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Provisions for employee benefits - Plan assets (Details) - EUR (€)
€ in Millions
Dec. 31, 2019
Dec. 31, 2018
Statement    
Cash and cash equivalents € 32 € 115
Equity securities 39 37
Debt securities 388 238
Real estate 7 6
Derivatives 2 2
Investment funds 79 56
Assets held by insurance company 20 21
Other 65 70
Total 632 545
Level 1    
Statement    
Cash and cash equivalents 32 115
Equity securities 39 37
Debt securities 388 238
Real estate 7 6
Derivatives 2 2
Investment funds 79 56
Assets held by insurance company 17 18
Other 65 70
Total 629 542
Level 2 and 3 of fair value hierarchy    
Statement    
Assets held by insurance company 3 3
Total € 3 € 3