Indices closed in the red zone on Monday. Caterpillar and Apple led Dow decliners while utilities and energy sector brands lagged on the S&P 500. Meanwhile, crude oil prices slipped. West Texas Intermediate crude declined by 0.9 percent to settle at $65.56 a barrel. In M&A action, Dr Pepper Snapple tacked on 29 percent today after K-Cup maker Keurig announced it will buy the soft drink maker. Looking ahead, earnings details are due later this week from technology companies such as Apple, Alphabet, and Amazon.