v3.26.3
Nasdaq Stockholders' Equity (Narrative) (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2026
USD ($)
$ / shares
Oct. 22, 2026
USD ($)
Sep. 30, 2026
USD ($)
vote
$ / shares
shares
Jul. 31, 2026
USD ($)
Feb. 28, 2026
USD ($)
shares
Jan. 31, 2026
USD ($)
Sep. 30, 2026
USD ($)
vote
$ / shares
shares
Jun. 30, 2026
USD ($)
$ / shares
Mar. 31, 2026
USD ($)
$ / shares
Sep. 30, 2025
$ / shares
shares
Sep. 30, 2026
USD ($)
vote
$ / shares
shares
Sep. 30, 2025
USD ($)
$ / shares
shares
Dec. 31, 2025
shares
Stockholders Equity [Line Items]                          
Common stock, shares authorized (in shares) | shares     900,000,000       900,000,000       900,000,000   900,000,000
Common stock, shares issued (in shares) | shares     583,979,697       583,979,697       583,979,697   594,620,320
Common stock, shares outstanding (in shares) | shares     558,441,448       558,441,448     573,000,000 558,441,448 573,000,000 569,894,024
Common stock (in votes per share) | vote     1       1       1    
Common stock holder voting rights, maximum percentage of the then-outstanding shares of Nasdaq common stock     5.00%       5.00%       5.00%    
Common stock in treasury (in shares) | shares     25,538,249       25,538,249       25,538,249   24,726,296
Remaining authorized amount under share repurchase program | $     $ 2,200   $ 3,000   $ 2,200       $ 2,200    
Repurchases of common stock | $                     $ 1,226 $ 330  
Preferred stock, shares authorized (in shares) | shares     30,000,000       30,000,000       30,000,000    
Preferred stock par value (in dollars per share) | $ / shares     $ 0.01       $ 0.01       $ 0.01    
Preferred stock, shares issued (in shares) | shares     0       0       0   0
Preferred stock, shares outstanding (in shares) | shares     0       0       0   0
Dividends declared | $             $ 173 $ 174 $ 153   $ 500    
Cash dividends declared per common share (in dollars per share) | $ / shares             $ 0.31 $ 0.31 $ 0.27 $ 0.27 $ 0.89 $ 0.78  
Subsequent event                          
Stockholders Equity [Line Items]                          
Dividends declared | $ $ 173                        
Cash dividends declared per common share (in dollars per share) | $ / shares $ 0.31                        
January Accelerated Share Repurchase Agreement Program                          
Stockholders Equity [Line Items]                          
Repurchases of common stock | $           $ 300              
February Accelerated Share Repurchase Agreement Program                          
Stockholders Equity [Line Items]                          
Share-based payment arrangement, shares withheld for tax withholding obligation (in shares) | shares     2,175,752   3,142,730                
Excise tax | $     $ 10       $ 10       $ 10    
Repurchases of common stock | $     $ 48   $ 15                
July 2026 Accelerated Share Repurchase Agreement Program                          
Stockholders Equity [Line Items]                          
Repurchases of common stock | $       $ 250                  
September 2026 Accelerated Share Repurchase Agreement Program | Subsequent event                          
Stockholders Equity [Line Items]                          
Repurchases of common stock | $   $ 385                      
Other repurchases of common stock                          
Stockholders Equity [Line Items]                          
Share-based payment arrangement, shares withheld for tax withholding obligation (in shares) | shares                     811,953