Amazon defines this as:
Includes commissions, related fulfillment and shipping fees, and other third-party seller services.
2014: $11.747 billion, 2015: $16.086 billion, 2016: $22.993 billion.
Last reported quarter 2022 Q4 it was $36.34 billion, up by 20% year-over-year from $30.32 billion. From $103.37 billion in 2021 it increased by 14% to $117.72 billion in 2022.