"It has to be measured by whether people have jobs and economic opportunity, whether they believe their government is serving their needs, whether political reconciliation proceeds and succeeds."
US officials said they would ask Congress to keep funding "at or near" the past decade's levels. This year America's aid budget to Afghanistan stands at $2.3 billion.
Britain has already said it will keep annual aid at £178 million until 2017. The EU has said it will continue to give 1.2 billion euros a year.
Omar Zakhilwal, Afghanistan's Finance Minister, said the conference had shown donors were committed to the long haul.
"Today's event sends the strongest message to Afghan people that the international community will be with us in 2014, 2015, 2017, 2020 and beyond," he said.
Afghanistan's weak state is totally reliant on foreign aid to pay its bills and build infrastructure. As well as the money pledged in Tokyo, Nato is trying to find $4.1 billion a year to keep the Afghan army and police going after 2014.
Meanwhile Taliban roadside bombs and insurgent attacks killed 16 Afghan civilians, five policemen and two members of the Nato-led coalition, officials said Sunday.
