Cost of Sales: 272,344
Fulfillment: 75,111
Technology and Content: 73,213
Sales and Marketing: 32,551
General and Administrative: 8,823
Other Operating Expense (Income), Net: 62
So Technology and Content is the $73bn number.
I think Fulfillment covers warehouse and delivery costs.
I get that they have high R&D costs but I'm still trying to get my head around how that money is being spent.