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Supplemental Equity and Comprehensive Income (Loss) Information - AOCI Rollforward (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
AOCI Attributable to 3M, Net of Tax Roll Forward        
Balance at the beginning of the period $ 7,857 $ 13,816 $ 14,770 $ 15,117
Other comprehensive income (loss), before tax:        
Total other comprehensive income (loss), net of tax (294) (625) (53) (1,242)
Balance at the end of the period 4,731 14,156 4,731 14,156
Total Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to 3M, Net of Tax Roll Forward        
Balance at the beginning of the period (6,433) (7,362) (6,673) (6,750)
Other comprehensive income (loss), before tax:        
Amounts before reclassifications (274) (600) (88) (1,280)
Amounts reclassified out 27 82 114 287
Total other comprehensive income (loss), before tax (247) (518) 26 (993)
Tax effect (46) (105) (79) (242)
Total other comprehensive income (loss), net of tax (293) (623) (53) (1,235)
Balance at the end of the period (6,726) (7,985) (6,726) (7,985)
Cumulative Translation Adjustment        
AOCI Attributable to 3M, Net of Tax Roll Forward        
Balance at the beginning of the period (2,688) (2,814) (2,828) (1,943)
Other comprehensive income (loss), before tax:        
Amounts before reclassifications (340) (773) (232) (1,587)
Amounts reclassified out 0   39  
Total other comprehensive income (loss), before tax (340) (773) (193) (1,587)
Tax effect (24) (46) (31) (103)
Total other comprehensive income (loss), net of tax (364) (819) (224) (1,690)
Balance at the end of the period (3,052) (3,633) (3,052) (3,633)
Defined Benefit Pension and Postretirement Plans Adjustment        
AOCI Attributable to 3M, Net of Tax Roll Forward        
Balance at the beginning of the period (3,737) (4,581) (3,838) (4,753)
Other comprehensive income (loss), before tax:        
Amounts reclassified out 65 112 194 339
Total other comprehensive income (loss), before tax 65 112 194 339
Tax effect (15) (26) (43) (81)
Total other comprehensive income (loss), net of tax 50 86 151 258
Balance at the end of the period (3,687) (4,495) (3,687) (4,495)
Cash Flow Hedging Instruments, Unrealized Gain (Loss)        
AOCI Attributable to 3M, Net of Tax Roll Forward        
Balance at the beginning of the period (8) 33 (7) (54)
Other comprehensive income (loss), before tax:        
Amounts before reclassifications 66 173 144 307
Amounts reclassified out (38) (30) (119) (52)
Total other comprehensive income (loss), before tax 28 143 25 255
Tax effect (7) (33) (5) (58)
Total other comprehensive income (loss), net of tax 21 110 20 197
Balance at the end of the period $ 13 $ 143 $ 13 $ 143