Lincoln National Corporation, through its subsidiaries, operates multiple insurance and retirement businesses in the United States. It operates through four segments: Annuities, Retirement Plan Services, Life Insurance, and Group Protection. The Annuities segment offers variable, fixed, and indexed variable annuities. The Retirement Plan Services segment provides employers with retirement plan products and services primarily in the defined contribution retirement plan marketplace. This segment offers individual and group variable annuities, group fixed annuities, and mutual fund-based programs; and a range of plan services, including plan recordkeeping, compliance testing, participant education, and trust and custodial services. The Life Insurance segment provides life insurance products, including term insurance, such as single and survivorship versions of universal life insurance; variable universal life insurance; indexed universal life insurance products; and critical illness and l