90
Retiree benefits	(127)	165
Other, net	(13)	(46)
Net cash provided by operating activities	638	68
Investing activities
Acquisition of Orbital ATK, net of cash acquired	(7,657)	0
Capital expenditures	(504)	(433)
Other, net	2	7
Net cash used in investing activities	(8,159)	(426)
Financing activities
Payments of long-term debt	(1,550)	0
Payments to credit facilities	(314)	0
Net borrowings on commercial paper	249	0
Common stock repurchases	(41)	(367)
Cash dividends paid	(407)	(341)
Payments of employee taxes withheld from share-based awards	(80)	(91)
Other, net	(22)	(1)
Net cash used in financing activities	(2,165)	(800)
Decrease in cash and cash equivalents	(9,686)	(1,158)
Cash and cash equivalents, beginning of year	11,225	2,541
Cash and cash equivalents, end of period	$ 1,539	$ 1,383