According to financial projections released as part of the Xbox data leaks, Bethesda expected to make almost $1 billion on Starfield.
That estimate comes over a four-year span. In year one, the company projected $600 Million followed by $215 Million in year two. Years three and four see the numbers fall a bit as the games lifecycle moves on with projections of $50 million and $35 million, respectively.

Source: N4G PC Bethesda Expected To Make Almost Billion On Starfield