Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of EPS, Amount	Approximately 1 million	Approximately 1 million	Approximately 1 million	Approximately 1 million
Net Income (Loss) Available to Common Stockholders, Operations, Basic [Abstract]
Net income attributable to Hilton stockholders	$ 162	$ 158	$ 540	$ 355
Net Income (Loss) Available to Common Stockholders, Operations, Diluted [Abstract]
Net income attributable to Hilton stockholders	$ 162	$ 158	$ 540	$ 355
Basic EPS:
Weighted average shares outstanding, basic	297	322	305	326
Net income per share	$ 0.55	$ 0.49	$ 1.77	$ 1.09
Diluted EPS:
Weighted average shares outstanding, diluted	300	325	307	328
Net income per share	$ 0.54	$ 0.49	$ 1.76	$ 1.08