BP Plc faulted its own engineers for a fatal drilling disaster that triggered the largest U.S. oil spill and said rig owner Transocean Ltd. and contractor Halliburton Co. also share the blame. BP’s internal investigation of the April 20 Deepwater Horizon rig disaster cited at least eight errors of judgment and equipment failures...Halliburton spokeswoman Teresa Wong and Transocean spokesman Guy Cantwell said the companies will comment later.