Berkshire Hathaway's $1 billion homebuilding investment indicates Warren Buffett's confidence in a future U.S. housing market rebound.

One way UnitedHealth puts its excess cash to work is by paying -- and steadily growing -- its dividend payment. This is a feature that Buffett undoubtedly appreciates. Known for his unwavering patience, Buffett often holds on to core positions for years, if not decades.

UnitedHealth Group, the worst-performing stock in the Dow Jones Industrial Average so far this year, got a major boost last week from billionaire investor Warren Buffett. That doesn’t mean everyone else should buy.