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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
shares in Millions
12 Months Ended
Oct. 13, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Cash and cash equivalents   $ 665,000,000 $ 683,000,000 $ 682,000,000   $ 493,000,000
Fair value of long-term debt   156,000,000 183,000,000      
Impairment charges   $ 0 0 0    
Senior notes $ 4,500,000,000          
Interest expense recognition period   10 years        
Processing and services revenues   $ (9,123,000,000) (9,241,000,000) (6,596,000,000)    
Net earnings attributable to FIS common stockholders   (1,319,000,000) (568,000,000) (632,000,000)    
Provision (benefit) for income taxes   $ (319,000,000) $ 317,000,000 $ 379,000,000    
Purchase of common shares (in shares)   4 3 4    
Sales Revenue, Net [Member] | Geographic concentration risk [Member]            
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Concentration risk   26.00% 24.00% 22.00%    
Sales Revenue, Net [Member] | Product Concentration Risk [Member] | Processing Services [Member]            
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Concentration risk   70.00% 67.00% 75.00%    
Sales Revenue, Net [Member] | Product Concentration Risk [Member] | Professional Services [Member]            
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Concentration risk   12.00% 15.00% 14.00%    
Sales Revenue, Net [Member] | Product Concentration Risk [Member] | Software Licensing [Member]            
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Concentration risk   16.00% 16.00% 9.00%    
Sales Revenue, Net [Member] | Product Concentration Risk [Member] | Hardware and Other Miscellaneous [Member]            
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Concentration risk   2.00% 2.00% 2.00%    
Sales Revenue, Net, Software Licenses [Member] | Product Concentration Risk [Member] | Professional Services [Member]            
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Concentration risk   45.00%        
Software [Member] | Minimum [Member]            
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Estimated useful life   5 years        
Software [Member] | Maximum [Member]            
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Estimated useful life   10 years        
Building [Member]            
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Estimated useful life   30 years        
Furniture, Fixture and Computer Equipment [Member] | Minimum [Member]            
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Estimated useful life   3 years        
Furniture, Fixture and Computer Equipment [Member] | Maximum [Member]            
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Estimated useful life   7 years        
Customer Relationships [Member]            
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Expected customer attrition period   10 years        
Customer Relationships [Member] | Minimum [Member]            
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Intangible assets, estimated useful lives   5 years        
Customer Relationships [Member] | Maximum [Member]            
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Intangible assets, estimated useful lives   10 years        
Software [Member] | Minimum [Member]            
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Intangible assets, estimated useful lives   3 years        
Software [Member] | Maximum [Member]            
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Intangible assets, estimated useful lives   10 years        
Foreign Exchange Contract [Member]            
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Notional amount   $ 0 $ 143,000,000      
Foreign Entities [Member]            
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Cash and cash equivalents   415,000,000        
Cash Flow Hedging [Member] | Treasury Lock Hedge [Member]            
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Notional amount         $ 1,000,000,000.0  
Contract settlement payment $ 16,000,000          
Interest expense recognition period 10 years          
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Pro Forma [Member]            
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Processing and services revenues   455,000,000 410,000,000      
Net earnings attributable to FIS common stockholders   35,000,000 $ 45,000,000      
Provision (benefit) for income taxes   $ 20,000,000        
Retained Earnings [Member] | Accounting Standards Update 2014-09 [Member] | Pro Forma [Member]            
Summary of Significant Accounting Policies (Textuals) [Abstract]            
Cumulative impact of adoption of ASU       $ 30,000,000