Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities
Net earnings	$ 4,295	$ 2,859
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	908	922
Stock-based compensation	71	61
Deferred income taxes	(105)	369
Gain on sale of business	(1,980)	0
Net periodic pension and OPB income	(818)	(612)
Pension and OPB contributions	(108)	(100)
Changes in assets and liabilities:
Accounts receivable, net	(133)	(632)
Unbilled receivables, net	(596)	(386)
Inventoried costs, net	(113)	(70)
Prepaid expenses and other assets	6	(122)
Accounts payable and other liabilities	49	283
Income taxes payable, net	663	111
Other operating activities, net	(14)	20
Net cash provided by operating activities	2,125	2,703
Investing activities
Divestiture of IT services business	3,400	0
Capital expenditures	(682)	(828)
Proceeds from sale of equipment to a customer	84	0
Other investing activities, net	(3)	0
Net cash provided by (used in) investing activities	2,799	(828)
Financing activities
Net proceeds from issuance of long-term debt	0	2,239
Payments of long-term debt	(2,236)	(27)
Payments to credit facilities	0	(13)
Common stock repurchases	(2,724)	(490)
Cash dividends paid	(737)	(711)
Payments of employee taxes withheld from share-based awards	(33)	(66)
Other financing activities, net	(46)	(57)
Net cash (used in) provided by financing activities	(5,776)	875
(Decrease) increase in cash and cash equivalents	(852)	2,750
Cash and cash equivalents, beginning of year	4,907	2,245
Cash and cash equivalents, end of period	$ 4,055	$ 4,995