Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating activities
Net earnings	$ 3,232	$ 1,873
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	594	605
Stock-based compensation	40	36
Deferred income taxes	(121)	169
Gain on sale of business	(1,980)	0
Net periodic pension and OPB income	(546)	(408)
Pension and OPB contributions	(74)	(69)
Changes in assets and liabilities:
Accounts receivable, net	(453)	(663)
Unbilled receivables, net	(312)	(126)
Inventoried costs, net	(104)	(49)
Prepaid expenses and other assets	26	(16)
Accounts payable and other liabilities	(202)	(374)
Income taxes payable, net	881	330
Other operating activities, net	(19)	36
Net cash provided by operating activities	962	1,344
Investing activities
Divestiture of IT services business	3,400	0
Capital expenditures	(435)	(541)
Proceeds from sale of equipment to a customer	56	0
Other investing activities, net	1	2
Net cash provided by (used in) investing activities	3,022	(539)
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	(2,143)	(490)
Cash dividends paid	(486)	(469)
Payments of employee taxes withheld from share-based awards	(31)	(64)
Other financing activities, net	(54)	(48)
Net cash (used in) provided by financing activities	(4,950)	1,128
(Decrease) increase in cash and cash equivalents	(966)	1,933
Cash and cash equivalents, beginning of year	4,907	2,245
Cash and cash equivalents, end of period	$ 3,941	$ 4,178