Segment Information - Summary of Net Sales by Segment and Geographical Area (Details) € in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2023 EUR (€) segment	Jun. 30, 2022 EUR (€)	Dec. 31, 2022 EUR (€) segment
Disclosure of geographical areas [line items]
Net sales	€ 20,187	€ 19,790	€ 42,997
Number of operating segments \| segment	2		3
Biopharma
Disclosure of geographical areas [line items]
Net sales	€ 17,467	17,147	€ 37,812
Biopharma \| Specialty Care
Disclosure of geographical areas [line items]
Net sales	8,691	7,642
Biopharma \| Dupixent
Disclosure of geographical areas [line items]
Net sales	4,878	3,577
Biopharma \| Aubagio
Disclosure of geographical areas [line items]
Net sales	635	1,017
Biopharma \| Cerezyme
Disclosure of geographical areas [line items]
Net sales	377	367
Biopharma \| Myozyme/Lumizyme
Disclosure of geographical areas [line items]
Net sales	436	487
Biopharma \| Fabrazyme
Disclosure of geographical areas [line items]
Net sales	496	458
Biopharma \| Jevtana
Disclosure of geographical areas [line items]
Net sales	176	203
Biopharma \| Alprolix
Disclosure of geographical areas [line items]
Net sales	260	237
Biopharma \| Eloctate
Disclosure of geographical areas [line items]
Net sales	248	291
Biopharma \| General Medicines
Disclosure of geographical areas [line items]
Net sales	6,386	7,307
Biopharma \| Core Assets
Disclosure of geographical areas [line items]
Net sales	3,182	3,205
Biopharma \| Lovenox
Disclosure of geographical areas [line items]
Net sales	607	714
Biopharma \| Toujeo
Disclosure of geographical areas [line items]
Net sales	580	541
Biopharma \| Plavix
Disclosure of geographical areas [line items]
Net sales	476	508
Biopharma \| Non-Core Assets
Disclosure of geographical areas [line items]
Net sales	2,924	3,786
Biopharma \| Lantus
Disclosure of geographical areas [line items]
Net sales	800	1,271
Biopharma \| Other non-core assets
Disclosure of geographical areas [line items]
Net sales	1,910	2,270
Biopharma \| Industrial sales
Disclosure of geographical areas [line items]
Net sales	280	316
Biopharma \| Vaccines
Disclosure of geographical areas [line items]
Net sales	2,390	2,198
Biopharma \| Polio/Pertussis/ Hib Vaccines
Disclosure of geographical areas [line items]
Net sales	1,154	1,202
Biopharma \| Influenza Vaccines
Disclosure of geographical areas [line items]
Net sales	162	181
Consumer Healthcare
Disclosure of geographical areas [line items]
Net sales	2,720	2,643	5,185
Consumer Healthcare \| Allergy
Disclosure of geographical areas [line items]
Net sales	446	434
Consumer Healthcare \| Pain Care
Disclosure of geographical areas [line items]
Net sales	559	582
Consumer Healthcare \| Digestive Wellness
Disclosure of geographical areas [line items]
Net sales	814	726
Europe
Disclosure of geographical areas [line items]
Net sales	5,034	4,767	9,999
Europe \| Biopharma
Disclosure of geographical areas [line items]
Net sales	4,194	3,986
Europe \| Biopharma \| Specialty Care
Disclosure of geographical areas [line items]
Net sales	1,621	1,535
Europe \| Biopharma \| Dupixent
Disclosure of geographical areas [line items]
Net sales	587	450
Europe \| Biopharma \| Aubagio
Disclosure of geographical areas [line items]
Net sales	249	269
Europe \| Biopharma \| Cerezyme
Disclosure of geographical areas [line items]
Net sales	120	126
Europe \| Biopharma \| Myozyme/Lumizyme
Disclosure of geographical areas [line items]
Net sales	181	206
Europe \| Biopharma \| Fabrazyme
Disclosure of geographical areas [line items]
Net sales	122	116
Europe \| Biopharma \| Jevtana
Disclosure of geographical areas [line items]
Net sales	8	19
Europe \| Biopharma \| Alprolix
Disclosure of geographical areas [line items]
Net sales	0	0
Europe \| Biopharma \| Eloctate
Disclosure of geographical areas [line items]
Net sales	0	0
Europe \| Biopharma \| General Medicines
Disclosure of geographical areas [line items]
Net sales	2,003	2,130
Europe \| Biopharma \| Core Assets
Disclosure of geographical areas [line items]
Net sales	1,011	978
Europe \| Biopharma \| Lovenox
Disclosure of geographical areas [line items]
Net sales	329	353
Europe \| Biopharma \| Toujeo
Disclosure of geographical areas [line items]
Net sales	221	211
Europe \| Biopharma \| Plavix
Disclosure of geographical areas [line items]
Net sales	48	52
Europe \| Biopharma \| Non-Core Assets
Disclosure of geographical areas [line items]
Net sales	728	858
Europe \| Biopharma \| Lantus
Disclosure of geographical areas [line items]
Net sales	191	223
Europe \| Biopharma \| Other non-core assets
Disclosure of geographical areas [line items]
Net sales	497	593
Europe \| Biopharma \| Industrial sales
Disclosure of geographical areas [line items]
Net sales	264	294
Europe \| Biopharma \| Vaccines
Disclosure of geographical areas [line items]
Net sales	570	321
Europe \| Biopharma \| Polio/Pertussis/ Hib Vaccines
Disclosure of geographical areas [line items]
Net sales	148	161
Europe \| Biopharma \| Influenza Vaccines
Disclosure of geographical areas [line items]
Net sales	37	37
Europe \| Consumer Healthcare
Disclosure of geographical areas [line items]
Net sales	840	781
Europe \| Consumer Healthcare \| Allergy
Disclosure of geographical areas [line items]
Net sales	49	37
Europe \| Consumer Healthcare \| Pain Care
Disclosure of geographical areas [line items]
Net sales	254	261
Europe \| Consumer Healthcare \| Digestive Wellness
Disclosure of geographical areas [line items]
Net sales	285	252
United States
Disclosure of geographical areas [line items]
Net sales	7,988	7,562	€ 18,275
United States \| Biopharma
Disclosure of geographical areas [line items]
Net sales	7,366	6,917
United States \| Biopharma \| Specialty Care
Disclosure of geographical areas [line items]
Net sales	5,622	4,829
United States \| Biopharma \| Dupixent
Disclosure of geographical areas [line items]
Net sales	3,682	2,653
United States \| Biopharma \| Aubagio
Disclosure of geographical areas [line items]
Net sales	348	689
United States \| Biopharma \| Cerezyme
Disclosure of geographical areas [line items]
Net sales	94	94
United States \| Biopharma \| Myozyme/Lumizyme
Disclosure of geographical areas [line items]
Net sales	135	163
United States \| Biopharma \| Fabrazyme
Disclosure of geographical areas [line items]
Net sales	251	221
United States \| Biopharma \| Jevtana
Disclosure of geographical areas [line items]
Net sales	128	142
United States \| Biopharma \| Alprolix
Disclosure of geographical areas [line items]
Net sales	215	198
United States \| Biopharma \| Eloctate
Disclosure of geographical areas [line items]
Net sales	183	232
United States \| Biopharma \| General Medicines
Disclosure of geographical areas [line items]
Net sales	1,087	1,410
United States \| Biopharma \| Core Assets
Disclosure of geographical areas [line items]
Net sales	762	773
United States \| Biopharma \| Lovenox
Disclosure of geographical areas [line items]
Net sales	5	7
United States \| Biopharma \| Toujeo
Disclosure of geographical areas [line items]
Net sales	118	128
United States \| Biopharma \| Plavix
Disclosure of geographical areas [line items]
Net sales	4	5
United States \| Biopharma \| Non-Core Assets
Disclosure of geographical areas [line items]
Net sales	322	624
United States \| Biopharma \| Lantus
Disclosure of geographical areas [line items]
Net sales	180	425
United States \| Biopharma \| Other non-core assets
Disclosure of geographical areas [line items]
Net sales	139	196
United States \| Biopharma \| Industrial sales
Disclosure of geographical areas [line items]
Net sales	3	13
United States \| Biopharma \| Vaccines
Disclosure of geographical areas [line items]
Net sales	657	678
United States \| Biopharma \| Polio/Pertussis/ Hib Vaccines
Disclosure of geographical areas [line items]
Net sales	200	224
United States \| Biopharma \| Influenza Vaccines
Disclosure of geographical areas [line items]
Net sales	19	12
United States \| Consumer Healthcare
Disclosure of geographical areas [line items]
Net sales	622	645
United States \| Consumer Healthcare \| Allergy
Disclosure of geographical areas [line items]
Net sales	246	249
United States \| Consumer Healthcare \| Pain Care
Disclosure of geographical areas [line items]
Net sales	89	103
United States \| Consumer Healthcare \| Digestive Wellness
Disclosure of geographical areas [line items]
Net sales	69	62
Other countries
Disclosure of geographical areas [line items]
Net sales	7,165	7,461
Other countries \| Biopharma
Disclosure of geographical areas [line items]
Net sales	5,907	6,244
Other countries \| Biopharma \| Specialty Care
Disclosure of geographical areas [line items]
Net sales	1,448	1,278
Other countries \| Biopharma \| Dupixent
Disclosure of geographical areas [line items]
Net sales	609	474
Other countries \| Biopharma \| Aubagio
Disclosure of geographical areas [line items]
Net sales	38	59
Other countries \| Biopharma \| Cerezyme
Disclosure of geographical areas [line items]
Net sales	163	147
Other countries \| Biopharma \| Myozyme/Lumizyme
Disclosure of geographical areas [line items]
Net sales	120	118
Other countries \| Biopharma \| Fabrazyme
Disclosure of geographical areas [line items]
Net sales	123	121
Other countries \| Biopharma \| Jevtana
Disclosure of geographical areas [line items]
Net sales	40	42
Other countries \| Biopharma \| Alprolix
Disclosure of geographical areas [line items]
Net sales	45	39
Other countries \| Biopharma \| Eloctate
Disclosure of geographical areas [line items]
Net sales	65	59
Other countries \| Biopharma \| General Medicines
Disclosure of geographical areas [line items]
Net sales	3,296	3,767
Other countries \| Biopharma \| Core Assets
Disclosure of geographical areas [line items]
Net sales	1,409	1,454
Other countries \| Biopharma \| Lovenox
Disclosure of geographical areas [line items]
Net sales	273	354
Other countries \| Biopharma \| Toujeo
Disclosure of geographical areas [line items]
Net sales	241	202
Other countries \| Biopharma \| Plavix
Disclosure of geographical areas [line items]
Net sales	424	451
Other countries \| Biopharma \| Non-Core Assets
Disclosure of geographical areas [line items]
Net sales	1,874	2,304
Other countries \| Biopharma \| Lantus
Disclosure of geographical areas [line items]
Net sales	429	623
Other countries \| Biopharma \| Other non-core assets
Disclosure of geographical areas [line items]
Net sales	1,274	1,481
Other countries \| Biopharma \| Industrial sales
Disclosure of geographical areas [line items]
Net sales	13	9
Other countries \| Biopharma \| Vaccines
Disclosure of geographical areas [line items]
Net sales	1,163	1,199
Other countries \| Biopharma \| Polio/Pertussis/ Hib Vaccines
Disclosure of geographical areas [line items]
Net sales	806	817
Other countries \| Biopharma \| Influenza Vaccines
Disclosure of geographical areas [line items]
Net sales	106	132
Other countries \| Consumer Healthcare
Disclosure of geographical areas [line items]
Net sales	1,258	1,217
Other countries \| Consumer Healthcare \| Allergy
Disclosure of geographical areas [line items]
Net sales	151	148
Other countries \| Consumer Healthcare \| Pain Care
Disclosure of geographical areas [line items]
Net sales	216	218
Other countries \| Consumer Healthcare \| Digestive Wellness
Disclosure of geographical areas [line items]
Net sales	€ 460	€ 412