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Debt, cash and cash equivalents and lease liabilities - Summary of Bond Issues (Details) € in Millions, $ in Millions | Mar. 31, 2020 EUR (€) | Mar. 31, 2019 EUR (€) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 EUR (€) | Sep. 30, 2016 EUR (€) | Apr. 30, 2016 EUR (€) | Sep. 30, 2015 EUR (€) | Sep. 30, 2014 EUR (€) | Nov. 30, 2013 EUR (€)
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Sanofi Euro Medium Term Notes (EMTN) bonds | November 2013 EMTN ISIN FR0011625433 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  |  |  |  |  |  | 2.50%
Amount |  |  |  |  |  |  |  |  | € 1,000
Sanofi Euro Medium Term Notes (EMTN) bonds | April 2022 EMTN ISIN FR0014009KS6 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  |  |  |  |  | 0.875% |
Amount |  |  |  |  |  |  |  | € 850 |
Sanofi Euro Medium Term Notes (EMTN) bonds | September 2014 EMTN ISIN FR0012146801 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  |  |  |  |  | 1.75% |
Amount |  |  |  |  |  |  |  | € 1,510 |
Sanofi Euro Medium Term Notes (EMTN) bonds | April 2022 EMTN ISIN FR0014009KQ0 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  |  |  |  |  | 1.25% |
Amount |  |  |  |  |  |  |  | € 650 |
Sanofi Euro Medium Term Notes (EMTN) bonds | September 2015 EMTN ISIN FR0012969038 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  |  |  |  | 1.50% |  |
Amount |  |  |  |  |  |  | € 750 |  |
Sanofi Euro Medium Term Notes (EMTN) bonds | April 2016 EMTN ISIN FR0013143997 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  |  |  | 0.625% |  |  |
Amount |  |  |  |  |  | € 600 |  |  |
Sanofi Euro Medium Term Notes (EMTN) bonds | April 2016 EMTN ISIN FR0013144003 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  |  |  | 1.125% |  |  |
Amount |  |  |  |  |  | € 700 |  |  |
Sanofi Euro Medium Term Notes (EMTN) bonds | September 2016 EMTN ISIN FR0013201639 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  |  | 0.50% |  |  |  |
Amount |  |  |  |  | € 1,150 |  |  |  |
Sanofi Euro Medium Term Notes (EMTN) bonds | March 2020 EMTN ISIN FR0013505104 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual interest rate | 1.00% |  |  |  |  |  |  |  |
Amount | € 1,000 |  |  |  |  |  |  |  |
Sanofi Euro Medium Term Notes (EMTN) bonds | March 2020 EMTN ISIN FR0013505112 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual interest rate | 1.50% |  |  |  |  |  |  |  |
Amount | € 1,000 |  |  |  |  |  |  |  |
Sanofi Euro Medium Term Notes (EMTN) bonds | March 2018 EMTN ISIN FR0013324332 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  | 0.50% |  |  |  |  |
Amount |  |  |  | € 1,750 |  |  |  |  |
Sanofi Euro Medium Term Notes (EMTN) bonds | March 2018 EMTN ISIN FR0013324340 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  | 1.00% |  |  |  |  |
Amount |  |  |  | € 1,500 |  |  |  |  |
Sanofi Euro Medium Term Notes (EMTN) bonds | March 2018 EMTN ISIN FR0013324357 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  | 1.375% |  |  |  |  |
Amount |  |  |  | € 2,000 |  |  |  |  |
Sanofi Euro Medium Term Notes (EMTN) bonds | March 2018 EMTN ISIN FR0013324373 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual interest rate |  |  |  | 1.875% |  |  |  |  |
Amount |  |  |  | € 1,250 |  |  |  |  |
Sanofi Euro Medium Term Notes (EMTN) bonds | March 2019 EMTN ISIN FR0013409844 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual interest rate |  | 0.875% |  |  |  |  |  |  |
Amount |  | € 650 |  |  |  |  |  |  |
Sanofi Euro Medium Term Notes (EMTN) bonds | March 2019 EMTN ISIN FR0013409851 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual interest rate |  | 1.25% |  |  |  |  |  |  |
Amount |  | € 500 |  |  |  |  |  |  |
Shelf registration statement program | June 2018 SNF ISIN US801060AC87 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual interest rate |  |  | 3.375% |  |  |  |  |  |
Amount | $ |  |  | $ 1,000 |  |  |  |  |  |
Shelf registration statement program | June 2018 SNF ISIN US801060AD60 |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Annual interest rate |  |  | 3.625% |  |  |  |  |  |
Amount | $ |  |  | $ 1,000 |  |  |  |  |  |

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