Name That Company

I'm a holding company worth more than $20 billion. Under my umbrella, you'll find: CNA Financial Corp. (89 percent owned), one of America's largest property casualty insurers, interstate natural gas pipeline specialist Boardwalk Pipeline Partners (70 percent owned), Lorillard (wholly owned, which is America's oldest tobacco company, with brand names including Newport, Kent, True, Maverick and Old Gold), Diamond Offshore Drilling Inc. (51 percent owned), one of the world's largest offshore drilling companies, and a bunch of hotels and resorts that bear my name.

The late billionaire philanthropist Laurence Tisch was my co-founder. Who am I?

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