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Net Earnings per Share (Tables)
9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share Attributable to FIS Common Stockholders The following table summarizes net earnings and net earnings per share attributable to FIS common stockholders for the three and nine months ended September 30, 2021 and 2020 (in millions, except per share amounts):
 Three months ended September 30,Nine months ended September 30,
 2021202020212020
Net earnings attributable to FIS common stockholders$158 $20 $126 $54 
Weighted average shares outstanding-basic613 620 618 618 
Plus: Common stock equivalent shares
Weighted average shares outstanding-diluted619 627 623 626 
Net earnings per share-basic attributable to FIS common stockholders$0.26 $0.03 $0.20 $0.09 
Net earnings per share-diluted attributable to FIS common stockholders$0.26 $0.03 $0.20 $0.09