The Truman Doctrine was primarily an offer of aid to any country willing to resist communism and needing help to do it.
The Marshall Plan allocated 13 billion dollars to the European countries most devastated by WWII. It took Great Britain 61 years to repay their share of the Marshall plan back to the US. Britain owed about 3 billion but you can see how much 3 billion was worth if it took that long to repay.
The two American policies had this in common: both were intended to halt the spread of Communism.
