Housing risk
The $236 billion is a 12-month flow, but the total stock of Fannie and Freddie obligations guaranteed by the government is $5 trillion. This guarantee is real and indubitable, although not formal. It artificially stimulates housing, induces higher leverage in the housing finance sector, and diverts resources to houses.
Both the mortgage-interest deduction and the guarantee of Fannie and Freddie get capitalized into house prices, pushing them higher and making them less affordable for the next generation, which is the opposite of their supposed purpose.