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Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 31, 2017
Defined Benefit Plan [Abstract]
Employee Benefit Plans	Employee Benefit Plans Defined Benefit Plans In 2018, all of the U.S. and the majority of the international plan assets and obligations were part of the divestiture of the U.S. human resource consulting and actuarial business and the human resource consulting and outsourcing business located in Canada and the U.K. The company's remaining benefit obligations and plan assets in 2018 were $12 million and $3 million, respectively. As of December 31, 2017 the Company had a pension benefit obligation of $280 million ($102 million in the US and $178 million from non-US plans). The plans also had assets of approximately $222 million ($62 million in the US and $160 million from non-US plans), in which the assets were invested primarily in equity and fixed income securities (level 1 and level 2). Defined Contribution Plans We have post-retirement savings and investment plans in several countries, including the U.S., U.K. and Canada. In many instances, employees from those defined benefit pension plans that have been amended to freeze future service accruals were transitioned to an enhanced defined contribution plan. In these plans employees are allowed to contribute a portion of their salaries and bonuses to the plans, and we match a portion of the employee contributions. We recorded charges related to our defined contribution plans of $28 million in 2018, $35 million in 2017 and $35 million in 2016.