Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities
Net earnings	$ 7,005	$ 3,189	$ 2,248
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	1,239	1,267	1,265
Mark-to-market pension and OPB (benefit) expense	(2,355)	1,034	1,800
Stock-based compensation	94	90	127
Deferred income taxes	603	210	(509)
Gain on sale of business	(1,980)	0	0
Net periodic pension and OPB income	(1,091)	(802)	(432)
Pension and OPB contributions	(141)	(887)	(263)
Changes in assets and liabilities:
Accounts receivable, net	(10)	(285)	122
Unbilled receivables, net	(414)	160	(335)
Inventoried costs, net	(52)	18	(135)
Prepaid expenses and other assets	66	(147)	(78)
Accounts payable and other liabilities	376	719	617
Income taxes payable, net	215	(238)	(63)
Other, net	12	(23)	(67)
Net cash provided by operating activities	3,567	4,305	4,297
Investing activities
Divestiture of IT services business	3,400	0	0
Capital expenditures	(1,415)	(1,420)	(1,264)
Proceeds from sale of equipment to a customer	84	205	0
Other investing activities, net	(11)	4	57
Net cash provided by (used in) investing activities	2,058	(1,211)	(1,207)
Financing activities
Net proceeds from issuance of long-term debt	0	2,239	0
Payments of long-term debt	(2,236)	(1,027)	(500)
Payments to credit facilities	0	(78)	(31)
Net repayments of commercial paper	0	0	(198)
Common stock repurchases	(3,705)	(490)	(744)
Cash dividends paid	(983)	(953)	(880)
Payments of employee taxes withheld from share-based awards	(34)	(66)	(65)
Other financing activities, net	(44)	(57)	(6)
Net cash used in financing activities	(7,002)	(432)	(2,424)
(Decrease) increase in cash and cash equivalents	(1,377)	2,662	666
Cash and cash equivalents, beginning of year	4,907	2,245	1,579
Cash and cash equivalents, end of year	$ 3,530	$ 4,907	$ 2,245