Authorities estimate Iraq needs USD 88.2 billion to restore a country smashed after the Sunni extremists seized the country's second-largest city of Mosul and a mass of territory in June 2014.
"We finished one battle but we are engaged now with a war for reconstruction," said Mustafa al-Hiti, the head of Iraq's reconstruction fund for areas affected by terrorist operations.
Among the hardest-hit areas is Mosul, which Iraqi forces, aided by Iranian-backed Shiite militias and a US-led coalition, recaptured in July 2017.
Of the money needed, Iraqi officials estimate USD 17 billion alone needs to go toward rebuilding homes, the biggest single line item offered today on the first day of meetings.
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The United Nations estimates 40,000 homes need to be rebuilt in Mosul alone.
"The majority of the damage was to western Mosul as it went through one of the worst and fiercest battles in history," said Nofal al-Akoub, the governor of Iraq's Nineveh province. It "led to the total destruction of its infrastructure."
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 today tweeted that America was "so stupidly spending USD 7 trillion in the Middle East, it is now time to start investing in OUR country." Even in Kuwait, some social media users questioned why more wasn't being done in their own country.
The US alone spent USD 60 billion over nine years, some USD 15 million a day, to rebuild Iraq.
Around USD 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.
US government auditors also found massive waste and corruption, fueling suspicions of Western politicians like Trump who want to scale back foreign aid.
Meanwhile, the Middle East as a whole, especially countries like Kuwait whose deep pockets rely on oil production, have taken a hit in recent years as energy prices crashed and only recently began regaining ground.
That money is desperately needed as more than 4 million children are in need of humanitarian assistance while 3 million are unable to regularly go to school in Iraq, said Geert Cappelaere, UNICEF's regional director for the Middle East and North Africa.
One out of four Iraqi children across the country live in poverty in the nation of 37 million people.
But Iraq needs more than just cash as thousands remain held after the rout of the Islamic State group, including women and children.
It must renew its embrace of the rule of law, as well as provide answers to families whose loved ones went missing in the war, said Katharina Ritz, the head of the delegation in Iraq for the International Committee of the Red Cross.
"This will take time and probably it will also take generations to deal with the past, because if you look at the future, you also have to look back," she added.