If you don't know who Goldman Sachs (or just Goldman) is, they are the undisputed largest & most powerful (investment) bank. I don't think they have retail customers, just corporate. Some in the banking industry say that "governments do not run the world, Goldman does". There are many many Goldman alumni (ex Goldman people) in top finance & political positions.
This article demonstrates the end of dollar dominance. Naturally its not the death of the dollar, but reserve currency status is ending.