GE’s shares jumped about 7 percent in premarket trading on Friday after the company said there was potential to return more than $90 billion to investors through 2018. Blackstone Group LP and Wells Fargo & Co are buying most of the assets of GE Capital Real Estate in a deal valued at about $23 billion. GE said it had letters of intent to sell an additional $4 billion of commercial real estate to other buyers that it did not identify.