v3.26.1
ACCUMULATED OTHER COMPREHENSIVE LOSS (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 Parent, Net of Tax [Roll Forward]        
Beginning balance $ 13,372 $ 11,971 $ 13,408 $ 11,308
Other comprehensive (loss) income before reclassifications        
Before-tax amount 32 178 (106) 238
Tax benefit (expense) 0 21 3 43
After-tax amount 32 199 (103) 281
Amounts reclassified from accumulated other comprehensive income (loss) 7 2 15 1
Net current period other comprehensive income (loss) 39 201 (88) 282
Ending balance 13,906 12,873 13,906 12,873
Total attributable to Cummins Inc.        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (2,377) (2,366) (2,278) (2,445)
Other comprehensive (loss) income before reclassifications        
Before-tax amount 30 176 (80) 234
Tax benefit (expense) 0 21 3 43
After-tax amount 30 197 (77) 277
Amounts reclassified from accumulated other comprehensive income (loss) 7 2 15 1
Net current period other comprehensive income (loss) 37 199 (62) 278
Ending balance (2,340) (2,167) (2,340) (2,167)
Change in pension and OPEB plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (927) (870) (912) (843)
Other comprehensive (loss) income before reclassifications        
Before-tax amount (1) 0 (32) (44)
Tax benefit (expense) 0 0 7 10
After-tax amount (1) 0 (25) (34)
Amounts reclassified from accumulated other comprehensive income (loss) 9 7 18 14
Net current period other comprehensive income (loss) 8 7 (7) (20)
Ending balance (919) (863) (919) (863)
Foreign currency translation adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (1,541) (1,602) (1,460) (1,717)
Other comprehensive (loss) income before reclassifications        
Before-tax amount 18 173 (58) 277
Tax benefit (expense) 3 22 (2) 33
After-tax amount 21 195 (60) 310
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 0 0
Net current period other comprehensive income (loss) 21 195 (60) 310
Ending balance (1,520) (1,407) (1,520) (1,407)
Unrealized gain (loss) on derivatives        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 91 106 94 115
Other comprehensive (loss) income before reclassifications        
Before-tax amount 13 3 10 1
Tax benefit (expense) (3) (1) (2) 0
After-tax amount 10 2 8 1
Amounts reclassified from accumulated other comprehensive income (loss) (2) (5) (3) (13)
Net current period other comprehensive income (loss) 8 (3) 5 (12)
Ending balance 99 103 99 103
Noncontrolling interests        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 1,021 1,047 1,059 1,037
Other comprehensive (loss) income before reclassifications        
Before-tax amount 2 2 (26) 4
Tax benefit (expense) 0 0 0 0
After-tax amount 2 2 (26) 4
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 0  
Net current period other comprehensive income (loss) 2 2 (26) 4
Ending balance $ 1,059 $ 1,084 $ 1,059 $ 1,084