Basis of Presentation - Effect of Adoption of ASU 2014-09 on Balance Sheets (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and equivalents	$ 701	$ 383
Accounts and notes receivable, net	2,098	1,973
Prepaid expenses and other	232	235
Assets held for sale	121	149
Assets, current, total	3,152	2,740
Property and equipment, net	1,791	1,793
Intangible assets
Goodwill	9,270	9,207
Goodwill and intangible assets, net, total	17,864	17,751
Equity method investments	754	734
Notes receivable, net	147	142
Deferred tax assets	172	93
Other noncurrent assets	604	593
Total assets	24,484	23,846
Current liabilities
Current portion of long-term debt	988	398
Accounts payable	766	783
Accrued payroll and benefits	1,163	1,214
Liability for guest loyalty programs	2,238	2,121
Accrued expenses and other	1,314	1,291
Liabilities, current, total	6,469	5,807
Long-term debt	7,858	7,840
Liability for guest loyalty programs	3,029	2,819
Deferred tax liabilities	634	605
Deferred revenue	645	583
Other noncurrent liabilities	2,283	2,610
Shareholders’ equity
Class A Common Stock	5	5
Additional paid-in-capital	5,685	5,770
Retained earnings	7,898	7,242
Treasury stock, at cost	(10,163)	(9,418)
Accumulated other comprehensive income (loss)	141	(17)
Stockholders' equity (deficit) attributable to parent	3,566	3,582
Liabilities and equity (deficit), total	24,484	23,846
Brands
Intangible assets
Intangible assets	5,972	5,922
Contract acquisition costs and other
Intangible assets
Intangible assets	$ 2,622	2,622
As Previously Reported
Current assets
Cash and equivalents		383
Accounts and notes receivable, net		1,999
Prepaid expenses and other		216
Assets held for sale		149
Assets, current, total		2,747
Property and equipment, net		1,793
Intangible assets
Goodwill		9,207
Goodwill and intangible assets, net, total		18,013
Equity method investments		735
Notes receivable, net		142
Deferred tax assets		93
Other noncurrent assets		426
Total assets		23,949
Current liabilities
Current portion of long-term debt		398
Accounts payable		783
Accrued payroll and benefits		1,214
Liability for guest loyalty programs		2,064
Accrued expenses and other		1,541
Liabilities, current, total		6,000
Long-term debt		7,840
Liability for guest loyalty programs		2,876
Deferred tax liabilities		604
Deferred revenue		145
Other noncurrent liabilities		2,753
Shareholders’ equity
Class A Common Stock		5
Additional paid-in-capital		5,770
Retained earnings		7,391
Treasury stock, at cost		(9,418)
Accumulated other comprehensive income (loss)		(17)
Stockholders' equity (deficit) attributable to parent		3,731
Liabilities and equity (deficit), total		23,949
As Previously Reported | Brands
Intangible assets
Intangible assets		5,922
As Previously Reported | Contract acquisition costs and other
Intangible assets
Intangible assets		2,884
Adoption of ASU 2014-09 | Adjustment
Current assets
Cash and equivalents		0
Accounts and notes receivable, net		(26)
Prepaid expenses and other		19
Assets held for sale		0
Assets, current, total		(7)
Property and equipment, net		0
Intangible assets
Goodwill		0
Goodwill and intangible assets, net, total		(262)
Equity method investments		(1)
Notes receivable, net		0
Deferred tax assets		0
Other noncurrent assets		167
Total assets		(103)
Current liabilities
Current portion of long-term debt		0
Accounts payable		0
Accrued payroll and benefits		0
Liability for guest loyalty programs		57
Accrued expenses and other		(250)
Liabilities, current, total		(193)
Long-term debt		0
Liability for guest loyalty programs		(57)
Deferred tax liabilities		1
Deferred revenue		438
Other noncurrent liabilities		(143)
Shareholders’ equity
Class A Common Stock		0
Additional paid-in-capital		0
Retained earnings		(149)
Treasury stock, at cost		0
Accumulated other comprehensive income (loss)		0
Stockholders' equity (deficit) attributable to parent		(149)
Liabilities and equity (deficit), total		(103)
Adoption of ASU 2014-09 | Adjustment | Brands
Intangible assets
Intangible assets		0
Adoption of ASU 2014-09 | Adjustment | Contract acquisition costs and other
Intangible assets
Intangible assets		$ (262)