The American International Group, which has received more than $170 billion in taxpayer bailout money from the Treasury and Federal Reserve, plans to pay about $165 million in bonuses by Sunday to executives in the same business unit that brought the company to the brink of collapse last year. Treasury Secretary Timothy F. Geithner told the firm they were unacceptable and demanded they be renegotiated, a senior administration official said. But the bonuses will go forward because lawyers said the firm was contractually obligated to pay them. The payments to A.I.G.'s financial products unit are in addition to $121 million in previously scheduled bonuses for the company's senior executives and 6,400 employees across the sprawling corporation. The payment of so much money at a company at the heart of the financial collapse that sent the broader economy into a tailspin almost certainly will fuel a popular backlash against the government's efforts to prop up Wall Street. A.I.G., nearly 80 percent of which is now owned by the government, defended its bonuses, arguing that they were promised last year before the crisis and cannot be legally canceled. Of all the financial institutions that have been propped up by taxpayer dollars, none has received more money than A.I.G.. The bonuses will be paid to executives at A.I.G.'s financial products division, the unit that wrote trillions of dollars' worth of credit-default swaps that protected investors from defaults on bonds backed in many cases by subprime mortgages. Seven executives at the financial products unit were entitled to receive more than $3 million in bonuses.