Bloomberg reported that the Federal Reserve approved new standards for foreign banks that will require the biggest to hold more capital in the U.S., joining other countries in erecting walls around domestic financial systems.

Bloomberg said that banks with $50 billion of assets in the U.S. will have to meet the standard under a revised rule, which raised the threshold from $10 billion proposed in 2012. The central bank left out two controversial elements of the original proposal, saying those were still being developed.

Bloomberg noted that walling off U.S. units of foreign banks, designed to protect taxpayers from having to bail them out in a crisis, may increase those companies’ borrowing costs and hurt their profitability. According to Bloomberg, the firms say it will also raise borrowing rates for governments and consumers.

To read the entire Bloomberg story, click here.