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Employee Benefit Plans (Schedule of Options Granted) (Details) - Stock Options - shares
shares in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
OPtion Available for Grant        
Options outstanding (in shares) 10 15 17 16
FIS Plan amended and restated        
OPtion Available for Grant        
Options available for grant, beginning (in shares) 17 21    
Options granted in period (in shares) 1 4    
Options outstanding (in shares) 10 15    
Options available for grant, ending (in shares) 15 17