Investors love blue-chip stocks that pay fat dividends, but high yield alone doesn’t guarantee a safe income stream.Below are the top large-cap U.S. stocks with the highest yields, followed by why some may be value traps rather than treasure chests.According to Benzinga Pro, the top high-yield large caps are:LyondellBasell Industries LYB: 9.88% yield.United Parcel Service, Inc. UPS: 7.75% yield.Pfizer, Inc. PFE: 6.92% yield.Altria Group, Inc. MO: 6.39% yield.Verizon Communications Inc. VZ: 6.25% yield.Also ...