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Summary of Significant Accounting Policies (Adjustments to Reflect Adoption of Topic 606) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues:      
Total revenues $ 4,277 $ 3,948 $ 3,704
Total operating expenses 1,498 1,420 1,440
Income before income taxes 1,064 872 133
Income tax provision 606 143 27
Net income attributable to Nasdaq $ 458 $ 729 $ 106
Diluted earnings per share (in dollars per share) $ 2.73 $ 4.30 $ 0.63
Assets      
Other current assets $ 390 $ 532  
Other non-current assets 291 390  
Deferred tax assets 121 421  
Total assets 15,700 15,354 $ 13,411
Liabilities      
Deferred revenue 194 161  
Non-current deferred revenue 87 126  
Total liabilities 10,251 9,474  
Nasdaq stockholders’ equity:      
Retained earnings 4,558 3,963  
Total Nasdaq stockholders' equity 5,449 5,880  
Total liabilities and equity 15,700 15,354  
Market Services      
Revenues:      
Total revenues 2,709 2,418 2,255
Corporate Services      
Revenues:      
Total revenues 528 501 477
Information Services      
Revenues:      
Total revenues 714 588 540
Market Technology      
Revenues:      
Total revenues $ 270 247 241
Accounting Standards Update 2014-09 | Restatement Adjustment      
Revenues:      
Total revenues   (17) (1)
Total operating expenses   (9) 2
Income before income taxes   (8) (3)
Income tax provision   (3) (1)
Net income attributable to Nasdaq   $ (5) $ (2)
Diluted earnings per share (in dollars per share)   $ (0.03) $ (0.01)
Assets      
Other current assets   $ (19) $ (15)
Other non-current assets   (38) (46)
Deferred tax assets   2 (1)
Total assets   (55) (62)
Liabilities      
Deferred revenue   (28) (24)
Non-current deferred revenue   (20) (36)
Total liabilities   (48) (60)
Nasdaq stockholders’ equity:      
Retained earnings   (7) (2)
Total Nasdaq stockholders' equity   (7) (2)
Total liabilities and equity   (55) (62)
Accounting Standards Update 2014-09 | Restatement Adjustment | Market Services      
Revenues:      
Total revenues   0 0
Accounting Standards Update 2014-09 | Restatement Adjustment | Corporate Services      
Revenues:      
Total revenues   (3) (3)
Accounting Standards Update 2014-09 | Restatement Adjustment | Information Services      
Revenues:      
Total revenues   0 0
Accounting Standards Update 2014-09 | Restatement Adjustment | Market Technology      
Revenues:      
Total revenues   $ (14) $ 2