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Fair value of assets and liabilities - Valuation techniques and range of unobservable inputs (Details)
€ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
EUR (€)
€ / shares
Dec. 31, 2023
EUR (€)
€ / shares
Dec. 31, 2022
EUR (€)
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Financial assets at fair value through profit or loss € 149,579 € 123,015  
Financial assets at fair value through other comprehensive income 46,343 41,116  
Financial liabilities at fair value through profit or loss 102,649 94,638  
Debt securities      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Financial assets at fair value through other comprehensive income 42,647 38,281  
Level 3      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Financial assets at fair value through profit or loss 8,341 8,179  
Financial assets at fair value through other comprehensive income 740 938  
Total financial assets 9,081 9,118 € 7,526
Financial liabilities at fair value through profit or loss 564 729  
Financial liabilities, at fair value € 564 € 729 € 732
Level 3 | Debt securities | Price (%) | Minimum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 68.00%    
Level 3 | Debt securities | Price (%) | Minimum | Loan Pricing Model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 99.00%    
Level 3 | Debt securities | Price (%) | Maximum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 68.00%    
Level 3 | Debt securities | Price (%) | Maximum | Loan Pricing Model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 99.00%    
Level 3 | Debt securities | Price (price per share) | Minimum | Price (%)      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, price | € / shares   97  
Level 3 | Debt securities | Price (price per share) | Maximum | Price (%)      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, price | € / shares   236  
Level 3 | Debt securities | Credit spread (bps) | Minimum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, basis point spread 0.0100 0.0094  
Level 3 | Debt securities | Credit spread (bps) | Maximum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, basis point spread 0.0100 0.0094  
Level 3 | Loans and advances      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Financial assets at fair value through profit or loss € 1,838 € 2,298  
Financial liabilities at fair value through profit or loss € 13  
Level 3 | Loans and advances | Price (%) | Minimum | Price (%)      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 0.00% 0.00%  
Level 3 | Loans and advances | Price (%) | Maximum | Price (%)      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 106.00% 117.00%  
Level 3 | Loans and advances | Credit spread (bps) | Minimum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, basis point spread   0.0001  
Level 3 | Loans and advances | Credit spread (bps) | Maximum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, basis point spread   0.0012  
Level 3 | Loans and advances | Interest rate (%) | Minimum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 5.00%    
Level 3 | Loans and advances | Interest rate (%) | Maximum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 5.00%    
Level 3 | Loans and advances | Prepayment rate (%) | Minimum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 2.00%    
Level 3 | Loans and advances | Prepayment rate (%) | Maximum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 2.00%    
Level 3 | (Reverse) repo's      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Financial assets at fair value through profit or loss € 3,441 € 1,832  
Level 3 | Structured notes      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Financial assets at fair value through profit or loss 2  
Financial liabilities at fair value through profit or loss € 14 € 47  
Level 3 | Structured notes | Price (%) | Minimum | Price (%)      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 92.00% 88.00%  
Level 3 | Structured notes | Price (%) | Maximum | Price (%)      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 104.00% 96.00%  
Level 3 | Structured notes | Credit spread (bps) | Minimum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, basis point spread 0.0100 0.0100  
Level 3 | Structured notes | Credit spread (bps) | Maximum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, basis point spread 0.0100 0.0101  
Level 3 | Structured notes | Equity volatility (%) | Minimum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage   9.00%  
Level 3 | Structured notes | Equity volatility (%) | Maximum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage   23.00%  
Level 3 | Structured notes | Equity/Equity correlation | Minimum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs,correlation   0.8  
Level 3 | Structured notes | Equity/Equity correlation | Maximum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs,correlation   0.9  
Level 3 | Structured notes | Equity/FX correlation | Minimum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs,correlation   (0.2)  
Level 3 | Structured notes | Equity/FX correlation | Maximum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs,correlation   0.6  
Level 3 | Structured notes | Dividend yield (%) | Minimum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage   0.00%  
Level 3 | Structured notes | Dividend yield (%) | Maximum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage   4.00%  
Level 3 | Derivatives at rates      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Financial assets at fair value through profit or loss € 292 € 283  
Financial liabilities at fair value through profit or loss € 300 € 301  
Level 3 | Derivatives at rates | Interest rate volatility (bps) | Minimum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, basis point spread   0.0001  
Level 3 | Derivatives at rates | Interest rate volatility (bps) | Maximum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, basis point spread   0.0003  
Level 3 | Derivatives at rates | Prepayment rate (%) | Minimum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 0.00% 0.00%  
Level 3 | Derivatives at rates | Prepayment rate (%) | Maximum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 0.00% 0.00%  
Level 3 | Derivatives at rates | Reset spread (%) | Minimum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 2.00%    
Level 3 | Derivatives at rates | Reset spread (%) | Maximum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 2.00%    
Level 3 | Derivatives at foreign exchange      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Financial assets at fair value through profit or loss € 4 € 2  
Financial liabilities at fair value through profit or loss € 3 € 3  
Level 3 | Derivatives at foreign exchange | Implied volatility (%) | Minimum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 4.00% 3.00%  
Level 3 | Derivatives at foreign exchange | Implied volatility (%) | Maximum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 9.00% 18.00%  
Level 3 | Derivative at credit      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Financial assets at fair value through profit or loss € 87 € 216  
Financial liabilities at fair value through profit or loss € 220 € 343  
Level 3 | Derivative at credit | Price (%) | Minimum | Price (%)      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 0.00% 0.00%  
Level 3 | Derivative at credit | Price (%) | Maximum | Price (%)      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 100.00% 100.00%  
Level 3 | Derivative at credit | Credit spread (bps) | Minimum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, basis point spread 0 0.0003  
Level 3 | Derivative at credit | Credit spread (bps) | Maximum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, basis point spread 0.0179 0.0149  
Level 3 | Derivatives at equity      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Financial assets at fair value through profit or loss € 12 € 20  
Financial liabilities at fair value through profit or loss € 22 € 17  
Level 3 | Derivatives at equity | Price (%) | Minimum | Price (%)      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 0.00% 0.00%  
Level 3 | Derivatives at equity | Price (%) | Maximum | Price (%)      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 21.00% 21.00%  
Level 3 | Derivatives at equity | Equity volatility (%) | Minimum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 13.00% 12.00%  
Level 3 | Derivatives at equity | Equity volatility (%) | Maximum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 76.00% 75.00%  
Level 3 | Derivatives at equity | Equity/Equity correlation | Minimum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs,correlation 0.0 0.2  
Level 3 | Derivatives at equity | Equity/Equity correlation | Maximum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs,correlation 1.0 1.0  
Level 3 | Derivatives at equity | Dividend yield (%) | Minimum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 0.00% 0.00%  
Level 3 | Derivatives at equity | Dividend yield (%) | Maximum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 20.00% 14.00%  
Level 3 | Derivatives at equity | Derivatives at equity | Minimum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs,correlation (0.1) (0.5)  
Level 3 | Derivatives at equity | Derivatives at equity | Maximum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs,correlation 0.6 1.0  
Level 3 | Other derivatives      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Financial assets at fair value through profit or loss € 13 € 14  
Financial liabilities at fair value through profit or loss € 4 € 7  
Level 3 | Other derivatives | Commodity volatility (%) | Minimum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 13.00% 11.00%  
Level 3 | Other derivatives | Commodity volatility (%) | Maximum | Option pricing model      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 74.00% 94.00%  
Level 3 | Loan and advances at FVOCI      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Financial assets at fair value through other comprehensive income € 476 € 676  
Level 3 | Loan and advances at FVOCI | Price (%) | Minimum | Price (%)      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 93.00% 85.00%  
Level 3 | Loan and advances at FVOCI | Price (%) | Maximum | Price (%)      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 100.00% 96.00%  
Level 3 | Loan and advances at FVOCI | Prepayment rate (%) | Minimum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 5.00%    
Level 3 | Loan and advances at FVOCI | Prepayment rate (%) | Maximum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 5.00%    
Level 3 | Equity at FVOCI      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Financial assets at fair value through other comprehensive income € 254 € 263  
Level 3 | Equity at FVOCI | Price (%) | Minimum | Price (%)      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 122.00% 122.00%  
Level 3 | Equity at FVOCI | Price (%) | Maximum | Price (%)      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 122.00% 122.00%  
Level 3 | Equity at FVOCI | Credit spread (bps) | Minimum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, basis point spread 0.00058 0.00052  
Level 3 | Equity at FVOCI | Credit spread (bps) | Maximum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, basis point spread 0.00058 0.00052  
Level 3 | Equity at FVOCI | Interest rate (%) | Minimum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 4.00% 4.00%  
Level 3 | Equity at FVOCI | Interest rate (%) | Maximum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 4.00% 4.00%  
Level 3 | Equity at FVOCI | Payout ratio | Minimum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 70.00%    
Level 3 | Equity at FVOCI | Payout ratio | Maximum | Present value techniques      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 90.00%    
Level 3 | Debt securities at FVOCI      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Financial assets at fair value through other comprehensive income € 10    
Level 3 | Equity securities      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Financial assets at fair value through profit or loss € 127 € 150  
Level 3 | Equity securities | Price (price per share) | Minimum | Price (%)      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, price | € / shares 0 0  
Level 3 | Equity securities | Price (price per share) | Maximum | Price (%)      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, price | € / shares 5,475 5,457  
Level 3 | Debt securities      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Financial assets at fair value through profit or loss € 2,524 € 3,364  
Financial assets at fair value through other comprehensive income € 10 0  
Financial liabilities at fair value through profit or loss   € 0  
Level 3 | Debt securities | Debt securities | Price (%) | Minimum | Price (%)      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 0.00% 0.00%  
Level 3 | Debt securities | Debt securities | Price (%) | Maximum | Price (%)      
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]      
Significant unobservable inputs, percentage 122.00% 122.00%