Detroit ? Of all the words in General Motors Corp.’s 402-page annual report, none is more jarring than two written by the company’s auditors: “substantial doubt.”

The doubt, according to Deloitte & Touche LLC, is about whether GM can overcome its staggering losses and generate enough cash to stay in business, or remain a “going concern” as accountants would say.

GM concedes in the report filed Thursday that it’s on the edge of bankruptcy and won’t be able to avoid it unless it gets more government money and successfully executes a huge restructuring plan.

It’s no surprise that auditors would question GM’s viability. The Detroit-based behemoth lost $30.9 billion last year, is living on $13.4 billion in government loans, and is seeking up to $30 billion as it tries to survive the worst auto sales climate in 27 years.