The network is planning 3,600 hours of TV and Internet coverage of the 17-day event, which begins with the opening ceremony Friday.
NBC says it has made significant profits from the Olympics since the 1996 Summer Games in Atlanta.
The network has owned the US broadcast rights for every Games since then, except for the 1998 Winter Games in Nagano, Japan, which were bought by CBS for $375 million.
NBC spent a total of $2 billion for the rights to the 2010 Winter Games in Vancouver and the 2012 Summer Games in London.