The boilerplate divorce petition showed the pair had already entered a "prenuptial agreement, separation contract, or community property agreement."
The paperwork and the exact details of how their massive fortune will be divided was not included in the court record Thursday.
Scott, 52, has a net worth of $33.8 billion, Forbes magazine has estimated.
The pair now have to wait 90 days from Monday's filing date under Washington law for the divorce to become final.
The 90-day countdown means the split could become official as soon as the final week of December — and it could allow Scott and Jewett to file their 2022 federal taxes as individuals, University of Washington law professor Terry Price said.
"I have no doubt that some very highly competent tax lawyers have advised her about this. There could be some benefit to that or some business strategy to it," Price, who teaches family law, said Thursday.
"When you're a billionaire, these things are not accidental. I feel really, really certain of that."
Jewett, a former Seattle science teacher, and his lawyer could not immediately be reached for comment Thursday.