Tillerson’s net worth is largely boosted by his stake in Exxon Mobil Corp., his former employer. He has promised to keep clear of conflicts of interest by avoiding decisions about the oil giant for his first year at State.

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Tillerson also plans to sell his more than $50 million in company stock and put any remaining shares he earns as part of his $180 million retirement agreement into an independent trust, he wrote in a letter accompanying the filing.

The former Exxon Mobil CEO has a massive portfolio that includes stocks in companies from around the world. He holds stock in U.S. companies like American Express, Boeing, Caterpillar, Citigroup, Wal-Mart, General Electric, Lockheed Martin and Walt Disney; Japanese companies like Sony, Honda and Toyota; and Chinese companies like Alibaba.

Tillerson wrote to the Office of Government Ethics that upon confirmation, he would divest himself from 156 companies, including all of the ones listed above.

He'll also resign from his positions with the Boy Scots of America, Ford's Theater Society and the Center for Strategic and International Studies. Tillerson disclosed that he already resigned from posts at the Business Roundtable and the American Petroleum Institute.

Tillerson promised not to participate in any decision that involved a company he had a financial tie to because he is "committed to the highest standards of ethical conduct for government officials."

He's expected to face a confirmation hearing as soon as next week, although the official date has not yet been scheduled.