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Segment information - Segment contribution and reconciliation to income/(loss) before taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2022
Sep. 30, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments [line items]          
Total segment contribution     $ 2,231 $ 1,936 $ 1,788
Amortization of intangible assets     (745) (653) (590)
Impairment charges on intangible assets $ (61)   0 (62) (225)
General & administration (corporate)     (272) (255) (251)
Separation costs     0 0 (36)
Transformation costs     (139) (119) (68)
Fair value adjustments to contingent consideration liabilities     17 23 42
Past service costs for post-employment benefit plan amendments     0 0 18
Acquisition and integration related costs     (48) (64) 0
Release of contingent liability related to a recent acquisition     58 0 0
Other     (63) (134) (98)
Operating income     1,039 672 580
Interest expense     (189) (134) (120)
Other financial income & expense     (18) (75) (42)
Income before taxes     832 463 418
Total depreciation of property, plant & equipment     (385) (330) (323)
Total depreciation of right-of-use assets     (91) (76) (81)
Total impairment charges on property, plant & equipment, net     0 (2) 0
Total equity-based compensation     (159) (152) (151)
Not allocated to segments          
Disclosure of operating segments [line items]          
Total depreciation of property, plant & equipment     (4) (1) 0
Total equity-based compensation     (17) (17) (17)
Surgical          
Disclosure of operating segments [line items]          
Total segment contribution     1,454 1,336 1,184
Impairment charges on intangible assets   $ (178) 0 (60)  
Surgical | Operating segments          
Disclosure of operating segments [line items]          
Total depreciation of property, plant & equipment     (144) (131) (129)
Total depreciation of right-of-use assets     (49) (46) (50)
Total impairment charges on property, plant & equipment, net     0 (2) 0
Total equity-based compensation     (78) (74) (74)
Vision Care          
Disclosure of operating segments [line items]          
Total segment contribution     777 600 604
Impairment charges on intangible assets     0 (2) (47)
Vision Care | Operating segments          
Disclosure of operating segments [line items]          
Total depreciation of property, plant & equipment     (237) (198) (194)
Total depreciation of right-of-use assets     (42) (30) (31)
Total equity-based compensation     $ (64) $ (61) $ (60)