Chuck Blazer, the former Fifa official turned government witness, took bribes over a period of almost 20 years to sway the selection of two World Cups and five regional tournaments, according to court documents unsealed on Wednesday.
The partly redacted 40-page transcript of Mr Blazer's guilty plea before a US judge in 2013 was released after news organisations petitioned the court to make it public.
The unsealing came one day after Sepp Blatter, Fifa's longtime president, resigned against the backdrop of a corruption scandal that has led to the indictment of nine of the organisation's officials.
Mr Blazer is a former general secretary of Concacaf, the football body for North America, Central America and the Caribbean.