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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% |  |

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