The company told the US Securities and Exchange Commission Wednesday that it was "reasonably probable" the merger would achieve savings of $170 million per year by 2020 for the combined company.

That is substantially lower than previous projections of $2 billion per year.

In an effort to reduce costs, the companies plan to consolidate their corporate offices in Dallas. This consolidation will "significantly reduce" Williams' presence in Tulsa, Oklahoma, where the company is based.

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