Stocks were mostly higher after the opening bell Tuesday as the Federal Reserve prepared to kick off a two-day policy meeting that's expected to result in a half-point rate increase and the beginning of the wind-down of the central bank's balance sheet. The Dow Jones Industrial Average rose 117 points, or 0.4%, while the S&P 500 edged up 0.2%. The Nasdaq Composite weakened in early action, but trimmed losses to trade less than 0.1% lower on the day.