Shares of American Express and Procter & Gamble are trading lower Tuesday afternoon, sending the Dow Jones Industrial Average into negative territory. Shares of American Express /zigman2/quotes/203805826/composite AXP -2.89% and Procter & Gamble /zigman2/quotes/202894679/composite PG -0.99% have contributed to the blue-chip gauge's intraday decline, as the Dow /zigman2/quotes/210598065/realtime DJIA -0.90% was most recently trading 193 points, or 0.9%, lower. American Express's shares are down $3.81, or 4.2%, while those of Procter & Gamble have declined $4.01, or 3.5%, combining for an approximately 53-point drag on the Dow. Also contributing significantly to the decline are JPMorgan Chase /zigman2/quotes/205971034/composite JPM -2.52% , Home Depot /zigman2/quotes/208081807/composite HD +0.64% , and Intel /zigman2/quotes/203649727/composite INTC +1.17% . A $1 move in any one of the 30 components of the benchmark results in a 6.78-point swing.