Financial Risk Management and Financial Instruments - Summary of Immediate Impact on Net Loss Before Tax (Details) kr in Millions, $ in Millions |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2019
USD ($)
|
Dec. 31, 2019
SEK (kr)
|
Dec. 31, 2018
USD ($)
|
|
| Disclosure Of Financial Instruments [Abstract] | |||
| (Increase)/decrease in loss before tax | $ 121 | kr (13) | $ 74 |