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Equity (Details 2) - CHF (SFr)
shares in Millions, SFr in Billions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of classes of share capital [line items]      
Number of shares outstanding at beginning of period 2,265.0 2,311.2 2,317.5
Treasury shares acquired to be cancelled (32.6) (60.3) (23.3)
Other share purchases (1.7) (1.7) (1.2)
Exercise of options and employee transactions shares 14.7 5.5 7.8
Equity based compensation shares 11.0 9.4 7.4
Shares delivered to divested business employees 0.4 0.9  
Other share sales     3.0
Total movements (8.2) (46.2) (6.3)
Number of shares outstanding at end of period 2,256.8 2,265.0 2,311.2
Shares repurchased on the SIX Swiss Exchange second trading line under the share buyback authority approved SFr 10 SFr 10 SFr 10
Total Novartis shares      
Disclosure of classes of share capital [line items]      
Number of shares issued at beginning of period 2,527.3 2,550.6 2,616.8
Shares cancelled for capital reduction (60.3) (23.3) (66.2)
Total movements (60.3) (23.3) (66.2)
Number of shares issued at end of period 2,467.0 2,527.3 2,550.6
Total treasury shares      
Disclosure of classes of share capital [line items]      
Number of treasury shares at beginning of period (262.3) (239.4) (299.3)
Shares cancelled for capital reduction 60.3 23.3 66.2
Treasury shares acquired to be cancelled (32.6) (60.3) (23.3)
Other share purchases (1.7) (1.7) (1.2)
Exercise of options and employee transactions shares 14.7 5.5 7.8
Equity based compensation shares 11.0 9.4 7.4
Shares delivered to divested business employees 0.4 0.9  
Other share sales     3.0
Total movements 52.1 (22.9) 59.9
Number of treasury shares at end of period (210.2) (262.3) (239.4)
Treasury shares with restricted use 103.0 117.6 121.6