Al-Akoub said $42 billion was needed for his province alone, as it is home to Mosul. Iraq needs some $20 billion now to begin its reconstruction, al-Hiti said.
The war against the Islamic State group displaced more than 5 million people. Only half have returned to their hometowns in Iraq.
However, officials acknowledge a feeling of fatigue from international donors, especially after the wars in Iraq and Syria sparked the biggest mass migration since World War II.
President Donald Trump himself on Monday tweeted that America was "so stupidly spending $7 trillion in the Middle East, it is now time to start investing in OUR country." The U.S. has no plans to make any new pledges at this week's conferences. Even in Kuwait, some social media users questioned why more wasn't being done in their own country.
Billions of dollars poured into Iraq after the 2003 U.S.-led invasion that toppled dictator Saddam Hussein, with what feels now like little visible effect.
The U.S. alone spent $60 billion over nine years — some $15 million a day — to rebuild Iraq. Around $25 billion went to Iraq's military, which disintegrated during the lightning 2014 offensive of the Islamic State group, which grew out of al-Qaida in Iraq. U.S. government auditors also found massive waste and corruption, fueling suspicions of Western politicians like Trump who want to scale back foreign aid.