The personal wealth and holdings of President Trumps chief strategist, Stephen K. Bannon, were detailed for the first time on Friday in a filing that showed a large chunk of his income coming from right-leaning political news, film and consulting companies. The filing was included in a huge release of financial disclosures made late Friday evening by the White House, which is obligated to make public the financial assets and income of scores of officials now serving in the Trump administration. A conservative media impresario and producer of documentary films before joining the Trump campaign, Mr. Bannon has assets worth $11.8 million to $53.8 million, his filing showed. Mr. Bannon disclosed more than $500,000 in income from entities linked to the hedge fund manager Robert Mercer and his daughter, Rebekah Mercer, including $191,000 from the right-leaning media outlet Breitbart News, $125,333 from a data firm called Cambridge Analytica and more than $60,000 from the Government Accountability Institute. The Mercers are major Republican donors who were intimately involved in the shake-up of the Trump campaign last year that led to Mr. Bannons installment as its chief executive.