v3.25.4
Supplemental Equity and Comprehensive Income Information - Schedule of AOCI Rollforward (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
AOCI Attributable to 3M, Net of Tax Roll Forward      
Balance at the beginning of the period $ 3,894 $ 4,868 $ 14,770
Other comprehensive income (loss), before tax:      
Total other comprehensive income (loss), net of tax 648 462 (105)
Solventum spin-off (3) (2,167)  
Balance at the end of the period 4,747 3,894 4,868
Total accumulated other comprehensive income (loss)      
AOCI Attributable to 3M, Net of Tax Roll Forward      
Balance at the beginning of the period (5,731) (6,778) (6,673)
Other comprehensive income (loss), before tax:      
Amounts before reclassifications 358 (312) (405)
Amounts reclassified out 276 1,087 163
Total other comprehensive income (loss), before tax 634 775 (242)
Tax effect 17 (312) 137
Total other comprehensive income (loss), net of tax 651 463 (105)
Solventum spin-off 11 584  
Balance at the end of the period (5,069) (5,731) (6,778)
Cumulative translation adjustment      
AOCI Attributable to 3M, Net of Tax Roll Forward      
Balance at the beginning of the period (2,953) (2,506) (2,828)
Other comprehensive income (loss), before tax:      
Amounts before reclassifications 347 (563) 277
Amounts reclassified out 0 38 54
Total other comprehensive income (loss), before tax 347 (525) 331
Tax effect 86 14 (9)
Total other comprehensive income (loss), net of tax 433 (511) 322
Solventum spin-off 0 64  
Balance at the end of the period (2,520) (2,953) (2,506)
Defined benefit pension and postretirement plans adjustment      
AOCI Attributable to 3M, Net of Tax Roll Forward      
Balance at the beginning of the period (2,763) (4,218) (3,838)
Other comprehensive income (loss), before tax:      
Amounts before reclassifications 88 123 (763)
Amounts reclassified out 304 1,127 252
Total other comprehensive income (loss), before tax 392 1,250 (511)
Tax effect (91) (315) 131
Total other comprehensive income (loss), net of tax 301 935 (380)
Solventum spin-off 11 520  
Balance at the end of the period (2,451) (2,763) (4,218)
Cash flow hedging instruments      
AOCI Attributable to 3M, Net of Tax Roll Forward      
Balance at the beginning of the period (15) (54) (7)
Other comprehensive income (loss), before tax:      
Amounts before reclassifications (77) 128 81
Amounts reclassified out (28) (78) (143)
Total other comprehensive income (loss), before tax (105) 50 (62)
Tax effect 22 (11) 15
Total other comprehensive income (loss), net of tax (83) 39 (47)
Solventum spin-off 0 0  
Balance at the end of the period $ (98) $ (15) $ (54)