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Treasury Risk Management - Summary of Derivatives Used to Hedge (Detail) - EUR (€) € in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of detailed information about hedges [line items] |  |
Financial assets | € 4,746 | € 4,762
Trade payables and other liabilities | (14,803) | (14,126)
Current financial liabilities | (3,235) | (7,968)
Non-current financial liabilities | (21,650) | (16,462)
Derivatives designated as hedges [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Trade and other receivable | 82 | 57
Financial assets | 194 | 116
Trade payables and other liabilities | (140) | (113)
Current financial liabilities | (126) | (86)
Non-current financial liabilities | (276) | (335)
Total | (266) | (361)
Derivative used to hedge [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Total Financial assets | 276 | 173
Financial assets | 276 | 173
Total financial liabilities | (542) | (534)
Non-current financial liabilities | (542) | (534)
Total | (266) | (361)
Fair value hedges [member] | Cross currency interest rate swaps contract [member] | Derivatives designated as hedges [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Financial assets |  | 2
Total |  | 2
Cash flow hedges [member] | Foreign exchange derivatives [member] | Derivatives designated as hedges [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Trade and other receivable | 39 | 32
Trade payables and other liabilities | (25) | (40)
Total | 14 | (8)
Cash flow hedges [member] | Cross currency interest rate swaps contract [member] | Derivatives designated as hedges [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Financial assets | 69 | 2
Current financial liabilities |  | (18)
Non-current financial liabilities | (268) | (335)
Total | (199) | (351)
Cash flow hedges [member] | Commodity contracts [Member] | Derivatives designated as hedges [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Trade and other receivable |  | 12
Trade payables and other liabilities | (74) | (19)
Total | (74) | (7)
Hedges of net investment in foreign operations [member] | Foreign exchange derivatives [member] | Derivatives designated as hedges [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Financial assets | 58 | 9
Current financial liabilities | (21) | (103)
Total | 37 | (94)
Hedge accounting not applied [member] | Foreign exchange derivatives [member] | Derivatives designated as hedges [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Trade and other receivable | 42 | 13
Financial assets | 67 | 73
Trade payables and other liabilities | (41) | (54)
Current financial liabilities | (105) | 35
Total | (37) | 67
Hedge accounting not applied [member] | Cross currency interest rate swaps contract [member] | Derivatives designated as hedges [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Financial assets |  | 30
Non-current financial liabilities | (8) |
Total | (8) | € 30
Hedge accounting not applied [member] | Commodity contracts [Member] | Derivatives designated as hedges [member] |  |
Disclosure of detailed information about hedges [line items] |  |
Trade and other receivable | 1 |
Total | € 1 |

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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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