ECONOMIC DATA Reports will include existing-home sales for December on Monday; the Case-Shiller home price index for November and the Conference Board's consumer confidence index for January on Tuesday; new-home sales for December on Wednesday; durable goods orders for December on Thursday; and fourth-quarter gross domestic product and the Reuters/University of Michigan consumer confidence index for January on Friday. CORPORATE EARNINGS Reports will come from Apple and Halliburton on Monday; Delta, DuPont, EMC, Johnson & Johnson, Sun Microsystems, U.S. Steel, Verizon and Yahoo on Tuesday; BlackRock, Boeing, Caterpillar, ConocoPhillips, Qualcomm, UAL and United Technologies on Wednesday; AT&T, Altria, Amazon.com, Bristol-Myers Squibb, CA, Colgate-Palmolive, Eli Lilly, Ford, JetBlue, Lockheed Martin, Microsoft, Procter & Gamble, Raytheon, 3M and US Airways on Thursday; and Chevron, Honeywell and Mattel on Friday. ET CETERA The Federal Reserve begins a two-day meeting on Tuesday, with a statement coming Wednesday. The World Economic Forum takes place in Davos, Switzerland on Wednesday through Sunday. 