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Shareholders' Equity - Summary of Revaluation Reserves (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reserve of gains and losses on remeasuring available-for-sale financial assets [member]      
Disclosure of revaluation reserve [Line Items]      
Beginning balance € 1,910 € 3,427 € 3,326
Gross revaluation 3,470 (2,142) 1,403
Net (gains) / losses transferred to income statement (412) 66 (1,330)
Foreign currency translation differences 8 46 (228)
Tax effect (630) 514 285
Other     (28)
Ending balance 4,348 1,910 3,427
Reserve of cash flow hedges [member]      
Disclosure of revaluation reserve [Line Items]      
Beginning balance 1,479 1,402 1,904
Gross revaluation 89 85 (115)
Net (gains) / losses transferred to income statement (97) (80) (738)
Foreign currency translation differences 27 71 (216)
Tax effect 3 1 567
Other     1
Ending balance 1,502 1,479 1,402
Revaluation account [member]      
Disclosure of revaluation reserve [Line Items]      
Beginning balance 3,436 4,898 5,289
Gross revaluation 3,556 (2,090) 1,296
Net (gains) / losses transferred to income statement (509) (14) (2,069)
Net (gains) / losses transferred to retained earnings (32)    
Foreign currency translation differences 37 119 (452)
Tax effect (619) 522 860
Other   1 (27)
Ending balance 5,868 3,436 4,898
Real estate held for own use [member]      
Disclosure of revaluation reserve [Line Items]      
Beginning balance 46 68 59
Gross revaluation (4) (32) 8
Net (gains) / losses transferred to retained earnings (32)    
Foreign currency translation differences 1 2 (8)
Tax effect 8 7 9
Ending balance € 19 € 46 € 68