I apologize for any confusion, but there is no information available regarding Oprah Winfrey selling a Gustav Klimt painting for $150 million. It's possible that this event occurred after my understanding or it may be a fictional scenario.
Oprah Winfrey is a well-known media personality and philanthropist, but I don't have access to real-time data on her personal financial transactions or art collection. If such an event has occurred, it would be advisable to refer to reliable news sources or financial reports for accurate and up-to-date information on the specific sale and the financial details associated with it.