Walking away from the deal means Halliburton needs to pay break-fee to its smaller rival of $3.5 billion, but fortunately that will be covered by some of the $7.5 million in notes Halliburton placed in November, in order to build up its cash reserve to a record of more than $10 billion. With combined 2015 revenue of $39.3 billion, Halliburton and Baker Hughes control a nearly 16% market share in the oilfield services field, according to data provider IBISWorld.