Value of products sold by Amazon in all markets. This doesn't include marketplace sales, which can be expected to be 1.5-2x of net sales value.
Last reported quarter 2019 Q2 it was $35.86 billion, up by 13% year-over-year from $31.86 billion. From $118.57 billion in 2017 it increased by 20% to $141.92 billion in 2018.
Source: Amazon Quarterly Results.