Michael A. Carpenter, GMAC's newly installed chief executive, says his top priority is to stop its troubled mortgage unit from dragging down the rest of the $178 billion-asset company.

Carpenter, a former senior executive at Citigroup, said he is looking at "every conceivable alternative," including bankruptcy, for Residential Capital (ResCap). The unit, which has lost $9.2 billion over the last eight quarters, is the main reason GMAC has taken $12.5 billion of federal capital and was seeking as much as $5.6 billion more before the management shake-up this week.

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