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STOCKHOLDERS' EQUITY - Schedule of Stockholders Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (in shares)     355,100,000  
Beginning balance $ 18,297.7 $ 17,953.1 $ 17,941.7 $ 16,529.6
Issuance of common stock through employee stock plans 96.4 90.0 283.8 273.7
Shares withheld related to net share settlement of equity awards (13.1) (19.7) (378.5) (406.0)
Share-based compensation expense related to employee stock plans 217.6 205.4 644.4 589.9
Repurchase and retirement of common stock (2,939.8) (1,919.6) (4,446.3) (2,100.6)
Net income attributable to Intuitive Surgical, Inc. 522.8 704.4 2,162.4 2,061.2
Other comprehensive income (loss) (65.4) 23.7 (100.9) 78.4
Net income attributable to noncontrolling interest in joint venture $ 1.6 4.8 $ 11.2 15.9
Ending balance (in shares) 346,600,000   346,600,000  
Ending balance $ 16,117.8 17,042.1 $ 16,117.8 17,042.1
Total Intuitive Surgical, Inc. Stockholders’ Equity        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 18,168.4 17,845.7 17,824.0 16,433.7
Issuance of common stock through employee stock plans 96.4 90.0 283.8 273.7
Shares withheld related to net share settlement of equity awards (13.1) (19.7) (378.5) (406.0)
Share-based compensation expense related to employee stock plans 217.6 205.4 644.4 589.9
Repurchase and retirement of common stock (2,939.8) (1,919.6) (4,446.3) (2,100.6)
Net income attributable to Intuitive Surgical, Inc. 522.8 704.4 2,162.4 2,061.2
Other comprehensive income (loss) (66.1) 23.5 (103.6) 77.8
Ending balance $ 15,986.2 $ 16,929.7 $ 15,986.2 $ 16,929.7
Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (in shares) 353,900,000 358,400,000 355,100,000 356,600,000
Beginning balance $ 0.4 $ 0.4 $ 0.4 $ 0.4
Issuance of common stock through employee stock plans (in shares) 600,000 500,000 3,300,000 3,400,000
Shares withheld related to net share settlement of equity awards (in shares) (100,000) 0 (800,000) (700,000)
Repurchase and retirement of common stock (in shares) (7,800,000) (4,000,000.0) (11,000,000.0) (4,400,000)
Repurchase and retirement of common stock $ (0.1)   $ (0.1)  
Ending balance (in shares) 346,600,000 354,900,000 346,600,000 354,900,000
Ending balance $ 0.3 $ 0.4 $ 0.3 $ 0.4
Additional Paid-In Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 11,325.0 10,236.8 10,768.5 9,681.3
Issuance of common stock through employee stock plans 96.4 90.0 283.8 273.7
Shares withheld related to net share settlement of equity awards (0.5) (0.5) (11.2) (8.7)
Share-based compensation expense related to employee stock plans 217.6 205.4 644.4 589.9
Repurchase and retirement of common stock (117.4) (52.9) (164.4) (57.4)
Ending balance 11,521.1 10,478.8 11,521.1 10,478.8
Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 6,837.2 7,605.5 7,011.8 6,803.3
Shares withheld related to net share settlement of equity awards (12.6) (19.2) (367.3) (397.3)
Repurchase and retirement of common stock (2,822.3) (1,866.7) (4,281.8) (2,043.2)
Net income attributable to Intuitive Surgical, Inc. 522.8 704.4 2,162.4 2,061.2
Ending balance 4,525.1 6,424.0 4,525.1 6,424.0
Accumulated Other Comprehensive Income (Loss)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 5.8 3.0 43.3 (51.3)
Other comprehensive income (loss) (66.1) 23.5 (103.6) 77.8
Ending balance (60.3) 26.5 (60.3) 26.5
Noncontrolling Interest in Joint Venture        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 129.3 107.4 117.7 95.9
Other comprehensive income (loss) 0.7 0.2 2.7 0.6
Net income attributable to noncontrolling interest in joint venture 1.6 4.8 11.2 15.9
Ending balance $ 131.6 $ 112.4 $ 131.6 $ 112.4