The central bank's top regulator said public comments about the new tool, used to gauge capital strength during stress tests, will likely result in changes before it is adopted.
The new approach would replace the "current exposure methodology" that banks typically use to calculate what they owe or are owed in swaps, futures or options contracts.
Donald Layton, who has run the mortgage giant since 2012, discussed the busy agenda leading up to his departure and says Freddie can serve as a "technical adviser" in GSE reform talks.
The heavy workload is not limited to implementing the financial regulatory reform bill enacted last spring, as the agencies also work to craft reforms of the Community Reinvestment Act and adjust key capital measures for the biggest banks.
Large retailers want the right to reject rewards cards at the point of sale to avoid higher swipe fees; Germany's financial regulator appoints an auditor to monitor the Deutsche Bank's progress.
The changes mandated by the recent regulatory relief law would narrow the definition of "high-volatility commercial real estate" exposures that get a higher risk weight.
A top regulator has signaled that the banking agencies are receptive to extending the comment deadline, after banks raised concerns about a proposed revision to the ban on proprietary trading.
With strategic changes at key trade groups and attention shifting away from regulatory relief for community banks, the interests of large institutions have taken on more prominence.