In remarks to the finance officials released by Treasury, Lew said that the United States understood the role it plays as "the anchor of the international financial system." He said the administration is continuing to push Congress to reopen the government and increase the borrowing limit.
"Prior to the government shutdown, all signs pointed to the strengthening recovery of the U.S. economy," Lew said. "If Congress acts quickly, this will continue to be the case."
There have been various proposals in recent days to resolve the impasse and get at least a short-term increase in the borrowing limit approved before next week's deadline. Obama has insisted he will not negotiate with Republicans over spending issues until the government is reopened and the borrowing limit is raised.
Siluanov said the G-20 officials did not discuss contingency plans if the U.S. borrowing ceiling is not increased by the Thursday deadline. He had told reporters after a G-20 dinner meeting the previous evening that U.S. officials had given assurances that the debt ceiling would be resolved before the deadline. However, U.S. officials said Friday that there didn't provide such an assurance but merely expressed the hope Congress would act.
"There are no emergency or extraordinary plans," Siluanov said. "In the course of today's meeting, no plans were drawn up. No worst-case scenario was discussed. We trust the U.S. authorities will find a way out of this complex situation."
Siluanov said that Russia was not considering reducing the size of its U.S. Treasury holdings, saying those investments were for the long term while the debt crisis was a short-term issue.
Other finance officials expressed similar optimism, some noting that this would not be the first time the United States has come to the brink of a default crisis and a solution has been found at the last minute.
Japan's Finance Minister Taro Aso told reporters at a news conference that he conveyed to Lew his country's expectation the debt ceiling would be extended soon, "once and for all without any delay."
The G-20 communique said it would be important for countries that have benefited from ultra-low interest rates to pursue prudent economic policies and put in place structural reforms to bolster their financial systems as interest rates in the United States and elsewhere returned to more normal levels. Large outflows of investments this summer have destabilized some emerging economies such as India and Indonesia.
Aso said he agreed with the view in the communique that that monetary policy in major economies needed to be "carefully calibrated and clearly communicated."
The G-20 discussions were being held in advance of Saturday meetings of the 188-nation International Monetary Fund and its sister lending organization, the World Bank.
The talks were something of a farewell for Bernanke, who was attending his last G-20 meeting, and a coming out for Janet Yellen, who was tapped this week by Obama to succeed Bernanke as head of the Fed. Yellen was expected to participate in some of the Saturday discussions.
The G-20 represents around 85 percent of the global economy. It includes established industrial nations such as the United States, Germany and France and rapidly growing emerging market economies such as China, Brazil and India.
The finance meetings are being held at a time growth in emerging market economies has cooled and some of them have struggled to contain the fallout from worries over rising interest rates if the Federal Reserve begins trimming its bond purchases.
IMF Managing Director Christine Lagarde warned on Thursday that a failure by the United States to increase its borrowing limit could do deep damage to both the American and global economies.
"Obviously, we know, and you know by now, that failure to raise the debt ceiling would cause not only serious damage to the U.S. economy but also to the global economy as a result of the spillover effects," Lagarde told reporters at a news conference. "It is not helping the U.S. economy to have this uncertainty and this protracted way of dealing with fiscal issues and debt issues."
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Associated Press reporters Harry Dunphy and Matthew Pennington contributed to this report.