Derivative financial instruments (Details) - EUR (€) € in Millions	Dec. 31, 2017	Dec. 31, 2016
Fair value of financial instruments
Assets-Total	€ 197	€ 235
Liabilities-Total	(268)	(236)
Notional-Assets Total	11,616	8,842
Notional-Liabilities Total	10,323	9,452
Forward foreign exchange contracts
Fair value of financial instruments
Assets-Trading	73	61
Liabilities-Trading	(88)	(135)
Notional-Assets Trading	5,858	3,777
Notional-Liabilities Trading	7,002	7,526
Interest rate swaps
Fair value of financial instruments
Liabilities-Trading		(29)
Notional-Liabilities Trading		329
Currency options bought
Fair value of financial instruments
Assets-Trading	12	3
Notional-Assets Trading	664	569
Currency options sold
Fair value of financial instruments
Liabilities-Trading	(4)
Notional-Liabilities Trading	163
Other derivatives
Fair value of financial instruments
Liabilities-Trading	(2)	(5)
Notional-Liabilities Trading	100	157
Hedges on net investment in foreign subsidiaries \| Forward foreign exchange contracts
Fair value of financial instruments
Assets-Hedging	38	20
Liabilities-Hedging	(2)	(1)
Notional-Assets Hedging	3,491	1,829
Notional-Liabilities Hedging	773	255
Cash flow hedges \| Forward foreign exchange contracts
Fair value of financial instruments
Assets-Hedging	56	12
Liabilities-Hedging	(6)	(9)
Notional-Assets Hedging	1,305	382
Notional-Liabilities Hedging	465	185
Fair value hedges \| Forward foreign exchange contracts
Fair value of financial instruments
Assets-Hedging	1	21
Liabilities-Hedging	(1)	(51)
Notional-Assets Hedging	165	350
Notional-Liabilities Hedging	79	689
Fair value hedges \| Interest rate swaps
Fair value of financial instruments
Assets-Hedging		42
Notional-Assets Hedging		300
Fair value hedges \| Firm commitments
Fair value of financial instruments
Assets-Hedging	17	34
Liabilities-Hedging	(24)	(6)
Notional-Assets Hedging	133	633
Notional-Liabilities Hedging	229	311
Cash flow and fair value hedges \| Cross-currency interest rate swaps
Fair value of financial instruments
Assets-Hedging		42
Liabilities-Hedging	(141)
Notional-Assets Hedging		€ 1,002
Notional-Liabilities Hedging	€ 1,512

The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of derivative financial assets held for trading. [Refer: Derivative financial assets; Financial assets at fair value through profit or loss, classified as held for trading]

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