WASHINGTON (AP) — A sweeping bank regulatory proposal will be significantly revised by year’s end, Federal Reserve Chair Jerome Powell said Thursday, a potential victory for the large banks that have aggressively opposed the likely changes. The proposed rule, issued last summer by the Fed and other regulatory agencies, is intended to implement changes that were negotiated internationally after the 2008 global financial crisis. Among other things, the rule would require the largest banks — those with more than $100 billion in assets — to hold more funds in reserve to protect against bad loans and other potential losses. Large banks have resisted the proposal, which they say would limit their ability to lend.