Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019
Operating activities
Net earnings	$ 3,343	$ 3,124
Adjustments to reconcile net earnings to net cash provided by operating activities
Depreciation and amortization	608	565
Stock-based compensation	115	104
Equity method investment impairment	128	0
Gain on property sale	0	(51)
Changes in assets and liabilities
Receivables, net	(498)	(102)
Contract assets	(727)	(916)
Inventories	98	(602)
Accounts payable	191	237
Contract liabilities	427	275
Postretirement benefit plans	(77)	552
Income taxes	473	112
Other, net	415	33
Net cash provided by operating activities	4,496	3,331
Investing activities
Capital expenditures	(636)	(533)
Other, net	4	25
Net cash used for investing activities	(632)	(508)
Financing activities
Dividends paid	(1,364)	(1,260)
Repurchases of common stock	(1,015)	(500)
Issuance of long-term debt, net of related costs	1,131	0
Repayments of current and long-term debt	(1,150)	0
Repayments of commercial paper, net	0	(600)
Other, net	(125)	(68)
Net cash used for financing activities	(2,523)	(2,428)
Net change in cash and cash equivalents	1,341	395
Cash and cash equivalents at beginning of period	1,514	772
Cash and cash equivalents at end of period	$ 2,855	$ 1,167