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Provisions for employee benefits - Plan assets (Details) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Statement    
Cash and cash equivalents € 117 € 32
Equity securities 38 39
Debt securities 297 388
Real estate 8 7
Derivatives 2 2
Investment funds 76 79
Assets held by insurance company 23 20
Other 87 65
Total 648 632
Level 1    
Statement    
Cash and cash equivalents 117 32
Equity securities 38 39
Debt securities 297 388
Real estate 8 7
Derivatives 2 2
Investment funds 76 79
Assets held by insurance company 20 17
Other 87 65
Total 645 629
Level 2 and 3 of fair value hierarchy    
Statement    
Assets held by insurance company 3 3
Total € 3 € 3