Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities
Net earnings	$ 2,195	$ 868
Adjustments to reconcile to net cash used in operating activities:
Depreciation and amortization	294	297
Stock-based compensation	18	18
Deferred income taxes	1	156
Gain on sale of business	(1,980)	0
Changes in assets and liabilities:
Accounts receivable, net	(253)	(810)
Unbilled receivables, net	(357)	(584)
Inventoried costs, net	(101)	(2)
Prepaid expenses and other assets	(38)	56
Accounts payable and other liabilities	(589)	(833)
Income taxes payable, net	1,028	10
Retiree benefits	(314)	(237)
Other operating activities, net	30	68
Net cash used in operating activities	(66)	(993)
Investing activities
Divestiture of IT services business	3,400	0
Capital expenditures	(205)	(272)
Other investing activities, net	1	2
Net cash provided by (used in) investing activities	3,196	(270)
Financing activities
Net proceeds from issuance of long-term debt	0	2,239
Payments of long-term debt	(2,200)	0
Payments to credit facilities	0	(7)
Net borrowings on commercial paper	0	744
Common stock repurchases	(2,000)	(344)
Cash dividends paid	(238)	(227)
Payments of employee taxes withheld from share-based awards	(30)	(63)
Other financing activities, net	(52)	(46)
Net cash (used in) provided by financing activities	(4,520)	2,296
(Decrease) increase in cash and cash equivalents	(1,390)	1,033
Cash and cash equivalents, beginning of year	4,907	2,245
Cash and cash equivalents, end of period	$ 3,517	$ 3,278