The 100 Leading National Advertisers ranking by Ad Age is available for 2010 spending.  The LNA ranking is based on estimated total U.S. ad spending, consisting of spending in measured media ( as tracked by Kantar) plus unmeasured media spending (as estimated by Ad Age).

In at #19 is Macy's.  Co-operative advertising allowances from Macy's vendors paid for $345 million or 24% of Macy's 2010 $1.4 billion gross advertising costs.  Macy's receives Co-op ad money from more than 1,000 vendors. (source: Ad Age 6.20.11)