Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020
Operating activities
Net earnings	$ 4,266	$ 5,041
Adjustments to reconcile net earnings to net cash provided by operating activities
Depreciation and amortization	999	927
Stock-based compensation	189	182
Equity method investment impairment	0	128
Tax resolution related to former IS&GS business	0	55
Pension settlement charge	1,665	0
Severance and restructuring charges	36	0
Changes in assets and liabilities
Receivables, net	(289)	(143)
Contract assets	(3,152)	(1,294)
Inventories	642	326
Accounts payable	653	247
Contract liabilities	(30)	300
Income taxes	55	58
Postretirement benefit plans	(200)	(130)
Other, net	119	679
Net cash provided by operating activities	4,953	6,376
Investing activities
Capital expenditures	(915)	(1,044)
Other, net	296	27
Net cash used for investing activities	(619)	(1,017)
Financing activities
Dividends paid	(2,178)	(2,036)
Repurchases of common stock	(2,000)	(1,100)
Issuance of long-term debt, net of related costs	0	1,131
Repayments of long-term debt	(500)	(1,150)
Other, net	(89)	(133)
Net cash used for financing activities	(4,767)	(3,288)
Net change in cash and cash equivalents	(433)	2,071
Cash and cash equivalents at beginning of period	3,160	1,514
Cash and cash equivalents at end of period	$ 2,727	$ 3,585