v3.25.4
Equity - Text Details (Detail)
€ / shares in Units, € in Millions
1 Months Ended 10 Months Ended 12 Months Ended
Sep. 15, 2025
EUR (€)
€ / shares
shares
Jun. 03, 2025
EUR (€)
shares
€ / shares
May 08, 2025
€ / shares
Jun. 30, 2025
shares
May 31, 2025
EUR (€)
€ / shares
shares
Aug. 31, 2024
EUR (€)
shares
May 31, 2024
EUR (€)
€ / shares
shares
May 31, 2023
EUR (€)
€ / shares
shares
Dec. 31, 2024
EUR (€)
shares
Dec. 31, 2025
EUR (€)
shares
€ / shares
Dec. 31, 2024
EUR (€)
shares
€ / shares
Dec. 31, 2023
EUR (€)
€ / shares
shares
Aug. 05, 2024
EUR (€)
shares
€ / shares
Dec. 31, 2022
EUR (€)
Share Repurchase Program [Line Items]                            
Cash outflow for share purchase transactions related to employee option and share plans and reduction of share capital                   € 13        
Provision used, other provisions                   1,821 € 1,336      
Purchase of treasury shares                     60      
Forward contracts                 € 316 125 59 € 143    
Cancellation of treasury shares                   € 0 € 0 € 0    
Dividends paid, ordinary shares per share (in euros per share) | € / shares     € 0.85   € 0.85   € 0.85 € 0.85   € 0.85 € 0.85 € 0.85    
Dividends paid, ordinary shares         € 789   € 768 € 749            
Maximum percentage of cash dividend         0.50                  
Shareholders electing cash dividend         0.414                  
Percentage of shareholders electing share dividend         59.00%                  
Increase in number of ordinary shares issued (in shares) | shares       22,980,748 22,980,748   30,860,582 39,334,938            
Dividends proposed or declared (in EUR per share) | € / shares                   € 0.85        
Shareholder equity subject to limitations                 3,254 € 1,545 € 3,254      
Shareholder equity subject to limitations ordinary shares                 188 193 188      
Legal reserves required by Dutch law                 1,052 1,005 1,052      
Group equity                 12,043 10,990 12,043 € 12,061   € 13,283
Reserve of cash flow hedges                 1 33 1      
Reserve of gains and losses on financial assets measured at fair value through other comprehensive income                 (90) € (89) (90)      
Bottom of range                            
Share Repurchase Program [Line Items]                            
Dividend payout ratio                   40.00%        
Top of range                            
Share Repurchase Program [Line Items]                            
Dividend payout ratio                   50.00%        
Forward contracts                            
Share Repurchase Program [Line Items]                            
Notional amount € 86 € 127                     € 65  
Long-term Incentive And Employee Stock Purchases Plans 2025                            
Share Repurchase Program [Line Items]                            
Share repurchase program, authorised, number of shares (in shares) | shares 2,000,000 6,000,000                        
Purchase of treasury shares € 3 € 121                        
Long-term Incentive And Employee Stock Purchases Plans 2025 | Forward contracts                            
Share Repurchase Program [Line Items]                            
Nominal amount of hedging instrument (in shares) | shares   6,000,000                        
Average price of hedging instrument (in EUR per share) | € / shares 21.59 21.17                        
Long-term Incentive And Employee Stock Purchases Plans 2024                            
Share Repurchase Program [Line Items]                            
Purchase of treasury shares           € 60                
Share repurchase program, authorized, amount                         € 125  
Number of treasury shares acquired (in shares) | shares           2,200,000                
Long-term Incentive And Employee Stock Purchases Plans 2024 | Forward contracts                            
Share Repurchase Program [Line Items]                            
Nominal amount of hedging instrument (in shares) | shares                         2,500,000  
Average price of hedging instrument (in EUR per share) | € / shares                         26.40  
Share-based compensation transactions                            
Share Repurchase Program [Line Items]                            
Cancellation of treasury shares (in shares) | shares                   0        
Purchase of treasury shares                     € 203 € 125    
Number of treasury shares acquired (in shares) | shares                   0 9,281,227 3,000,000    
Share-based compensation transactions | Forward contracts                            
Share Repurchase Program [Line Items]                            
Notional amount                 € 142 € 283 € 142      
Nominal amount of hedging instrument (in shares) | shares                 6,500,000 12,500,000 6,500,000      
Capital reduction program                            
Share Repurchase Program [Line Items]                            
Cancellation of treasury shares (in shares) | shares                   0 4,437,164 15,134,054    
Purchase of treasury shares                     € 167 € 483    
Number of treasury shares acquired (in shares) | shares                   0 4,437,164 12,964,445    
Cancellation of treasury shares                     € 167 € 566    
Non-income taxes / social security                            
Share Repurchase Program [Line Items]                            
Provision used, other provisions                   € 33        
Ordinary shares                            
Share Repurchase Program [Line Items]                            
Number of shares authorised (in shares) | shares                 2,000,000,000 2,000,000,000 2,000,000,000 2,000,000,000    
Number of shares issued and fully paid (in shares) | shares                 939,939,384 962,920,132 939,939,384 913,515,966    
Par value per share (in EUR per share) | € / shares                   € 0.20        
Preference shares                            
Share Repurchase Program [Line Items]                            
Number of shares authorised (in shares) | shares                 2,000,000,000 2,000,000,000 2,000,000,000 2,000,000,000    
Number of shares issued | shares                   0        
Retained earnings                            
Share Repurchase Program [Line Items]                            
Forward contracts                 € 316 € 125 € (251) € (465)    
Cancellation of treasury shares                     (166) (563)    
Group equity                 3,650 3,575 3,650 5,402   6,832
Currency translation differences                            
Share Repurchase Program [Line Items]                            
Group equity                 € 2,014 € 347 € 2,014 € 1,263   € 1,866