Prosecutors want 35-year term in Mumbai attack
But the court documents also highlight how Headley agreed to talk almost immediately after his arrest at O'Hare International Airport in Chicago, even after he was told his answers could lead to his conviction for crimes that call for the death penalty.
His sentencing hearing is scheduled for Thursday.
Under his 2010 deal with prosecutors, Headley agreed to plead guilty and cooperate in exchange for a promise that he would not face the death penalty or be extradited to India.
Tuesday's filing offers few specifics but says Headley helped shed light on Lashkar's structure, leadership, other planned attacks and potential targets. It also said he provided valuable information about Ilyas Kashmiri, al-Qaida's former military operations chief in Pakistan who was reportedly killed in a drone strike in 2011.
Headley also submitted to interviews by Indian authorities for seven days, the filing states.
"Headley answered their questions without any restriction, and the government understands that the Indian government found the information to be useful," the court filing states.
Associated Press writer Herb McCann contributed to this report from Chicago.
Follow Michael Tarm at www.twitter.com/mtarm
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