v3.26.3
Supplemental Equity, Redeemable Noncontrolling Interest, and Comprehensive Income Information - Schedule of AOCI Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
AOCI Attributable to 3M, Net of Tax Roll Forward        
Balance at the beginning of the period $ 3,005 $ 4,351 $ 4,747 $ 3,894
Other comprehensive income (loss), before tax:        
Total other comprehensive income (loss), net of tax 64 89 77 594
Solventum spin-off       (3)
Balance at the end of the period 4,169 4,675 4,169 4,675
AOCI        
AOCI Attributable to 3M, Net of Tax Roll Forward        
Balance at the beginning of the period (5,053) (5,215) (5,069) (5,731)
Other comprehensive income (loss), before tax:        
Amounts before reclassifications 17 70 (51) 394
Amounts reclassified out 68 75 208 185
Total other comprehensive income (loss), before tax 85 145 157 579
Tax effect (15) (52) (71) 19
Total other comprehensive income (loss), net of tax 70 93 86 598
Solventum spin-off       11
Balance at the end of the period (4,983) (5,122) (4,983) (5,122)
Cumulative translation adjustment        
AOCI Attributable to 3M, Net of Tax Roll Forward        
Balance at the beginning of the period (2,614) (2,443) (2,520) (2,953)
Other comprehensive income (loss), before tax:        
Amounts before reclassifications 43 (64) (33) 372
Amounts reclassified out 0 0 0 0
Total other comprehensive income (loss), before tax 43 (64) (33) 372
Tax effect (4) (3) (22) 71
Total other comprehensive income (loss), net of tax 39 (67) (55) 443
Solventum spin-off       0
Balance at the end of the period (2,575) (2,510) (2,575) (2,510)
Defined benefit pension and postretirement plans adjustment        
AOCI Attributable to 3M, Net of Tax Roll Forward        
Balance at the beginning of the period (2,357) (2,645) (2,451) (2,763)
Other comprehensive income (loss), before tax:        
Amounts before reclassifications 0 111 0 104
Amounts reclassified out 64 71 189 218
Total other comprehensive income (loss), before tax 64 182 189 322
Tax effect (16) (43) (47) (76)
Total other comprehensive income (loss), net of tax 48 139 142 246
Solventum spin-off       11
Balance at the end of the period (2,309) (2,506) (2,309) (2,506)
Cash flow hedging instruments, unrealized gain (loss)        
AOCI Attributable to 3M, Net of Tax Roll Forward        
Balance at the beginning of the period (82) (127) (98) (15)
Other comprehensive income (loss), before tax:        
Amounts before reclassifications (26) 23 (18) (82)
Amounts reclassified out 4 4 19 (33)
Total other comprehensive income (loss), before tax (22) 27 1 (115)
Tax effect 5 (6) (2) 24
Total other comprehensive income (loss), net of tax (17) 21 (1) (91)
Solventum spin-off       0
Balance at the end of the period $ (99) $ (106) $ (99) $ (106)