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Share-Based Compensation	12 Months Ended
Share-Based Compensation	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation	Share-based Compensation Share-based compensation expenses are included in cost of services and products, and selling, general, and administrative expenses in our consolidated statements of operations. For the years ended December 31, 2017, 2016 and 2015, we recorded a share-based compensation expense of approximately $27 million, $22 million and $21 million, respectively. We recognized an income tax benefit from our compensation expense of approximately $7 million, $8 million and $8 million, respectively, during the years ended December 31, 2017, 2016 and 2015, respectively.