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Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 31, 2017
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans We have defined contribution retirement plans covering the majority of our employees. We recognized $20 million, $17 million and $14 million in compensation expense for 2017, 2016 and 2015 related to these plans. Contributions to the plans were made in cash.