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N-2 - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended
Mar. 31, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Cover [Abstract]            
Entity Central Index Key 0001635977          
Amendment Flag false          
Document Type N-CSRS          
Entity Registrant Name Tekla World Healthcare Fund          
Financial Highlights [Abstract]            
Senior Securities Amount $ 120 $ 120 $ 120 $ 120 $ 120 $ 120
Senior Securities Coverage per Unit $ 4,997 $ 4,786 $ 5,714 $ 4,554 $ 4,396 $ 4,861
General Description of Registrant [Abstract]            
Annual Dividend Payment 0.7          
Share Price [1] 13.74          
NAV Per Share [2] $ 12.64          
Latest Premium (Discount) to NAV [Percent] 8.70%          
Capital Stock, Long-Term Debt, and Other Securities [Abstract]            
Outstanding Security, Held [Shares] 37,945,713          
[1] The closing price at which the Fund's shares were traded on the exchange.
[2] Per-share dollar value of the Fund, calculated by dividing the total value of all the securities in its portfolio, plus any other assets and less liabilities, by the number of Fund shares outstanding.