Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating activities
Net earnings	$ 2,859	$ 2,657
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	922	924
Stock-based compensation	61	93
Deferred income taxes	369	24
Changes in assets and liabilities:
Accounts receivable, net	(632)	(663)
Unbilled receivables, net	(386)	(778)
Inventoried costs, net	(70)	(156)
Prepaid expenses and other assets	(122)	(81)
Accounts payable and other liabilities	283	320
Income taxes payable, net	111	(34)
Retiree benefits	(704)	(422)
Other, net	12	(51)
Net cash provided by operating activities	2,703	1,833
Investing activities
Capital expenditures	(828)	(793)
Other, net	0	8
Net cash used in investing activities	(828)	(785)
Financing activities
Net proceeds from issuance of long-term debt	2,239	0
Payments of long-term debt	(27)	(500)
Payments to credit facilities	(13)	(31)
Net borrowings on commercial paper	0	201
Common stock repurchases	(490)	(444)
Cash dividends paid	(711)	(658)
Payments of employee taxes withheld from share-based awards	(66)	(63)
Other, net	(57)	(5)
Net cash provided by (used in) financing activities	875	(1,500)
Increase (decrease) in cash and cash equivalents	2,750	(452)
Cash and cash equivalents, beginning of year	2,245	1,579
Cash and cash equivalents, end of period	$ 4,995	$ 1,127