Consolidated Statement of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash Flows from Operating Activities
Net income including noncontrolling interest	$ 4,589	$ 4,047
Adjustments to reconcile net income including noncontrolling interest to net cash provided by operating activities
Depreciation and amortization	1,408	1,413
Company pension and postretirement contributions	(121)	(122)
Company pension and postretirement expense	137	232
Stock-based compensation expense	227	216
Gain on sale of businesses	0	(389)
Deferred income taxes	(155)	(57)
Changes in assets and liabilities
Accounts receivable	(324)	113
Inventories	(823)	43
Accounts payable	340	(48)
Accrued income taxes (current and long-term)	(41)	146
Other — net	212	4
Net cash provided by (used in) operating activities	5,449	5,598
Cash Flows from Investing Activities
Purchases of property, plant and equipment (PP&E)	(1,047)	(1,079)
Proceeds from sale of PP&E and other assets	44	29
Acquisitions, net of cash acquired	0	(25)
Purchases of marketable securities and investments	(1,810)	(1,069)
Proceeds from maturities and sale of marketable securities and investments	1,363	1,239
Proceeds from sale of businesses, net of cash sold	0	576
Other — net	18	8
Net cash provided by (used in) investing activities	(1,432)	(321)
Cash Flows from Financing Activities
Change in short-term debt — net	4	(138)
Repayment of debt (maturities greater than 90 days)	(450)	(2,477)
Proceeds from debt (maturities greater than 90 days)	1	1,745
Purchases of treasury stock	(1,261)	(366)
Proceeds from issuance of treasury stock pursuant to stock option and benefit plans	566	325
Dividends paid to shareholders	(2,572)	(2,540)
Other — net	(21)	(47)
Net cash provided by (used in) financing activities	(3,733)	(3,498)
Effect of exchange rate changes on cash and cash equivalents	(40)	(11)
Net increase (decrease) in cash and cash equivalents	244	1,768
Cash and cash equivalents at beginning of year	4,634	2,353
Cash and cash equivalents at end of period	$ 4,878	$ 4,121