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Derivatives and hedge accounting - Cash flow hedging - impact of hedging instruments on the statement of profit or loss and other comprehensive income (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
– Discontinued hedges    
Disclosure of detailed information about hedged items [line items]    
Hedge ineffectiveness recognised in the statement of profit or loss, gain (+) / loss (-)
– Discontinued hedges | – Interest rate swaps    
Disclosure of detailed information about hedged items [line items]    
Carrying amount cash flow hedge reserve at the end of the reporting period   330
Amount reclassified from CFH reserve to profit or loss   (263)
– Discontinued hedges | – Cross currency interest rate swaps    
Disclosure of detailed information about hedged items [line items]    
Carrying amount cash flow hedge reserve at the end of the reporting period   4
Amount reclassified from CFH reserve to profit or loss   (5)
Derivatives | Cash flow hedges    
Disclosure of detailed information about hedged items [line items]    
Change in value of hedged item used for calculating hedge ineffectiveness for the period (1,778) 3,986
Carrying amount cash flow hedge reserve at the end of the reporting period (3,157) (4,227)
Amount reclassified from CFH reserve to profit or loss (325) (313)
Change in value of hedging instrument recognised in OCI for the period 1,922 (3,982)
Hedge ineffectiveness recognised in the statement of profit or loss, gain (+) / loss (-) 48 20
Derivatives | Cash flow hedges | – Interest rate swaps    
Disclosure of detailed information about hedged items [line items]    
Change in value of hedged item used for calculating hedge ineffectiveness for the period (1,760) 4,037
Carrying amount cash flow hedge reserve at the end of the reporting period (3,200) (4,210)
Amount reclassified from CFH reserve to profit or loss (57) (50)
Change in value of hedging instrument recognised in OCI for the period 1,654 (4,279)
Hedge ineffectiveness recognised in the statement of profit or loss, gain (+) / loss (-) 58 21
Derivatives | Cash flow hedges | – Cross currency swaps    
Disclosure of detailed information about hedged items [line items]    
Change in value of hedged item used for calculating hedge ineffectiveness for the period 2  
Carrying amount cash flow hedge reserve at the end of the reporting period (35)  
Amount reclassified from CFH reserve to profit or loss (223)  
Change in value of hedging instrument recognised in OCI for the period 200  
Hedge ineffectiveness recognised in the statement of profit or loss, gain (+) / loss (-) (12)  
Derivatives | Cash flow hedges | – Cross currency interest rate swaps    
Disclosure of detailed information about hedged items [line items]    
Change in value of hedged item used for calculating hedge ineffectiveness for the period (20) (51)
Carrying amount cash flow hedge reserve at the end of the reporting period 78 (18)
Amount reclassified from CFH reserve to profit or loss (46) (263)
Change in value of hedging instrument recognised in OCI for the period 68 296
Hedge ineffectiveness recognised in the statement of profit or loss, gain (+) / loss (-) 2 (1)
Derivatives | – Discontinued hedges | – Interest rate swaps    
Disclosure of detailed information about hedged items [line items]    
Carrying amount cash flow hedge reserve at the end of the reporting period 194  
Amount reclassified from CFH reserve to profit or loss (150)  
Derivatives | – Discontinued hedges | – Cross currency swaps    
Disclosure of detailed information about hedged items [line items]    
Carrying amount cash flow hedge reserve at the end of the reporting period 7  
Amount reclassified from CFH reserve to profit or loss (5)  
Derivatives | – Discontinued hedges | – Cross currency interest rate swaps    
Disclosure of detailed information about hedged items [line items]    
Carrying amount cash flow hedge reserve at the end of the reporting period  
Amount reclassified from CFH reserve to profit or loss (1)  
Lending | Floating rate | – Interest rate swaps    
Disclosure of detailed information about hedged items [line items]    
Change in value of hedged item used for calculating hedge ineffectiveness for the period (2,694) 4,817
Carrying amount cash flow hedge reserve at the end of the reporting period (3,545) (5,460)
Amount reclassified from CFH reserve to profit or loss 590 395
Lending | Floating rate | – Cross currency swaps    
Disclosure of detailed information about hedged items [line items]    
Change in value of hedged item used for calculating hedge ineffectiveness for the period 27  
Carrying amount cash flow hedge reserve at the end of the reporting period (42)  
Amount reclassified from CFH reserve to profit or loss (185)  
Lending | Floating rate | – Cross currency interest rate swaps    
Disclosure of detailed information about hedged items [line items]    
Change in value of hedged item used for calculating hedge ineffectiveness for the period (20) (47)
Carrying amount cash flow hedge reserve at the end of the reporting period 78 (16)
Amount reclassified from CFH reserve to profit or loss (46) (269)
Borrowings | Floating rate | – Interest rate swaps    
Disclosure of detailed information about hedged items [line items]    
Change in value of hedged item used for calculating hedge ineffectiveness for the period 933 (775)
Carrying amount cash flow hedge reserve at the end of the reporting period 151 923
Amount reclassified from CFH reserve to profit or loss (497) (181)
Borrowings | Floating rate | – Cross currency swaps    
Disclosure of detailed information about hedged items [line items]    
Change in value of hedged item used for calculating hedge ineffectiveness for the period (25)  
Carrying amount cash flow hedge reserve at the end of the reporting period 1  
Amount reclassified from CFH reserve to profit or loss (33)  
Borrowings | Floating rate | – Cross currency interest rate swaps    
Disclosure of detailed information about hedged items [line items]    
Change in value of hedged item used for calculating hedge ineffectiveness for the period (7)
Carrying amount cash flow hedge reserve at the end of the reporting period (4)
Amount reclassified from CFH reserve to profit or loss 1 14
Other | – Interest rate swaps    
Disclosure of detailed information about hedged items [line items]    
Change in value of hedged item used for calculating hedge ineffectiveness for the period   (5)
Carrying amount cash flow hedge reserve at the end of the reporting period   (2)
Other | – Cross currency swaps    
Disclosure of detailed information about hedged items [line items]    
Change in value of hedged item used for calculating hedge ineffectiveness for the period  
Carrying amount cash flow hedge reserve at the end of the reporting period  
Amount reclassified from CFH reserve to profit or loss  
Other | – Cross currency interest rate swaps    
Disclosure of detailed information about hedged items [line items]    
Change in value of hedged item used for calculating hedge ineffectiveness for the period 4
Carrying amount cash flow hedge reserve at the end of the reporting period (2)
Amount reclassified from CFH reserve to profit or loss € (3)
Other | Cash flow hedges | – Interest rate swaps    
Disclosure of detailed information about hedged items [line items]    
Change in value of hedged item used for calculating hedge ineffectiveness for the period  
Carrying amount cash flow hedge reserve at the end of the reporting period  
Amount reclassified from CFH reserve to profit or loss