Amr bin Shu'ayb (may Allah have mercy on him) narrates from his father, and he from his grandfather (may Allah be pleased with him), that the Messenger of Allah (peace and blessings be upon him) said: "The diyah (blood money) of a disbeliever, whether a Jew or a Christian, is half that of a Muslim."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الديات / 16345