Noun
a team, either privately hired or working for a government, that is assigned to provide personal security for an individual or group
Used other than figuratively or idiomatically: see security, detail.
Source: en.wiktionary.orgPeople have criticised me because my security detail is larger than the president's. But you must ask yourself: are there more people who want to kill me than who want to kill the president? I can assure you there are. Marion Barry