Ride-hailing giant Uber's full-year net loss widened to $US4.5 billion in 2017 as the company endured a tumultuous year that included multiple scandals, a lawsuit alleging the theft of trade secrets, and the replacement of its CEO.

Ride-hailing giant Uber's full-year net loss widened to $US4.5 billion in 2017 as the company endured a tumultuous year that included multiple scandals, a lawsuit alleging the theft of trade secrets, and the replacement of its CEO.