The Markit CDX North America Investment Grade Index, a credit-default swaps benchmark that investors use to hedge against losses on corporate debt or to speculate on creditworthiness, decreased 2.2 basis points to a mid-price of 96.1 basis points at 4:50 p.m. in New York, according to data compiled by Bloomberg. Contracts tied to Hewlett-Packard Co. rose to the most since July.