What plan was to rebuild not only the winners but the losers of world war ii to spread peace

The correct answer is: "the Marshall Plan".

The Marshall Plan was a US foreign policy enacted in 1948 and which consisted on directing financial aid to rebuild Western European countries, both winners and losers of WWII. Such reconstruction aimed to boost Western economies by providing money to rebuilt their infraestructure.

Every country in Western Europe would receive such funds, as long as they positioned themselves as allies in the US fight against the spread of communism, after the Soviet Union had extended its influence over most countries in Eastern Europe.

punish germany and keep it weak,

payments were made after the 1940s.

in the 1980s, a commission held investigations and made recommendations.