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WASHINGTON, DC - OCTOBER 13: Warren Buffett speaks onstage during Fortune's Most Powerful Women Summit - Day 2 at the Mandarin Oriental Hotel on October 13, 2015 in Washington, DC. (Photo by Paul Morigi/Getty Images for Fortune/Time Inc)

WASHINGTON, DC - OCTOBER 13:  Warren Buffett speaks onstage during Fortune's Most Powerful Women Summit - Day 2 at the Mandarin Oriental Hotel on October 13, 2015 in Washington, DC.  (Photo by Paul Morigi/Getty Images for Fortune/Time Inc)

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Dara Khosrowshahi, chief executive officer of Expedia Inc., pauses during a Bloomberg Television interview in London, U.K. on Wednesday, Oct. 2, 2013. Expedia Inc. reported second-quarter profit and revenue in August that missed analysts' estimates, leading to a 27 percent plunge in the stock, the steepest in eight years. Photographer: Matthew Lloyd/Bloomberg via Getty Images

Dara Khosrowshahi, chief executive officer of Expedia Inc., pauses during a Bloomberg Television interview in London, U.K. on Wednesday, Oct. 2, 2013. Expedia Inc. reported second-quarter profit and revenue in August that missed analysts' estimates, leading to a 27 percent plunge in the stock, the steepest in eight years. Photographer: Matthew Lloyd/Bloomberg via Getty Images

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DETROIT, MI -Billionaire investor Warren Buffett speaks at an event called, "Detroit Homecoming" September 18, 2014 in Detroit, Michigan. The purpose of the invitation-only event of Detroit expatriats is to give the group a chance to reconnect, reinvest and reinvent with their hometown. The topic of Buffet's conversation was, "Why I'm Bullish on Detroit." (Photo by Bill Pugliano/Getty Images)

DETROIT, MI -Billionaire investor Warren Buffett speaks at an event called, "Detroit Homecoming" September 18, 2014 in Detroit, Michigan. The purpose of the invitation-only event of Detroit expatriats is to give the group a chance to reconnect, reinvest and reinvent with their hometown. The topic of Buffet's conversation was, "Why I'm Bullish on Detroit." (Photo by Bill Pugliano/Getty Images)

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Dara Khosrowshahi, chief executive officer of Expedia Inc., poses for a photograph in London, U.K. on Wednesday, Oct. 2, 2013. Expedia Inc. reported second-quarter profit and revenue in August that missed analysts' estimates, leading to a 27 percent plunge in the stock, the steepest in eight years. Photographer: Matthew Lloyd/Bloomberg via Getty Images

Dara Khosrowshahi, chief executive officer of Expedia Inc., poses for a photograph in London, U.K. on Wednesday, Oct. 2, 2013. Expedia Inc. reported second-quarter profit and revenue in August that missed analysts' estimates, leading to a 27 percent plunge in the stock, the steepest in eight years. Photographer: Matthew Lloyd/Bloomberg via Getty Images

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404925 04: Warren Buffett of Berkshire Hathaway talks to members of the media May 4, 2002 at the annual Berkshire Hathaway shareholders meeting in Omaha, Nebraska. The meeting is an annual pilgrimage for many shareholders and the annual event has been described as "the worshop for capitalists." (Photo by Eric Frances/Getty Images)

404925 04: Warren Buffett of Berkshire Hathaway talks to members of the media May 4, 2002 at the annual Berkshire Hathaway shareholders meeting in Omaha, Nebraska. The meeting is an annual pilgrimage for many shareholders and the annual event has been described as "the worshop for capitalists." (Photo by Eric Frances/Getty Images)