v3.26.1
Supplemental Equity and Comprehensive Income Information - Schedule of AOCI Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
AOCI Attributable to 3M, Net of Tax Roll Forward        
Balance at the beginning of the period $ 3,311 $ 4,523 $ 4,747 $ 3,894
Other comprehensive income (loss), before tax:        
Total other comprehensive income (loss), net of tax 46 305 13 505
Solventum spin-off   (3)   (3)
Balance at the end of the period 3,005 4,351 3,005 4,351
Total accumulated other comprehensive income (loss)        
AOCI Attributable to 3M, Net of Tax Roll Forward        
Balance at the beginning of the period (5,099) (5,531) (5,069) (5,731)
Other comprehensive income (loss), before tax:        
Amounts before reclassifications (14) 189 (68) 324
Amounts reclassified out 69 57 140 110
Total other comprehensive income (loss), before tax 55 246 72 434
Tax effect (9) 59 (56) 71
Total other comprehensive income (loss), net of tax 46 305 16 505
Solventum spin-off   11   11
Balance at the end of the period (5,053) (5,215) (5,053) (5,215)
Cumulative translation adjustment        
AOCI Attributable to 3M, Net of Tax Roll Forward        
Balance at the beginning of the period (2,612) (2,782) (2,520) (2,953)
Other comprehensive income (loss), before tax:        
Amounts before reclassifications (9) 287 (76) 436
Amounts reclassified out 0 0 0 0
Total other comprehensive income (loss), before tax (9) 287 (76) 436
Tax effect 7 52 (18) 74
Total other comprehensive income (loss), net of tax (2) 339 (94) 510
Solventum spin-off   0   0
Balance at the end of the period (2,614) (2,443) (2,614) (2,443)
Defined benefit pension and postretirement plans adjustment        
AOCI Attributable to 3M, Net of Tax Roll Forward        
Balance at the beginning of the period (2,404) (2,705) (2,451) (2,763)
Other comprehensive income (loss), before tax:        
Amounts before reclassifications 0 (7) 0 (7)
Amounts reclassified out 62 71 125 147
Total other comprehensive income (loss), before tax 62 64 125 140
Tax effect (15) (15) (31) (33)
Total other comprehensive income (loss), net of tax 47 49 94 107
Solventum spin-off   11   11
Balance at the end of the period (2,357) (2,645) (2,357) (2,645)
Cash flow hedging instruments, unrealized gain (loss)        
AOCI Attributable to 3M, Net of Tax Roll Forward        
Balance at the beginning of the period (83) (44) (98) (15)
Other comprehensive income (loss), before tax:        
Amounts before reclassifications (5) (91) 8 (105)
Amounts reclassified out 7 (14) 15 (37)
Total other comprehensive income (loss), before tax 2 (105) 23 (142)
Tax effect (1) 22 (7) 30
Total other comprehensive income (loss), net of tax 1 (83) 16 (112)
Solventum spin-off   0   0
Balance at the end of the period $ (82) $ (127) $ (82) $ (127)