Already a flash point of controversy over its online bank's high deposit rates and negative advertising, GMAC is now ruffling feathers by cutting back on disclosures about its troubled mortgage arm.

On a conference call Wednesday to discuss third-quarter results, the finance company, 35% owned by the government, said it would no longer provide separate quarterly or annual reports for Residential Capital. The Securities and Exchange Commission does not require it to do so, since only 300 investors hold ResCap's $4 billion of debt. GMAC's chief financial officer, Robert Hull, said the change will save it a "tremendous" amount of money, though he did not specify how much.

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