Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023
Cash Flows from Operating Activities
Net income (loss) including noncontrolling interest	[1]	$ 3,460	$ (7,926)
Adjustments to reconcile net income (loss) including noncontrolling interest to net cash provided by operating activities
Depreciation and amortization	[1]	1,041	1,450
Company pension and postretirement contributions	[1]	(116)	(85)
Company pension and postretirement expense	[1]	953	113
Stock-based compensation expense	[1]	242	222
Gain on business divestitures	[1]	0	(36)
Deferred income taxes	[1]	293	(3,468)
Changes in assets and liabilities
Accounts receivable	[1]	(87)	(371)
Inventories	[1]	(172)	236
Accounts payable	[1]	8	118
Accrued income taxes (current and long-term)	[1]	(152)	(369)
Other — net	[1]	(5,469)	14,810
Net cash provided by (used in) operating activities	[1]	1	4,694
Cash Flows from Investing Activities
Purchases of property, plant and equipment (PP&E)	[1]	(890)	(1,257)
Proceeds from sale of PP&E and other assets	[1]	55	114
Purchases of marketable securities and investments	[1]	(2,220)	(1,143)
Proceeds from maturities and sale of marketable securities and investments	[1]	1,022	1,292
Proceeds from sale of businesses, net of cash sold	[1]	0	60
Other — net	[1]	(27)	28
Net cash provided by (used in) investing activities	[1]	(2,060)	(906)
Cash Flows from Financing Activities
Change in short-term debt — net	[1]	(205)	485
Repayment of debt (maturities greater than 90 days)	[1]	(2,653)	(2,434)
Proceeds from debt (maturities greater than 90 days)	[1]	8,367	2,011
Purchases of treasury stock	[1]	(1,096)	(31)
Proceeds from issuance of treasury stock pursuant to stock option and benefit plans	[1]	68	245
Dividends paid to shareholders	[1]	(1,604)	(2,483)
Cash transferred to Solventum related to separation, net	[1]	(616)	0
Other — net	[1]	(83)	(16)
Net cash provided by (used in) financing activities	[1]	2,178	(2,223)
Effect of exchange rate changes on cash and cash equivalents	[1]	(2)	(80)
Net increase (decrease) in cash and cash equivalents	[1]	117	1,485
Cash and cash equivalents at beginning of year	[1]	5,933	3,655
Cash and cash equivalents at end of period	[1]	$ 6,050	$ 5,140

[1] The Consolidated Statements of Cash Flows include the results of continuing and discontinued operations and, therefore, also include cash and cash equivalents associated with Solventum through its April 2024 separation from 3M that were presented in current assets of discontinued operations in the 3M Consolidated Balance Sheet.