Oscar-winning documentary filmmaker Michael Moore’s extensive wealth revealed

Oscar-winning director Michael Moore, famous for documentaries challenging capitalism, has divorced his wife of 22 years following a civil court proceeding in Michigan that drew attention to his wealth.

"'Kathleen and Michael have mutually and amicably reached a divorce settlement'," read a posting this week on Moore's Facebook page, confirming his split from Kathleen Glynn, 56.

Moore - whose films include "Fahrenheit 9/11," "Bowling for Columbine" and "Capitalism: A Love Story" and whose net worth has been estimated at $AUD53 million - filed for divorce a year ago.

In court documents, he alleged that Glynn - credited as a producer on several of his films - had problems managing money in recent years.

He notably blamed her for a costly expansion of their luxury lakeside home in northern Michigan, valued at $AUD2.1 million, the Detroit News newspaper reported.

Moore has previously acknowledged how rich he's become as the most famous documentary filmmaker of his time, insisting that he makes a point of paying his taxes in full.

He is currently busy finalizing the 10th edition of his Traverse City film festival in Michigan, opening Tuesday.