The company offers consulting services in the areas of health and benefits, global benefits, retirement, investment consulting, compensation, talent and organization, communication, and mergers and acquisitions; benefits administration, such as corporate health exchange, defined benefit plan administration, defined contribution plan administration, health and welfare plan administration, and post-65 retiree health care exchange; and human resource (HR) business process outsourcing services.

It also provides administrative services, such as workforce administration, payroll, total rewards, learning and development services, performance management services, recruitment process and staffing outsourcing, 360º absence solutions, flexible spending account administration, dependent verification services, advocacy services, compliance services, supplier management, executive workforce analytics, specialized HR solutions, and retirement and financial services. In addition, the company offers LEADeR(R), a suite of assessment tools that enable organizations to measure and assess managers' readiness for leadership roles; and deploys SaaS-based Workday solutions for human resources, payroll, financial management, and worker spending.

Aon Hewitt LLC was formerly known as Hewitt Associates, Inc. and changed its name to Aon Hewitt LLC in October 2010. As of October 1, 2010, Aon Hewitt LLC operates as a subsidiary of Aon plc.