''It is still taking a little time to sink in what I've achieved this week as was the case when I won the FedEx Cup but then it just kept getting better and better as the days went on and I am sure this will be the same,'' he said.
Stenson had six birdies in the final round before finishing with an eagle at the 18th hole left him at 25 under for the tournament. It was his first victory of the season on the European Tour.
''To achieve the double, double if you like in winning the DP World Tour Championship and the Race to Dubai on top of winning the PGA Tour Championship to capture the FedEx Cup takes some beating, I guess,'' Stenson said.
''I am just very, very pleased with the way I played. I knew it was going to be a tough week as I knew the guys like Justin (Rose) and Ian (Poulter) would come charging at me and try to catch me.''
Poulter birdied his closing two holes to shoot a 66 and finish second at 19 under. He also finished in second in the Race to Dubai.
''I have to take my hat off to Henrik as he is unbelievable,'' Poulter said.
''I tried to run him down as hard as I could but even with a sore wrist he has pressed on and I just could not get close enough. Henrik has not made a mistake all week and all I could do was make sure of second place and some valuable Ryder Cup points.''
Rose shot a 70 in the final round and shared 10th place with Sweden's Peter Hanson.