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Savings Plan	12 Months Ended
Savings Plan	Dec. 31, 2017
Savings Plan [Abstract]
Savings Plan	Savings Plan The Company has voluntary 401(k) savings plans designed to enhance the existing retirement programs covering eligible employees. The Company matches a percentage of each employee’s contributions consistent with the provisions of the plan for which he/she is eligible. Total Company matching contributions to the plans were $214 million, $191 million and $187 million in 2017, 2016 and 2015, respectively.