General Motors filed for Chapter 11 bankruptcy protection Monday as part of the Obama administration's plan to shrink the automaker to a sustainable size and give a majority ownership stake to the federal government.

GM's bankruptcy filing is the fourth-largest in U.S. history and the largest for an industrial company. The company said it has $172.81 billion in debt and $82.29 billion in assets.

As it reorganizes, the fallen icon of American industrial will rely on $30 billion of additional financial assistance from the Treasury Department and $9.5 billion from Canada. That's on top of about $20 billion in taxpayer money GM already has received in the form of low-interest loans.