In € thousand  | 
            Fixed-income securities  | 
            Other  | 
            Other investments Total  | 
            Unit-linked and index-linked life insurance investments  | 
        ||||
|---|---|---|---|---|---|---|---|---|
  | 
            2021  | 
            2020  | 
            2021  | 
            2020  | 
            2021  | 
            2020  | 
            2021  | 
            2020  | 
        
At 1 January  | 
            1,115,750  | 
            879,787  | 
            241,560  | 
            229,648  | 
            1,357,310  | 
            1,109,434  | 
            1,193,026  | 
            120,801  | 
        
Transfers from Level 3 to Level 1  | 
            –1,659  | 
            0  | 
            0  | 
            0  | 
            –1,659  | 
            0  | 
            0  | 
            0  | 
        
Transfers from Level 3 to Level 2  | 
            –10,379  | 
            –39,342  | 
            0  | 
            0  | 
            –10,379  | 
            –39,342  | 
            0  | 
            0  | 
        
Transfers to Level 3  | 
            18,314  | 
            2,610  | 
            0  | 
            1  | 
            18,314  | 
            2,611  | 
            1,860  | 
            604,062  | 
        
Gains and losses recognised in profit or loss  | 
            –31  | 
            –1,854  | 
            2,381  | 
            –24,777  | 
            2,350  | 
            –26,631  | 
            –11,769  | 
            6,710  | 
        
Gains and losses recognised in other comprehensive income  | 
            16,378  | 
            14,275  | 
            3,275  | 
            1,874  | 
            19,653  | 
            16,149  | 
            0  | 
            0  | 
        
Additions  | 
            788,684  | 
            258,597  | 
            238,737  | 
            108,603  | 
            1,027,421  | 
            367,201  | 
            117,992  | 
            695  | 
        
Disposals  | 
            –395,158  | 
            –11,267  | 
            –111,595  | 
            –88,333  | 
            –506,753  | 
            –99,600  | 
            –531,762  | 
            –10,784  | 
        
Changes from currency translation  | 
            391  | 
            –189  | 
            –166  | 
            –550  | 
            226  | 
            –739  | 
            –3,516  | 
            0  | 
        
Change in basis of consolidation  | 
            0  | 
            13,133  | 
            0  | 
            15,094  | 
            0  | 
            28,227  | 
            0  | 
            471,541  | 
        
At 31 December  | 
            1,532,290  | 
            1,115,750  | 
            374,193  | 
            241,560  | 
            1,906,483  | 
            1,357,310  | 
            765,831  | 
            1,193,026  |