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 2023 Q4 it was $43.56 billion, up by 20% year-over-year from $36.34 billion. From $117.72 billion in 2022 it increased by 19% to $140.05 billion in 2023.