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Coworker Retirement and Other Compensation Benefits	12 Months Ended
Coworker Retirement and Other Compensation Benefits	Dec. 31, 2017
Compensation Related Costs [Abstract]
Coworker Retirement and Other Compensation Benefits	Coworker Retirement and Other Compensation Benefits Profit Sharing Plan and Other Savings Plans The Company has a profit sharing plan that includes a salary reduction feature established under the Internal Revenue Code Section 401(k) covering substantially all coworkers in the US. In addition, coworkers outside the US participate in other savings plans. Company contributions to the profit sharing and other savings plans are made in cash and determined at the discretion of the Board of Directors. For the years ended December 31, 2017, 2016 and 2015, the amounts expensed for these plans were $20 million, $23 million and $20 million, respectively. Coworker Stock Purchase Plan The Company has a Coworker Stock Purchase Plan (the “CSPP”) that provides the opportunity for eligible coworkers to acquire shares of the Company’s common stock at a 5% discount from the closing market price on the final day of the offering period. There is no compensation expense associated with the CSPP. Restricted Debt Unit Plan On March 10, 2010, the Company established the Restricted Debt Unit Plan (the “RDU Plan”), an unfunded nonqualified deferred compensation plan. Compensation expense related to the RDU Plan was $2 million, $2 million and $5 million for the years ended December 31, 2017, 2016 and 2015, respectively. On September 15, 2017, the Company settled the RDU Plan. The total payment made on September 15, 2017 was $31 million, which settled the obligation in full.