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Employee Benefit Plans (Schedule of Options Granted) (Details) - shares
shares in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Options outstanding (in shares) 15 17 16 15
FIS Plan amended and restated [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Options available for grant, beginning (in shares) 21 26    
Options granted in period (in shares) 4 5    
Options outstanding (in shares) 15 17    
Options available for grant, ending (in shares) 17 21