The German government backed a 750 billion euro (nearly $1 trillion) rescue package for Europe's troubled currency union as European Union officials readied tougher oversight over budgets and economies of most member countries in an effort to contain the region's troubling debt crisis.

The startling size of the EU package, agreed early Monday, initially lifted the euro and stock markets, but by Tuesday the euphoria had ebbed on concerns that simply making more loans available didn't address the crippling levels of government debt in countries such as Greece and Portugal.

The euro slipped to $1.2670 in European trading — down from $1.2804 in New York late Monday.

Germany, Europe's richest nation which only reluctantly backed the deal, has demanded that Greece and other countries that use the euro must make sharp spending cuts to curb runaway deficits and public debt in return for financial help.

The Greek debt tragedy has become Germany's burden because Berlin will provide the largest chunk of the euro zone rescue package available to all countries if they need it — at least 123 billion euros ($156.79 billion) — and a separate bailout for Greece agreed earlier which did little to halt the crisis. Germany's share of that is 22.3 billion euros.

The idea of shouldering the debts of less thrifty countries is unpopular with frugal German voters who showed their disapproval of Chancellor Angela Merkel by voting her party out of power in a key state election on Sunday.

The German parliament will now need to debate and vote by June 4 on the euro zone rescue. Opposition lawmakers voiced dissatisfaction over the package, which troubles even some of Merkel's own advisers.

Merkel has tried to couple her backing of the unprecedented bailouts for spendthrift euro zone nations with calls for them to shape up their finances — or ship out of the euro.

The EU's executive commission will lay out the first step toward stricter budget controls on Wednesday when it will overhaul existing EU rules intended to prevent debt troubles. Most euro nations — including Germany — have at one time or another trampled on by ignoring debt and deficit limits.

EU Commission President Jose Manuel Barroso has called for EU oversight to go further and monitor how EU economies are performing.

"We cannot have a monetary union without an economic union," he said Monday. "The solution of this problem has been more coordinated Europe, more coherence, economic policy coordination."

Barroso said he would also suggest a permanent crisis management plan that could eventually replace the 750 billion euro ($955.67 billion) package of loans and debt guarantee that EU governments agreed early Monday for any member country that can't pay its debts over the next three years.

Greece will Tuesday request a 14.5 billion euro ($18.48 billion) loan from a European Union-led bailout fund totaling 110 billion euros agreed last week, officials in Athens said. It will also receive a 5.5 billion euro ($7.01 billion) loan from the International Monetary Fund on Wednesday.

Athens needs the money by May 19 to extend some 9 billion euros ($11.47 billion) in debt, part of a soaring debt mountain that has worried financial markets and triggered a slide in the value of the euro and higher borrowing costs for Greece and other vulnerable euro zone nations.

French Finance Minister Christine Lagarde defended the currency as "solid" on Tuesday, saying European leaders had finally decided to turn vague political promises into a firm financial pledge after seeing that institutional investors — such as pension funds — were losing confidence in the euro last week.

Investors are still concerned that Germany may not approve the final package. German opposition leaders said they were worried that Germany's final bill could climb. Merkel told them Monday that it could go up to 150 billion euros.

Juergen Trittin of the Greens and Gregor Gysi of the Left Party said they were worried that it was unclear how much German taxpayers would be ultimately on the hook for.