Israel has for a decade received billions from the US in addition to munitions. If the latest offer is not paid until a settlement then it is an empty offer for Israel - except for the promise to block the Palestinians. The offer however is an affront to the Palestinians. But, what 20 billion is Abbas referring to?
Netanyahu at Holocaust memorial ceremony: Nazis slandered Jews before destroying them (Haaretz)
from the article: Abbas in Cairo to discuss U.S. settlement freeze offer to Israel