Social Security [...] refers to the Federal Old-Age, Survivors, and Disability Insurance (OASDI) program. [This] social insurance program [is] funded through dedicated payroll taxes called Federal Insurance Contributions Act (FICA). Tax deposits are formally entrusted to Federal Old-Age and Survivors Insurance Trust Fund, or Federal Disability Insurance Trust Fund, Federal Hospital Insurance Trust Fund or the Federal Supplementary Medical Insurance Trust Fund. The main part of the program is sometimes abbreviated (OASDI), in reference to its three beneficiaries (OA for retirement, S for widows and survivors income, D for the disabled, and I for insurance). [...] In 2004 the U.S. Social Security system paid out almost $500 billion in benefits. By dollars paid, the U.S. Social Security program is the largest government program in the world.

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