Billion-Dollar Break Up

The tycoon's wife who helped build oil giant claims her share of husband's empire.
3:00 | 03/23/13

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Transcript for Billion-Dollar Break Up
donald trump's ex-wife once had a line about divorce that made people smile. I vana trump saying, don't get mad, get everything. A new debate about an oil billionaire tonight. He wasn't a billionaire when he married his wife. So how much does she now get? How much of that fortune did she help build? Steve osunsami on the story TONIGHT. Reporter: As divorces go, this one is humongous. It could split control of america's fastest growing oil company. And could lead to a record-breaking paycheck for the wife who says her husband cheated. This is going to be watched on main street as well as wall street and possibly internationally. Because of the numbers involved. Reporter: Harold hamm is the husband in the dog house. Number 35 on the forbes list of richest americans. Worth $11 billion. A self-made man who started in the business scrubbing out the inside of oil barrels 50 years ago. And there was a lot of oil people around. I had never been arounle like that. You wanted to be like that? I wanted to be like them. Reporter: Sue ann hamm is his wife of 25 years. On the table is his 68% stake in continental resources. The company she helped him build. The wife was a lawyer and economist. That's a bad combination for him. Reporter: Without a prenup, this becomes the biggest war of the roses ever. Nearly twice the $1.7 billion settlement of the murdochs. By comparison, mel and robyn gibson's settlement seems paltry. If sue ann hamm does win, she becomes one of the richest women in america. More wealthy than oprah winfrey. Thank you, steve. When we come back, you'll remember this. ♪

This transcript has been automatically generated and may not be 100% accurate.

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