Vice President Kamala Harris has raised $1 billion in less than three months as a presidential candidate, according to three people with knowledge of her fund-raising haul, a remarkable sum that has remade the race against former President Donald J. Trump.

The $1 billion haul, which encompasses money raised for her campaign and affiliated party committees, including the Democratic National Committee, is being spent on a wave of television and digital advertising and an expansive operation of offices and staff in the seven battleground states and beyond. The historic sum does not include money donated to allied super PACs.

The Harris campaign declined to comment. The campaign has yet to announce how much it raised in September, partly out of concern that bragging about the gush of donations could diminish donor interest in the race’s final weeks, people briefed on the strategy said. The Harris campaign also remains concerned about the ability of billionaire-funded Republican super PACs to impact the race.

The federal reports detailing the fund-raising totals for September are required to be made public later this month.

The $1 billion threshold is more than Mr. Trump has announced raising in all of 2024. He has raised around $853 million this calendar year in concert with the party, according to a tally of his campaign’s public statements.

Past presidential candidates, including Joseph R. Biden and Mr. Trump four years ago, have raised more than $1 billion together with their parties. Mr. Trump announced that he had surpassed that mark in July 2020, after he had been raising funds for his re-election for multiple years.

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