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Other Assets and Receivables - Summary of Real Estate Held for Own Use and Equipment (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of other assets and receivables [Line Items]    
Beginning balance € 498 € 530
Ending balance 489 498
Carrying value [member]    
Disclosure of other assets and receivables [Line Items]    
Beginning balance 901 885
Additions 106 64
Acquired through business combinations   1
Capitalized subsequent expenditure (4) 18
Disposals (118) (52)
Unrealized gains/(losses) through equity (4) (32)
Realized gains/(losses) through income statement   (4)
Transfers to disposal groups 10  
Net exchange differences 13 23
Other (5)  
Ending balance 900 901
Accumulated amortization, depreciation and impairment losses [member]    
Disclosure of other assets and receivables [Line Items]    
Beginning balance 403 355
Depreciation through income statement 64 58
Disposals (54) (38)
Impairment losses   18
Impairment losses reversed (6)  
Transfer to investments in real estate   (1)
Net exchange differences 7 9
Other (3)  
Ending balance 411 403
General account real estate held for own use [member]    
Disclosure of other assets and receivables [Line Items]    
Beginning balance 263 307
Ending balance 208 263
General account real estate held for own use [member] | Carrying value [member]    
Disclosure of other assets and receivables [Line Items]    
Beginning balance 363 396
Additions   1
Capitalized subsequent expenditure (4) 18
Disposals (94) (26)
Unrealized gains/(losses) through equity (4) (32)
Transfer to investments in real estate   (1)
Realized gains/(losses) through income statement   (4)
Transfers to disposal groups 10  
Net exchange differences 4 11
Ending balance 276 363
General account real estate held for own use [member] | Accumulated amortization, depreciation and impairment losses [member]    
Disclosure of other assets and receivables [Line Items]    
Beginning balance 100 90
Depreciation through income statement 5 4
Disposals (32) (16)
Impairment losses   18
Impairment losses reversed (6)  
Transfer to investments in real estate   (1)
Net exchange differences 2 4
Ending balance 68 100
Equipment 1 [member]    
Disclosure of other assets and receivables [Line Items]    
Beginning balance 235 223
Ending balance 281 235
Equipment 1 [member] | Carrying value [member]    
Disclosure of other assets and receivables [Line Items]    
Beginning balance 538 488
Additions 105 63
Acquired through business combinations   1
Disposals (24) (26)
Net exchange differences 9 12
Other (5)  
Ending balance 624 538
Equipment 1 [member] | Accumulated amortization, depreciation and impairment losses [member]    
Disclosure of other assets and receivables [Line Items]    
Beginning balance 303 265
Depreciation through income statement 60 54
Disposals (22) (22)
Net exchange differences 5 5
Other (3)  
Ending balance € 343 € 303