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Treasury Risk Management - Summary of Derivative Cash Flow Hedges (Detail) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Foreign exchange cash inflows € 3,426 € 3,510
Foreign exchange cash outflows (3,435) (3,536)
Interest rate swaps cash inflows 4,420 3,323
Interest rate swaps cash outflows (4,160) (3,347)
Commodity contracts cash flows (74) (19)
Within 1 year [Member]    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Foreign exchange cash inflows 3,426 3,510
Foreign exchange cash outflows (3,435) (3,536)
Interest rate swaps cash inflows 103 349
Interest rate swaps cash outflows (23) (319)
Commodity contracts cash flows (74) (19)
Due between 1 and 2 years [Member]    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Interest rate swaps cash inflows 795 64
Interest rate swaps cash outflows (756) (19)
Due between 2 and 3 years [Member]    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Interest rate swaps cash inflows 433 727
Interest rate swaps cash outflows (347) (753)
Due between 3 and 4 years [Member]    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Interest rate swaps cash inflows 1,158 50
Interest rate swaps cash outflows (1,147) (19)
Due between 4 and 5 years [Member]    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Interest rate swaps cash inflows 525 753
Interest rate swaps cash outflows (464) (797)
Later than 5 years [Member]    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Interest rate swaps cash inflows 1,406 1,380
Interest rate swaps cash outflows (1,423) (1,440)
Net carrying amount [Member]    
Disclosure Of Derivative Cash Flow Hedges [Line Items]    
Foreign exchange cash outflows 14 (8)
Interest rate swaps cash outflows (199) (351)
Commodity contracts cash flows € (74) € (7)