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 $US50 million ($A54 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 lakeside home in northern Michigan, valued at $US2 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 finalising the 10th edition of his Traverse City film festival in Michigan, opening Tuesday.