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Share-Based Payments - Summary of Details of Share Based Payment Arrangement BSAX (Detail) |  |  | 12 Months Ended
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Jun. 25, 2010 EUR (€) € / shares | Jan. 21, 2009 EUR (€) € / shares | Dec. 15, 2017 € / shares | Dec. 05, 2017 € / shares | Dec. 31, 2015 EUR (€)
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Plan expiration date |  |  | 12/15/2027 | 12/05/2027 |
Share entitlement per BCE2010(1) | € / shares |  |  | € 1 | € 1 |
BSAX [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Exercise price (in euros) |  |  |  |  | € 65
Not Later Than One Year [member] | BSAX [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting period (years) | 1 year | 1 year |  |  |
Plan expiration date | Jun. 24, 2020 | Jan. 20, 2019 |  |  |
Number of BSAX granted | € 457 | € 77 |  |  |
Share entitlement per BCE2010(1) | € / shares | € 15 | € 15 |  |  |
Exercise price (in euros) | € 65 | € 65 |  |  |
Not Later Than One Year [member] | BSAX [Member] | Option pricing model [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Grant date share fair value (in euros) | € 70 | € 70 |  |  |
Expected volatility | 40.00% | 40.00% |  |  |
Average life of BSAX (in years) | 0 | 0 |  |  |
Discount rate | 2.04% | 2.71% |  |  |
Expected dividends | 0.00% | 0.00% |  |  |
Performance conditions | NA | NA |  |  |
Fair value per BSAX (in euros) | € / shares | € 29.47 | € 30.32 |  |  |
Later Than One Year and Not Later Than Two Years [member] | BSAX [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting period (years) | 2 years | 2 years |  |  |
Plan expiration date | Jun. 24, 2020 | Jan. 20, 2019 |  |  |
Number of BSAX granted | € 457 | € 77 |  |  |
Share entitlement per BCE2010(1) | € / shares | € 15 | € 15 |  |  |
Exercise price (in euros) | € 65 | € 65 |  |  |
Later Than One Year and Not Later Than Two Years [member] | BSAX [Member] | Option pricing model [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Grant date share fair value (in euros) | € 70 | € 70 |  |  |
Expected volatility | 40.00% | 40.00% |  |  |
Average life of BSAX (in years) | 0 | 0 |  |  |
Discount rate | 2.23% | 2.98% |  |  |
Expected dividends | 0.00% | 0.00% |  |  |
Performance conditions | NA | NA |  |  |
Fair value per BSAX (in euros) | € / shares | € 30.88 | € 31.89 |  |  |
Later Than Two Years and Not Later Than Three Years [member] | BSAX [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting period (years) | 3 years | 3 years |  |  |
Plan expiration date | Jun. 24, 2020 | Jan. 20, 2019 |  |  |
Number of BSAX granted | € 456 | € 77 |  |  |
Share entitlement per BCE2010(1) | € / shares | € 15 | € 15 |  |  |
Exercise price (in euros) | € 65 | € 65 |  |  |
Later Than Two Years and Not Later Than Three Years [member] | BSAX [Member] | Option pricing model [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Grant date share fair value (in euros) | € 70 | € 70 |  |  |
Expected volatility | 40.00% | 40.00% |  |  |
Average life of BSAX (in years) | 0 | 0 |  |  |
Discount rate | 2.23% | 2.98% |  |  |
Expected dividends | 0.00% | 0.00% |  |  |
Performance conditions | NA | NA |  |  |
Fair value per BSAX (in euros) | € / shares | € 31.99 | € 33.05 |  |  |
Later Than Three Years and Not Later Than Four Years [member] | BSAX [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting period (years) | 4 years | 4 years |  |  |
Plan expiration date | Jun. 24, 2020 | Jan. 20, 2019 |  |  |
Number of BSAX granted | € 455 | € 75 |  |  |
Share entitlement per BCE2010(1) | € / shares | € 15 | € 15 |  |  |
Exercise price (in euros) | € 65 | € 65 |  |  |
Later Than Three Years and Not Later Than Four Years [member] | BSAX [Member] | Option pricing model [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Grant date share fair value (in euros) | € 70 | € 70 |  |  |
Expected volatility | 40.00% | 40.00% |  |  |
Average life of BSAX (in years) | 0 | 0 |  |  |
Discount rate | 2.50% | 3.11% |  |  |
Expected dividends | 0.00% | 0.00% |  |  |
Performance conditions | NA | NA |  |  |
Fair value per BSAX (in euros) | € / shares | € 33.44 | € 33.45 |  |  |

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- Definition The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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