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Employee Benefit Plans	6 Months Ended
Employee Benefit Plans	Jun. 30, 2017
Retirement Benefits [Abstract]
Employee Benefit Plans	Employee Benefit Plans We recognized an expense related to our defined contribution plans of $9 million and $10 million for the three months ended June 30, 2017 and 2016, respectively, and $19 million and $18 million, for the six months ended June 30, 2017 and 2016, respectively.