Shares of Chevron and Boeing are retreating Wednesday afternoon, sending the Dow Jones Industrial Average into a slump. The Dow /zigman2/quotes/210598065/realtime DJIA -0.07% was most recently trading 1,848 points (8.7%) lower, as shares of Chevron /zigman2/quotes/205871374/composite CVX +0.91% and Boeing /zigman2/quotes/208579720/composite BA -2.65% are contributing to the index's intraday decline. Chevron's shares have declined $15.43 (21.8%) while those of Boeing are off $24.34 (19.6%), combining for a roughly 270-point drag on the Dow. Also contributing significantly to the decline are Travelers /zigman2/quotes/206313935/composite TRV -0.57% , American Express /zigman2/quotes/203805826/composite AXP -3.05% , and United Technologies . A $1 move in any one of the 30 components of the benchmark results in a 6.78-point swing.