Lafarge, which became part of Swiss-listed Holcim (HOLN.S) in 2015, agreed to pay $778 million in forfeiture and fines as part of the plea agreement.
"Lafarge made a deal with the devil," Breon Peace, the top federal prosecutor in Brooklyn, told reporters following the guilty plea.
At that point, Islamic State took possession of the remaining cement and sold it for the equivalent of $3.21 million, prosecutors said.
REUTERS/Charles PlatiauHolcim said that former Lafarge executives involved in the conduct concealed it from Holcim, as well as from external auditors.
No Lafarge executives were charged in the United States.