Regulators also will unveil a separate proposal governing how much money swaps buyers and sellers must set aside when they make trades outside central clearing houses. The rules from the Federal Reserve, Federal Deposit Insurance Corp (FDIC) and Office of the Comptroller of the Currency (OCC) are part of a series of reforms aimed at making banks sturdier and heading off another economic meltdown. The liquidity rules, which call for big banks to hold enough liquid assets to meet their cash needs for 30 days, are a key pillar of the international agreement known as Basel III.