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Share-Based Payments - Equity-Settled Share-Based Payments (Details) - Own - EUR (€)
shares in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
SHARE-BASED PAYMENTS    
Matching contribution to employee investment   40.00%
Actual matching contribution (as a percent) 80.00%  
Number of shares purchased 1.4 5.0
Non-executives    
SHARE-BASED PAYMENTS    
Subsidy to purchase SAP shares   € 20
Actual subsidy to purchase SAP shares € 40