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Treasury Risk Management - Summary of Derivative Cash Flow Hedges (Detail) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Foreign exchange cash inflows € 3,136 € 2,254
Foreign exchange cash outflows (3,205) (2,259)
Interest rate swaps cash inflows 3,277 4,406
Interest rate swaps cash outflows (3,380) (4,136)
Commodity contracts cash inflows 40 31
Commodity contracts cash outflows (3) (4)
Within 1 year [Member]    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Foreign exchange cash inflows 3,136 2,254
Foreign exchange cash outflows (3,205) (2,259)
Interest rate swaps cash inflows 403 811
Interest rate swaps cash outflows (347) (756)
Commodity contracts cash inflows 40 31
Commodity contracts cash outflows (3) (4)
Due between 1 and 2 years [Member]    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Interest rate swaps cash inflows 1,077 442
Interest rate swaps cash outflows (1,147) (347)
Due between 2 and 3 years [Member]    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Interest rate swaps cash inflows 488 1,182
Interest rate swaps cash outflows (464) (1,147)
Due between 3 and 4 years [Member]    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Interest rate swaps cash inflows 436 536
Interest rate swaps cash outflows (473) (464)
Due between 4 and 5 years [Member]    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Interest rate swaps cash inflows 24 478
Interest rate swaps cash outflows (13) (473)
Later than 5 years [Member]    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Interest rate swaps cash inflows 849 957
Interest rate swaps cash outflows (936) (949)
Net carrying amount [Member]    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Foreign exchange cash outflows [1] (50)  
Interest rate swaps cash outflows [1] (221) (29)
Commodity contracts cash inflows [1] 40 31
Commodity contracts cash outflows [1] € (3) € (4)
[1] See note 16C.