Shocking no one who has paid any attention to any of the charts stories published on this site since 2013, Grand Theft Auto V was the best-selling game of the decade in the US by dollar sales.
The NPD Group has provided with a listing of the top-selling games of the decade that saw GTA V comfortably at the top, having been reported as the most profitable entertainment product of all time in 2018 and, at last count in November, having sold 115 million copies worldwide.
In second place? Call of Duty. In third? Also Call of Duty. Call of Duty titles took a total of ten spots in the top 20 games of the decade, with Call of Duty: Black Ops and Call of Duty Black Ops II in second and third place, respectively. As of the franchise's 2015 full-year financials, Call of Duty had surpassed 250 million units across all its entries, and done over $15 billion in total sales life-to-date. Given that all four of its major releases since are also in the top 20, it's likely well beyond that by now.