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Equity-based compensation - Additional information (Details)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 08, 2019
shares
Mar. 31, 2020
metric
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
$ / shares
Dec. 31, 2017
USD ($)
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Equity-based compensation expense | $       $ 114 $ 93 $ 71
Accrued share-based payments | $     $ 10 $ 10 $ 6  
Number of awards issued/granted (in shares) 4,200   700      
Number of awards outstanding (in shares) 4,222   4,742 4,742 3,443 2,800
Number of awards vested (in shares)     108   814  
Number of awards forfeited (in shares)     114   208  
Remaining weighted-average vesting period       1 year 6 months    
Chief executive officer [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Percent paid in cash     50.00% 50.00%    
Percent paid in equity shares     50.00% 50.00%    
Top leaders [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Percent paid in cash     70.00% 70.00%    
Percent paid in equity shares     30.00% 30.00%    
Long-term Incentive Plan [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Vesting period       3 years    
Number of metrics | metric   4        
Restricted awards [Member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Number of awards issued/granted (in shares)     625      
Vesting period       3 years    
Novartis equity plan select, outside North America [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Number of awards issued/granted (in shares)         141  
Weighted average share price (in dollars per share) | $ / shares         $ 86.2  
Novartis equity plan select, North America [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Number of awards issued/granted (in shares)         689  
Weighted average share price (in dollars per share) | $ / shares         $ 81.4  
Minimum [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Share savings plan holding period       3 years    
Minimum [member] | Long-term Incentive Plan [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Target incentive percent of base salary       30.00%    
Payout percent       0.00%    
Maximum [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Share savings plan holding period       5 years    
Maximum [member] | Long-term Incentive Plan [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Target incentive percent of base salary       280.00%    
Payout percent       200.00%