Fannie Mae and Freddie Mac this week announced the final piece of a multiyear process to relieve seller anxiety about potential buybacks, an independent dispute-resolution process for the most difficult to resolve repurchase demands. As a last resort, the new IDR process may not see that much activity, especially since seller repurchases of government-sponsored enterprise mortgages have been declining sharply. For a buyback dispute to get to a final determination by a third-party arbitrator, it will have to go through three normal steps in the buyback process. The IDR process began...[Includes one data table]