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Treasury Risk Management - Additional Information (Detail) € in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 EUR (€) | Dec. 31, 2017 EUR (€) | Dec. 31, 2016 EUR (€) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Revolving credit facility | $ |  |  |  | $ 7,865 | $ 7,865
Gain (loss) in cash flow hedge reserve | € (292) | € (236) | € (168) |  |
Finance income (cost) | € (481) | (877) | € (563) |  |
Currency risk [Member] |  |  |  |  |
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Increase in commodity price percentage | 10.00% |  |  |  |
Decrease in commodity price percentage | 10.00% |  |  |  |
Impact of change in exchange rate | 10.00% |  |  | 10.00% |
Financial assets and liabilities other than functional currency amount | € 105 | 45 |  |  |
Percentage of increase of key foreign currencies against domestic currency | 10.00% |  |  |  |
Net investment in foreign operations | € 7,500 | 7,300 |  |  |
Exchange differences on translation | 3,300 | 3,400 |  |  |
Credit exposure | 14,500 | 16,200 |  |  |
Currency risk [Member] | United States of America, Dollars [Member] |  |  |  |  |
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Net investment hedges nominal value | 4,400 | 3,900 |  |  |
Currency risk [Member] | Switzerland, Francs [Member] |  |  |  |  |
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Net investment hedges nominal value | (1,300) | (1,100) |  |  |
Currency risk [Member] | Ten percentage strengthening against other currencies [member] |  |  |  |  |
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Impact on equity - trade-related cash flow hedges | 146 | 210 |  |  |
Impact on equity - net investment hedges | 312 | 277 |  |  |
Negative retranslation effect on net investment | 1,455 | 1,619 |  |  |
Currency risk [Member] | Ten percentage weakening against other currencies [member] |  |  |  |  |
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Impact on equity - trade-related cash flow hedges | (146) | (210) |  |  |
Impact on equity - net investment hedges | (312) | (277) |  |  |
Positive retranslation effect on net investment | 1,455 | 1,619 |  |  |
Currency risk [Member] | Ten percentage strengthening against US Dollar [member] |  |  |  |  |
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Impact on equity - trade-related cash flow hedges | 93 | 152 |  |  |
Currency risk [Member] | Ten percentage weakening against US Dollar [member] |  |  |  |  |
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Impact on equity - trade-related cash flow hedges | (93) | (152) |  |  |
Currency risk [Member] | Ten Percentage Increase in Commodity Price Risk [Member] |  |  |  |  |
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Gain (loss) in cash flow hedge reserve | 51 | 38 |  |  |
Currency risk [Member] | Ten Percentage Decrease in Commodity Price Risk [Member] |  |  |  |  |
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Gain (loss) in cash flow hedge reserve | (51) | (38) |  |  |
Currency risk [Member] | Ten percentage strengthening of EUR against key currency exposures [Member] |  |  |  |  |
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Foreign exchange gain | 11 | 5 |  |  |
Currency risk [Member] | Ten percentage weakening of EUR against key currency exposures [Member] |  |  |  |  |
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Foreign exchange loss | € 11 | € 5 |  |  |
Currency risk [Member] | Impact on equity trade related cash flow hedges [member] |  |  |  |  |
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Percentage of increase of key foreign currencies against domestic currency | 10.00% |  |  |  |
Currency risk [Member] | Impact on equity net investment hedges [member] |  |  |  |  |
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Percentage of increase of key foreign currencies against domestic currency | 10.00% |  |  |  |
Currency risk [Member] | Impact on equity net investment [member] |  |  |  |  |
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Percentage of increase of key foreign currencies against domestic currency | 10.00% |  |  |  |
Interest rate risk [Member] |  |  |  |  |
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Percentage of increase in floating interest rate | 1.00% |  |  | 1.00% |
Percentage of decrease in floating interest rate | 1.00% |  |  |  |
Average interest rate on short term borrowings | 0.90% | 0.90% |  |  |
Credit in equity from derivatives in cash flow hedge | € 17 | € 23 |  |  |
Derivatives in cash flow hedge relationships | € 19 | € 28 |  |  |
Interest rate risk [Member] | 2019 [Member] |  |  |  |  |
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Interest rate fixed on expected net debt | 99.00% | 63.00% |  |  |
Interest rate risk [Member] | 2020 [Member] |  |  |  |  |
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Interest rate fixed on expected net debt | 85.00% |  |  |  |
Interest rate risk [Member] | 2018 [Member] |  |  |  |  |
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Interest rate fixed on expected net debt |  | 76.00% |  |  |
Interest rate risk [Member] | One percentage strengthening of floating interest rate [member] |  |  |  |  |
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Finance income (cost) | € 8 | € (41) |  |  |
Interest rate risk [Member] | One percentage weakening in floating interest rate [member] |  |  |  |  |
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Finance income (cost) | (8) | 41 |  |  |
Commodity price risk [Member] |  |  |  |  |
Disclosure Of Treasury Risk Management [Line Items] |  |  |  |  |
Commodity derivatives | € 580 | € 382 |  |  |

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