Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Net earnings	$ 4,896	$ 7,005	$ 3,189
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	1,342	1,239	1,267
Mark-to-market pension and OPB (benefit) expense	(1,232)	(2,355)	1,034
Stock-based compensation	99	94	90
Deferred income taxes	(321)	603	210
Gain on sale of business	0	(1,980)	0
Net periodic pension and OPB income	(1,193)	(1,091)	(802)
Pension and OPB contributions	(136)	(141)	(887)
Changes in assets and liabilities:
Accounts receivable, net	(44)	(10)	(285)
Unbilled receivables, net	(646)	(414)	160
Inventoried costs, net	(205)	(52)	18
Prepaid expenses and other assets	2	66	(147)
Accounts payable and other liabilities	572	376	719
Income taxes payable, net	(279)	215	(238)
Other, net	46	12	(23)
Net cash provided by operating activities	2,901	3,567	4,305
Investing activities
Divestiture of IT services business	0	3,400	0
Capital expenditures	(1,435)	(1,415)	(1,420)
Proceeds from sale of equipment to a customer	155	84	205
Other, net	39	(11)	4
Net cash (used in) provided by investing activities	(1,241)	2,058	(1,211)
Financing activities
Net proceeds from issuance of long-term debt	0	0	2,239
Payments of long-term debt	0	(2,236)	(1,027)
Payments to credit facilities	0	0	(78)
Common stock repurchases	(1,504)	(3,705)	(490)
Cash dividends paid	(1,052)	(983)	(953)
Payments of employee taxes withheld from share-based awards	(50)	(34)	(66)
Other, net	(7)	(44)	(57)
Net cash used in financing activities	(2,613)	(7,002)	(432)
(Decrease) increase in cash and cash equivalents	(953)	(1,377)	2,662
Cash and cash equivalents, beginning of year	3,530	4,907	2,245
Cash and cash equivalents, end of year	$ 2,577	$ 3,530	$ 4,907