How much money do large corporations spend for advertising?

I know it depends on the size of the corporation but can someone give an estimate? What percentage is usually reserved for an advertising budget? How much does mcdonalds spend on advertising? How much does pepsi spend on advertising?
Oh and please specify per time frame (per month, per year, per fiscal quarter, etc)

I was in a business seminar at Sports Illustrated and some of their full page advertisements run about 750,000 to 1,000,000 per company. However, if it is a small or emerging company Sports Illustrated might cut them a break or give them a half page. It might sound like a lot but it is hitting a lot of people. It probably boils down to less than a dollar per person due to all subscribers.. Hope that example helped