At the same time, energy shares added to Friday's gains, suggesting that investors were seeking value.
The S&P energy index .SPNY, which has had the biggest declines among sectors so far this year, ended up 0.7 percent.
The sector had ballooned to its most expensive since early 2008 in terms of price-to-earnings expectations.
The Dow Jones Industrial Average .DJI fell 36.3 points, or 0.17 percent, to 21,235.67, the S&P 500 .SPX lost 2.38 points, or 0.10 percent, to 2,429.39 and the Nasdaq Composite .IXIC dropped 32.45 points, or 0.52 percent, to 6,175.47.
The euro EUR= rose 0.1 percent against the dollar to $1.1205 after pro-European parties scored in French and Italian elections over the weekend.