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Guarantees, commitments and risks (Details 8) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |  |
Held-for-trading financial instruments, Securities | [1] | € 6,012 | € 6,166
Held-for-trading financial instruments, Non-hedging and trading derivatives |  | 209 | 87
Held-to-maturity financial instruments, Securities | [2] | 73 | 75
Available-for-sale financial instruments, Securities | [2] | 207 | 238
Trade receivables and other |  | 15,583 | 17,324
Financing receivables | [1] | 1,918 | 2,328
Trade payables and other | [3] | 16,793 | 16,754
Financing payables | [1] | 25,620 | 29,318
Finance income (expense) recognized in Profit and loss account | [4] | (42) | (524)
Finance income (expense) recognized in Other comprehensive income | [4] | (6) | 883
Financial Assets At Fair Value Through Profit Or Loss Classified As Held For Trading Category [Member] |  |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |  |
Finance income (expense) recognized in Profit and loss account | [1] | (111) | (21)
Nonhedging And Trading Derivatives [Member] |  |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |  |
Finance income (expense) recognized in Profit and loss account | [5] | 793 | (465)
Financial Assets Available for sale Category [Member] |  |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |  |
Finance income (expense) recognized in Profit and loss account | [2] | 9 | 9
Finance income (expense) recognized in Other comprehensive income | [2] | (4) | (4)
Trade Receivables And Other [Member] |  |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |  |
Finance income (expense) recognized in Profit and loss account | [2] | (958) | (1,116)
Financing Receivables [Member] |  |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |  |
Finance income (expense) recognized in Profit and loss account | [2] | (116) | 128
Trade payables and other [Member] |  |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |  |
Finance income (expense) recognized in Profit and loss account | [3] | (51) | 287
Financing payables [Member] |  |  |
DisclosureOfContingentLiabilitiesExplanatoryLineItems [Line Items] |  |  |
Finance income (expense) recognized in Profit and loss account | [1] | € (1,137) | € (291)
[1] | Income or expense were recognized in the profit and loss account within &#147;Finance income (expense)&#148;.
[2] | In the profit and loss account, economic effects were essentially recognized as expense within &#147;Purchase, services and other&#148; for &euro;933 million (expense for &euro;840 million in 2016) (impairments net of reversal) and as expense for &euro;25 million within &#147;Finance income (expense)&#148; (expense for &euro;276 million in 2016) (exchange rate differences at year-end and amortized cost).
[3] | In the profit and loss account, exchange differences arising from accounts denominated in foreign currency and translated into euro at year-end were primarily recognized within &#147;Finance income (expense)&#148;.
[4] | In the profit and loss account, income or expense were recognized within &#147;Net sales from operations&#148; and &#147;Purchase, services and other&#148; as expense for &euro;54 million (expense for &euro;523 million in 2016) and as income within &#147;Finance income (expense)&#148; for &euro;12 million (expense for &euro;1 million in 2016) (time value component).
[5] | In the profit and loss account, economic effects were recognized as loss within &#147;Other operating income (loss)&#148; for &euro;44 million (income for &euro;17 million in 2016) and as income within &#147;Finance income (expense)&#148; for &euro;837 million (loss for &euro;482 million in 2016).

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- Definition The amount of current financial assets measured at fair value through profit or loss classified as held for trading. [Refer: Financial assets at fair value through profit or loss, classified as held for trading] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_a&doctype=Standard&book=B -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of current financial assets available-for-sale. [Refer: Financial assets available-for-sale; Current financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_d&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The amount of current held-to-maturity investments. [Refer: Held-to-maturity investments] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_b&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition 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] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The fair value gains (losses) recognised in other comprehensive income on financial assets reclassified out of the available-for-sale category. [Refer: Financial assets available-for-sale; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 12A -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_12A_d&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35H&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35I&doctype=Standard -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35M&doctype=Standard -URIDate 2017-03-09 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35N&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The gains (losses) recognised in profit or loss on financial assets reclassified out of the fair value through profit or loss category. [Refer: Financial assets at fair value through profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 12A -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_12A_e&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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