Big Apple sales and gains for American Express have put Amex within a few billion dollars of becoming the most valuable holding in Berkshire's portfolio.
Warren Buffett and Becky Quick covered a wide variety of topics in the interviews that aired in a two-hour special on CNBC.
Warren Buffett is considered a guru when it comes to investing and running businesses. But for the 95-year-old, a reputation for kindness may be more important.