v3.25.4
Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2025
Feb. 10, 2026
Jun. 30, 2025
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Entity File Number 1-2360    
Entity Registrant Name INTERNATIONAL BUSINESS MACHINES CORPORATION    
Entity Incorporation, State or Country Code NY    
Entity Address, Address Line One One New Orchard Road    
Entity Address, City or Town Armonk    
Entity Address, State or Province NY    
Entity Tax Identification Number 13-0871985    
Entity Address, Postal Zip Code 10504    
City Area Code 914    
Local Phone Number 499-1900    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 274.5
Entity Common Stock, Shares Outstanding   938,034,404  
Documents Incorporated by Reference
Portions of IBM’s Annual Report to Stockholders for the year ended December 31, 2025 are incorporated by reference into Parts I, II and IV of this Form 10-K.
Portions of IBM’s definitive Proxy Statement to be filed with the Securities and Exchange Commission and delivered to stockholders in connection with the Annual Meeting of Stockholders to be held April 28, 2026 are incorporated by reference into Part III of this Form 10-K.
    
Entity Central Index Key 0000051143    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false    
NEW YORK STOCK EXCHANGE, INC. | Common Stock      
Document Information [Line Items]      
Title of 12(b) Security Capital stock, par value $.20 per share    
Trading Symbol IBM    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 0.300% Notes due 2026      
Document Information [Line Items]      
Title of 12(b) Security 0.300% Notes due 2026    
Trading Symbol IBM 26B    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 1.250% Notes due 2027      
Document Information [Line Items]      
Title of 12(b) Security 1.250% Notes due 2027    
Trading Symbol IBM 27B    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 3.375% Notes due 2027      
Document Information [Line Items]      
Title of 12(b) Security 3.375% Notes due 2027    
Trading Symbol IBM 27F    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 0.300% Notes due 2028      
Document Information [Line Items]      
Title of 12(b) Security 0.300% Notes due 2028    
Trading Symbol IBM 28B    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 1.750% Notes due 2028      
Document Information [Line Items]      
Title of 12(b) Security 1.750% Notes due 2028    
Trading Symbol IBM 28A    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 1.500% Notes due 2029      
Document Information [Line Items]      
Title of 12(b) Security 1.500% Notes due 2029    
Trading Symbol IBM 29    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 0.875% Notes due 2030      
Document Information [Line Items]      
Title of 12(b) Security 0.875% Notes due 2030    
Trading Symbol IBM 30A    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 2.900% Notes due 2030      
Document Information [Line Items]      
Title of 12(b) Security 2.900% Notes due 2030    
Trading Symbol IBM 30C    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 1.750% Notes due 2031      
Document Information [Line Items]      
Title of 12(b) Security 1.750% Notes due 2031    
Trading Symbol IBM 31    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 3.000% Notes due 2031      
Document Information [Line Items]      
Title of 12(b) Security 3.000% Notes due 2031    
Trading Symbol IBM 31A    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 3.625% Notes due 2031      
Document Information [Line Items]      
Title of 12(b) Security 3.625% Notes due 2031    
Trading Symbol IBM 31B    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 0.650% Notes due 2032      
Document Information [Line Items]      
Title of 12(b) Security 0.650% Notes due 2032    
Trading Symbol IBM 32A    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 3.150% Notes due 2033      
Document Information [Line Items]      
Title of 12(b) Security 3.150% Notes due 2033    
Trading Symbol IBM 33A    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 3.450% Notes due 2034      
Document Information [Line Items]      
Title of 12(b) Security 3.450% Notes due 2034    
Trading Symbol IBM 34A    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 1.250% Notes due 2034      
Document Information [Line Items]      
Title of 12(b) Security 1.250% Notes due 2034    
Trading Symbol IBM 34    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 3.750% Notes due 2035      
Document Information [Line Items]      
Title of 12(b) Security 3.750% Notes due 2035    
Trading Symbol IBM 35    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 3.450% Notes due 2037      
Document Information [Line Items]      
Title of 12(b) Security 3.450% Notes due 2037    
Trading Symbol IBM 37    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 3.850% Notes due 2038      
Document Information [Line Items]      
Title of 12(b) Security 3.850% Notes due 2038    
Trading Symbol IBM 38B    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 4.875% Notes due 2038      
Document Information [Line Items]      
Title of 12(b) Security 4.875% Notes due 2038    
Trading Symbol IBM 38    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 1.200% Notes due 2040      
Document Information [Line Items]      
Title of 12(b) Security 1.200% Notes due 2040    
Trading Symbol IBM 40    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 4.000% Notes due 2043      
Document Information [Line Items]      
Title of 12(b) Security 4.000% Notes due 2043    
Trading Symbol IBM 43    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 3.800% Notes due 2045      
Document Information [Line Items]      
Title of 12(b) Security 3.800% Notes due 2045    
Trading Symbol IBM 45A    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | Floating Rate Notes due 2028      
Document Information [Line Items]      
Title of 12(b) Security Floating Rate Notes due 2028    
Trading Symbol IBM 28E    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 6.22% Debentures due 2027      
Document Information [Line Items]      
Title of 12(b) Security 6.22% Debentures due 2027    
Trading Symbol IBM 27    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 6.50% Debentures due 2028      
Document Information [Line Items]      
Title of 12(b) Security 6.50% Debentures due 2028    
Trading Symbol IBM 28    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 5.875% Debentures due 2032      
Document Information [Line Items]      
Title of 12(b) Security 5.875% Debentures due 2032    
Trading Symbol IBM 32D    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 7.00% Debentures due 2045      
Document Information [Line Items]      
Title of 12(b) Security 7.00% Debentures due 2045    
Trading Symbol IBM 45    
Security Exchange Name NYSE    
NEW YORK STOCK EXCHANGE, INC. | 7.125% Debentures due 2096      
Document Information [Line Items]      
Title of 12(b) Security 7.125% Debentures due 2096    
Trading Symbol IBM 96    
Security Exchange Name NYSE    
NYSE CHICAGO, INC. | Common Stock      
Document Information [Line Items]      
Title of 12(b) Security Capital stock, par value $.20 per share    
Trading Symbol IBM    
Security Exchange Name CHX