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Share-Based Compensation	3 Months Ended
Share-Based Compensation	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Compensation	SHARE-BASED COMPENSATION We recorded share-based compensation expense of $42 million in the 2018 first quarter and $48 million in the 2017 first quarter. Deferred compensation costs for unvested awards totaled $318 million at March 31, 2018 and $168 million at December 31, 2017. RSUs and PSUs We granted 1.3 million RSUs during the 2018 first quarter to certain officers, key employees, and non-employee directors, and those units vest generally over four years in equal annual installments commencing one year after the grant date. We granted 0.1 million PSUs in the 2018 first quarter to certain executive officers, subject to continued employment and the satisfaction of certain performance conditions based on achievement of pre-established targets for Adjusted EBITDA, RevPAR Index, room openings, and/or net administrative expense over, or at the end of, a three-year performance period. RSUs, including PSUs, granted in the 2018 first quarter had a weighted average grant-date fair value of $133.