General Motors Corp. and Chrysler LLC told the federal government they need at least $21.6 billion more combined in bailout loans to put them on the road to recovery, and outlined possible scenarios if either auto maker should have to file for bankruptcy protection.

Both GM and Chrysler, in the recovery plans submitted Tuesday to the U.S. Treasury, argue that bankruptcy would be more costly and drawn out than government-funded restructurings.

GM said it might need as much as $100 billion in financing from the government if it were to go through the traditional bankruptcy process. Rick Wagoner, GM’s chairman and chief executive, said the bankruptcy scenarios are “risky” and “costly” and would only be pursued as a last resort.

Chrysler’s plan said the company would likely have to file for Chapter 11 protection if it doesn’t get additional loans from the government and concessions from unions, creditors and dealers. It said it would need $24 billion in financing if the company were to file for bankruptcy. But company officials said in a conference call that they believe a Chapter 11 filing is “not necessary” for Chrysler’s survival.