v3.26.1
Financing (Narrative) (Details)
€ in Millions, SFr in Millions
6 Months Ended
Jun. 03, 2026
USD ($)
Jun. 03, 2026
CHF (SFr)
Apr. 23, 2026
EUR (€)
Apr. 23, 2026
USD ($)
Apr. 16, 2026
USD ($)
Jun. 26, 2026
EUR (€)
Jun. 26, 2026
USD ($)
Mar. 18, 2026
EUR (€)
Dec. 31, 2025
EUR (€)
Dec. 31, 2025
USD ($)
Debt Instrument [Line Items]                    
Debt discounts, premiums and debt issuance costs             $ 130,000,000     $ 93,000,000
Borrowings outstanding             25,147,000,000     18,416,000,000
Borrowings outstanding             26,558,000,000     18,418,000,000
Multi-year Credit Facility | Revolving credit facility | Line of credit                    
Debt Instrument [Line Items]                    
Line of credit facility             5,000,000,000.0      
Borrowings outstanding             0      
Euro-denominated commercial paper                    
Debt Instrument [Line Items]                    
Borrowings outstanding             $ 4,700,000,000      
Euro-denominated commercial paper | Commercial paper                    
Debt Instrument [Line Items]                    
Weighted average interest rate of long-term debt, interest rate           2.50% 2.50%      
Weighted average maturity of long-term debt, at point in time           79 days        
Borrowings outstanding           € 4,100 $ 4,703,000,000   € 933 1,097,000,000
U.S. dollar-denominated commercial paper | Commercial paper                    
Debt Instrument [Line Items]                    
Borrowings outstanding             0      
364-Day Facility | Revolving credit facility                    
Debt Instrument [Line Items]                    
Line of credit facility         $ 5,000,000,000.0          
Borrowings outstanding             0      
Debt term         364 days          
Debt conversion fee equal to amount of principal outstanding, percentage         0.50%          
Commitment fee percentage         0.04%          
Consolidated Leverage Ratio to be maintained         0.65          
364-Day Facility | Revolving credit facility | Debt Rate, Condition Two                    
Debt Instrument [Line Items]                    
Debt instrument, basis spread on variable rate         1.00%          
364-Day Facility | Revolving credit facility | Fed funds rate                    
Debt Instrument [Line Items]                    
Debt instrument, basis spread on variable rate         0.05%          
364-Day Facility | Revolving credit facility | Secured Overnight Financing Rate (SOFR) | Debt Rate, Condition One                    
Debt Instrument [Line Items]                    
Debt instrument, basis spread on variable rate         1.00%          
364-Day Facility | Revolving credit facility | Minimum | Debt Rate, Condition Two                    
Debt Instrument [Line Items]                    
Debt instrument, basis spread on variable rate         0.00%          
364-Day Facility | Revolving credit facility | Minimum | Secured Overnight Financing Rate (SOFR)                    
Debt Instrument [Line Items]                    
Debt instrument, basis spread on variable rate         0.585%          
364-Day Facility | Revolving credit facility | Maximum | Debt Rate, Condition Two                    
Debt Instrument [Line Items]                    
Debt instrument, basis spread on variable rate         0.085%          
364-Day Facility | Revolving credit facility | Maximum | Secured Overnight Financing Rate (SOFR)                    
Debt Instrument [Line Items]                    
Debt instrument, basis spread on variable rate         1.085%          
2026 Biopharma Euronotes | Senior notes                    
Debt Instrument [Line Items]                    
Borrowings outstanding             $ 0     $ 1,469,000,000
Aggregate principal amount | €           € 1,300   € 1,300 € 1,300  
Total Masimo Financing Euronotes | Senior notes                    
Debt Instrument [Line Items]                    
Aggregate principal amount | €     € 3,000              
Proceeds from debt, net of issuance costs     € 3,000 $ 3,500,000,000            
Total Masimo Financing CHF Notes | Senior notes                    
Debt Instrument [Line Items]                    
Aggregate principal amount | SFr   SFr 2,383                
Total Masimo Financing CHF Notes | Bonds                    
Debt Instrument [Line Items]                    
Proceeds from debt, net of issuance costs $ 3,000,000,000.0 SFr 2,400