HLT Lifestyle International Manage S-4 20 Sep 19 Registration of securities issued in business combination transactions Financial data

Cover Document

Cover Document	6 Months Ended
	Jun. 30, 2019
Entity [Abstract]
Entity Registrant Name	HILTON DOMESTIC OPERATING COMPANY INC.
Entity Central Index Key	0001708510
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Amendment Flag	false
Document Type	S-4
Document Period End Date	Jun. 30, 2019

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 635	$ 403	$ 570
Restricted cash and cash equivalents	83	81	100
Accounts receivable, net of allowance for doubtful accounts	1,190	1,150	1,005
Prepaid expenses	117	160	127
Income taxes receivable		20	36
Other	190	169	169
Assets, Current	2,215	1,983	2,007
Intangibles and Other Assets
Goodwill	5,157	5,160	5,190
Brands	4,874	4,869	4,890
Management and franchise contracts, net	817	872	953
Other intangible assets, net	400	415	433
Operating lease right-of-use asset	891	0
Property, Plant and Equipment, Net	418	367	353
Deferred income tax assets	146	90	111
Other	222	239	291
Total intangibles and other assets	12,925	12,012	12,221
Assets	15,140	13,995	14,228
Current Liabilities:
Accounts payable, accrued expenses and other	1,657	1,530	1,416
Current portion of deferred revenues	298	350	366
Current maturities of long-term debt	37	16	46
Income taxes payable		19	12
Customer Loyalty Program Liability, Current		700	622
Liabilities, Current	2,780	2,615	2,462
Long-term Debt and Capital Lease Obligations	7,772	7,266	6,556
Operating lease liabilities	1,066	0
Deferred revenue	822	826	829
Deferred income tax liabilities	861	898	931
Liability for guest loyalty program		969	839
Other	876	863	920
Liabilities	15,163	13,437	12,537
Commitments and contingencies
Equity:
Preferred stock	0	0	0
Common stock	3	3	3
Treasury stock, at cost	(3,304)	(2,625)	(891)
Additional paid in capital	10,419	10,372	10,298
Accumulated deficit	(6,342)	(6,417)	(6,981)
Accumulated other comprehensive loss	(806)	(782)	(741)
Total Hilton stockholders' equity	(30)	551	1,688
Noncontrolling interests	7	7	3
Total equity (deficit)	(23)	558	1,691
Total liabilities and equity	15,140	13,995	$ 14,228
Guest Loyalty Program [Member]
Current Liabilities:
Current portion of liability for guest loyalty program	788	700
Liability for guest loyalty program	$ 986	969
Restatement
Current assets
Other		189
Current Liabilities:
Accounts payable, accrued expenses and other		$ 1,549

Consolidated Balance Sheets Con

Consolidated Balance Sheets Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 44	$ 42	$ 29
Variable interest entity - current assets	92	90
Variable interest entity - non-current assets	186	178
Variable interest entity - current liabilities	68	56
Variable interest entity - total liabilities	$ 272	$ 263	$ 271
Preferred stock, par value	$ 0.01	$ 0.01	$ 0.01
Preferred stock, authorized shares	3,000,000,000	3,000,000,000	3,000,000,000
Preferred stock, issued shares	0	0	0
Preferred stock, outstanding shares	0	0	0
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Common stock, authorized shares	10,000,000,000	10,000,000,000	10,000,000,000
Common stock, issued shares	333,019,440	332,105,163	331,054,014
Common stock, outstanding shares	287,693,211	294,815,890	317,420,933
Treasury stock, shares	45,326,229	37,289,273	13,633,081
Variable Interest Entity Consolidated Carrying Amount Assets, Current		$ 90	$ 93
Variable Interest Entity Consolidated Carrying Amount Assets, Non-current		178	171
Variable Interest Entity Consolidated Carrying Amount Liabilities, Current		$ 56	$ 58

Consolidated Statement of Opera

Consolidated Statement of Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,484	$ 2,291	$ 4,688	$ 4,365	$ 8,906	$ 8,131	$ 6,576
Depreciation, Depletion and Amortization					325	336	353
Depreciation and amortization	86	79	170	161		336	353
General and Administrative Expense	113	115	220	219	443	439	409
Other Expenses	15	12	35	26	51	56	66
Total expenses excluding reimbursable expenses	548	558	1,057	1,078	2,151	2,100	2,107
Total expenses	2,006	1,885	3,898	3,680	7,474	6,999	5,716
Gain on sale of assets, net					0	0	8
Operating income	478	406	790	685	1,432	1,132	868
Interest expense	(101)	(95)	(199)	(178)	(371)	(351)	(334)
Gain (loss) on foreign currency transactions	(3)	(12)	(3)	(1)	(11)	3	(16)
Loss on debt extinguishment					0	60	0
Other non-operating income, net	(12)	(1)	(8)	13	28	29	22
Income from continuing operations before income taxes	362	298	580	519	1,078	753	540
Income Tax Expense (Benefit)	(101)	(81)	(160)	(139)	(309)	336	(557)
Income (loss) from continuing operations, net of taxes					769	1,089	(17)
Income from discontinued operations, net of taxes					0	0	371
Net income	261	217	420	380	769	1,089	354
Net income attributable to noncontrolling interest	(1)	0	(2)	(2)	(5)	(5)	(16)
Net income attributable to Hilton stockholders	$ 260	$ 217	$ 418	$ 378	$ 764	$ 1,084	$ 338
Earnings per share: basic
Net income (loss) from continuing operations per share					$ 2.53	$ 3.34	$ (0.08)
Net income from discontinued operations per share					0	0	1.11
Earnings Per Share, Basic	$ 0.90	$ 0.72	$ 1.43	$ 1.22	2.53	3.34	1.03
Earnings per share: diluted
Net income (loss) from continuing operations per share					2.50	3.32	(0.08)
Net income from discontinued operations per share					0	0	1.11
Net income per share, diluted	0.89	0.71	1.42	1.21	2.50	3.32	1.03
Cash dividends per share	$ 0.15	$ 0.15	$ 0.30	$ 0.30	$ 0.60	$ 0.60	$ 0.84
Franchise and licensing fees
Revenue from Contract with Customer, Excluding Assessed Tax	$ 444	$ 404	$ 826	$ 735	$ 1,530	$ 1,321	$ 1,091
Base and other management fees
Revenue from Contract with Customer, Excluding Assessed Tax	89	84	169	161	321	324	230
Incentive management fees
Revenue from Contract with Customer, Excluding Assessed Tax	58	59	113	114	235	222	142
Hotel, Owned
Revenue from Contract with Customer, Excluding Assessed Tax	387	392	699	726	1,484	1,432	1,434
Expenses	334	352	632	672	1,332	1,269	1,279
Hotel, Other
Revenue from Contract with Customer, Excluding Assessed Tax	26	22	52	45	98	105	82
Total revenues excluding reimbursable revenues
Revenue from Contract with Customer, Excluding Assessed Tax	1,004	961	1,859	1,781	3,668	3,404	2,979
Other revenues from managed and franchised properties
Revenue from Contract with Customer, Excluding Assessed Tax	1,480	1,330	2,829	2,584	5,238	4,727	3,597
Other expenses from managed and franchised properties
Expenses	$ 1,458	$ 1,327	$ 2,841	$ 2,602	$ 5,323	$ 4,899	$ 3,609

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Millions	3 Months Ended									6 Months Ended		12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 261	$ 225	$ 164	$ 217	$ 163	$ 730	$ 160	$ 151	$ 48	$ 420	$ 380	$ 769	$ 1,089	$ 354
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Currency translation adjustment	15			(77)						12	(45)	(70)	162	(159)
Pension liability adjustment	2			2						4	3	(9)	22	(57)
Cash flow hedge adjustment	(25)			13						(40)	41	22	13	(2)
Total other comprehensive income (loss)	(8)			(62)						(24)	(1)	(57)	197	(218)
Comprehensive income	253			155						396	379	712	1,286	136
Comprehensive income attributable to noncontrolling interest	(1)			0						(2)	(2)	5	5	15
Comprehensive income attributable to Hilton stockholders	$ 252			$ 155						$ 394	$ 377	$ 707	$ 1,281	$ 121

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Currency translation adjustment, tax benefit (expense)	$ 9	$ 0	$ 1	$ 1	$ 6	$ 32	$ 19
Pension liability adjustment, tax benefit (expense)	0	(1)	(1)	(1)	3	(8)	(2)
Cash flow hedge adjustment, tax benefit (expense)	$ 8	$ (4)	$ 13	$ (14)	$ (8)	$ (7)	$ 2

Consolidated Statement of Cash

Consolidated Statement of Cash Flows - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Activities:
Net income	$ 420	$ 380	$ 769	$ 1,089	$ 354
Amortization of contract acquisition costs	14	14
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Amortization of Acquisition Costs	14	14	27	17	16
Depreciation and amortization from continuing and discontinued operations			325	336	673
Depreciation and amortization	170	161		336	353
Gain (loss) on sales of assets, net, including discontinued operations			0	0	(9)
Foreign Currency Transaction Gain (Loss), before Tax from Continuing Operations and Discontinued Operations			(11)	3	(13)
Gain (loss) on foreign currency transactions	(3)	(1)	(11)	3	(16)
Loss on debt extinguishment			0	60	0
Share-based compensation	81	68	127	121	91
Amortization of deferred financing costs and other			16	15	32
Distributions from unconsolidated affiliates			4	1	22
Deferred Income Tax Expense (Benefit) from Continuing and Discontinued Operations			(14)	(729)	(85)
Deferred income taxes	1	(39)	(14)	(729)	(97)
Contract acquisition costs	(43)	(38)	(103)	(75)	(55)
Accounts receivable, net			(161)	(204)	(156)
Prepaid expenses			(39)	(11)	(20)
Increase taxes receivable			17	(24)	84
Other current assets			(4)	0	(2)
Accounts payable, accrued expenses and other			139	25	248
Income taxes payable			9	(42)	28
Change in timeshare financing receivables			0	0	(54)
Change in deferred revenue			(18)	334	534
Change in liability for guest loyalty program			207	29	154
Change in other liabilities			(53)	(95)	(247)
Other	4	(15)	(4)	5	(311)
Net cash used in operating activities	650	532	1,255	849	1,310
Investing Activities:
Capital expenditures for property and equipment	(46)	(28)	(72)	(58)	(317)
Payments received on other financing receivables			50	7	3
Capitalized software costs	(44)	(38)	(87)	(75)	(81)
Other	(5)	(9)	(22)	(21)	(28)
Net cash used in investing activities	(95)	(75)	(131)	(147)	(423)
Financing Activities:
Borrowings	1,795	1,650	1,676	1,824	4,715
Repayment of debt	(1,317)	(672)	(1,005)	(1,860)	(4,359)
Payments of debt issuance costs and redemption premium			21	69	76
Debt issuance costs	(27)	(21)
Dividends paid	(87)	(92)	(181)	(195)	(277)
Cash transferred in spin-offs of Park and HGV			0	(501)	0
Repurchase of common stock	(653)	(1,439)	(1,721)	(891)	0
Distributions to noncontrolling interests			(1)	(1)	(32)
Tax withholding for share-based compensation	(34)	(42)	(44)	(31)	(15)
Acquisition of noncontrolling interest			(3)	0	0
Net cash Provided used in financing activities	(323)	(616)	(1,300)	(1,724)	(44)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations	2	(6)	(10)	8	(15)
Effect of exchange rate changes on cash, restricted cash and cash equivalents	2	(6)
Net increase (decrease) in cash, restricted cash and cash equivalents	234	(165)	(186)	(1,014)	828
Cash, restricted cash and cash equivalents from continuing operations, beginning of period	484	670	670	1,183	633
Cash, restricted cash and cash equivalents from discontinued operations, beginning of period	0	0	0	501	223
Cash, restricted cash and cash equivalents, beginning of period	484	670	670	1,684	856
Cash, restricted cash and cash equivalents from continuing operations, end of period	718	505	484	670	1,183
Cash, restricted cash and cash equivalents from discontinued operations, end of period			0	0	501
Cash, restricted cash and cash equivalents, end of period			484	670	1,684
Interest	190	149
Income Taxes Paid, Net	$ 157	$ 149	$ 288	$ 526	$ 677

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity Statement - USD ($) $ in Millions	Total	Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]	Common stock	Treasury stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss	Noncontrolling interest
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax		$ (3)
Beginning balance, shares at Dec. 31, 2015			329,000,000
Beginning balance, equity attributable to Hilton stockholders at Dec. 31, 2015			$ 3	$ 0	$ 10,158	$ (3,392)	$ (784)
Beginning balance, equity attributable to noncontrolling interest at Dec. 31, 2015								$ (34)
Beginning balance, equity at Dec. 31, 2015	$ 5,951
Net income attributable to Hilton stockholders	338					338
Net income attributable to Hilton stockholders | Accounting standards update 2014-09	(10)
Net income attributable to noncontrolling interest	16							16
Net income attributable to noncontrolling interest | Accounting standards update 2014-09	0
Net income	354
Net income | Accounting standards update 2014-09	(10)
Currency translation adjustment	(159)						(158)	(1)
Pension liability adjustment	(57)						(57)
Cash flow hedge adjustment	(2)						(2)
Other comprehensive income (loss), net of tax, attributable to Hilton stockholders		(57)					(217)
Other comprehensive income (loss), net of tax, attributable to noncontrolling interest								(1)
Other comprehensive income (loss), net of tax, attributable to noncontrolling interest	218
Dividends	(279)					(279)
Share-based compensation	62				62
Distributions	(32)							(32)
Acquisition of noncontrolling interest	0
Deconsolidation of a variable interest entity	(4)							(4)
Ending balance, shares at Dec. 31, 2016			329,000,000
Ending balance, equity attributable to Hilton stockholders at Dec. 31, 2016			$ 3	0	10,220	(3,545)	(1,001)
Ending balance, equity attributable to noncontrolling interest at Dec. 31, 2016								(50)
Ending balance, equity at Dec. 31, 2016	5,627
Cumulative effect of the adoption of ASU | Accounting standards update 2014-09	(212)					(212)
Cumulative effect of the adoption of ASU | Accounting standards update 2015-02	5							5
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax		(3)
Net income attributable to Hilton stockholders	1,084					1,084
Net income attributable to Hilton stockholders | Accounting standards update 2014-09	(175)
Net income attributable to noncontrolling interest	5							5
Net income attributable to noncontrolling interest | Accounting standards update 2014-09	0
Net income	1,089
Net income | Accounting standards update 2014-09	(175)
Currency translation adjustment	162						162
Pension liability adjustment	22						22
Cash flow hedge adjustment	13						13
Other comprehensive income (loss), net of tax, attributable to Hilton stockholders		22					197
Other comprehensive income (loss), net of tax, attributable to noncontrolling interest								0
Other comprehensive income (loss), net of tax, attributable to noncontrolling interest	(197)
Dividends	(196)					(196)
Repurchases of common stock, shares			(14,000,000)
Repurchases of common stock	(891)			(891)
Share-based compensation, shares			2,000,000
Share-based compensation	77				77
Distributions	(1)							(1)
Spin-offs of Park and HGV	(4,211)	0				(4,323)	63	49
Acquisition of noncontrolling interest	$ 0
Ending balance, shares at Dec. 31, 2017	317,420,933		317,000,000
Ending balance, equity attributable to Hilton stockholders at Dec. 31, 2017	$ 1,688		$ 3	(891)	10,298	(6,981)	(741)
Ending balance, equity attributable to noncontrolling interest at Dec. 31, 2017	(3)							3
Ending balance, equity at Dec. 31, 2017	1,691
Ending balance, equity (Accounting standards update 2014-09) at Dec. 31, 2017	(384)
Cumulative effect of the adoption of ASU | Accounting standards update 2016-09	0				1	(1)
Net income attributable to Hilton stockholders	161
Net income	163
Ending balance, shares at Mar. 31, 2018			317,000,000
Ending balance, equity attributable to Hilton stockholders at Mar. 31, 2018			$ 3	(1,001)	10,288	(6,868)	(680)
Ending balance, equity attributable to noncontrolling interest at Mar. 31, 2018								5
Ending balance, equity at Mar. 31, 2018	$ 1,747
Beginning balance, shares at Dec. 31, 2017	317,420,933		317,000,000
Beginning balance, equity attributable to Hilton stockholders at Dec. 31, 2017	$ 1,688		$ 3	(891)	10,298	(6,981)	(741)
Beginning balance, equity attributable to noncontrolling interest at Dec. 31, 2017	(3)							3
Beginning balance, equity at Dec. 31, 2017	1,691
Beginning balance, equity (Accounting standards update 2014-09) at Dec. 31, 2017	(384)
Net income attributable to Hilton stockholders	378					378
Net income attributable to noncontrolling interest	2							2
Net income	380
Currency translation adjustment	(45)
Pension liability adjustment	3
Cash flow hedge adjustment	41
Other comprehensive income (loss), net of tax, attributable to Hilton stockholders		3					(1)
Other comprehensive income (loss), net of tax, attributable to noncontrolling interest	1
Dividends	(94)					(94)
Repurchases of common stock, shares			(20,000,000)
Repurchases of common stock	(1,439)			(1,439)
Share-based compensation, shares			1,000,000
Ending balance, shares at Jun. 30, 2018			298,000,000
Ending balance, equity attributable to Hilton stockholders at Jun. 30, 2018			$ 3	(2,330)	10,321	(6,697)	(742)
Ending balance, equity attributable to noncontrolling interest at Jun. 30, 2018								5
Ending balance, equity at Jun. 30, 2018	$ 560
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax		(2)
Beginning balance, shares at Dec. 31, 2017	317,420,933		317,000,000
Beginning balance, equity attributable to Hilton stockholders at Dec. 31, 2017	$ 1,688		$ 3	(891)	10,298	(6,981)	(741)
Beginning balance, equity attributable to noncontrolling interest at Dec. 31, 2017	(3)							3
Beginning balance, equity at Dec. 31, 2017	1,691
Beginning balance, equity (Accounting standards update 2014-09) at Dec. 31, 2017	(384)
Net income attributable to Hilton stockholders	764					764
Net income attributable to noncontrolling interest	5							5
Net income	769
Currency translation adjustment	(70)						(70)
Pension liability adjustment	(9)						(9)
Cash flow hedge adjustment	22						22
Other comprehensive income (loss), net of tax, attributable to Hilton stockholders		(9)					(57)
Other comprehensive income (loss), net of tax, attributable to noncontrolling interest								0
Other comprehensive income (loss), net of tax, attributable to noncontrolling interest	57
Dividends	(184)					(184)
Repurchases of common stock, shares			(23,000,000)
Repurchases of common stock	(1,721)			(1,721)
Share-based compensation, shares			1,000,000
Share-based compensation	64			(13)	77
Distributions	(1)							(1)
Acquisition of noncontrolling interest	$ (3)				(3)
Ending balance, shares at Dec. 31, 2018	294,815,890		295,000,000
Ending balance, equity attributable to Hilton stockholders at Dec. 31, 2018	$ 551		$ 3	(2,625)	10,372	(6,417)	(782)
Ending balance, equity attributable to noncontrolling interest at Dec. 31, 2018	(7)							7
Ending balance, equity at Dec. 31, 2018	558
Beginning balance, shares at Mar. 31, 2018			317,000,000
Beginning balance, equity attributable to Hilton stockholders at Mar. 31, 2018			$ 3	(1,001)	10,288	(6,868)	(680)
Beginning balance, equity attributable to noncontrolling interest at Mar. 31, 2018								5
Beginning balance, equity at Mar. 31, 2018	1,747
Net income attributable to Hilton stockholders	217					217
Net income attributable to noncontrolling interest	0
Net income	217
Currency translation adjustment	(77)
Pension liability adjustment	2
Cash flow hedge adjustment	13
Other comprehensive income (loss), net of tax, attributable to Hilton stockholders							(62)
Other comprehensive income (loss), net of tax, attributable to noncontrolling interest	62
Dividends	(46)					(46)
Repurchases of common stock, shares			(19,000,000)
Repurchases of common stock	(1,329)			(1,329)
Ending balance, shares at Jun. 30, 2018			298,000,000
Ending balance, equity attributable to Hilton stockholders at Jun. 30, 2018			$ 3	(2,330)	10,321	(6,697)	(742)
Ending balance, equity attributable to noncontrolling interest at Jun. 30, 2018								5
Ending balance, equity at Jun. 30, 2018	560
Cumulative effect of the adoption of ASU | Accounting standards update 2018-02	$ 0	22				(16)	(16)
Beginning balance, shares at Dec. 31, 2018	294,815,890		295,000,000
Beginning balance, equity attributable to Hilton stockholders at Dec. 31, 2018	$ 551		$ 3	(2,625)	10,372	(6,417)	(782)
Beginning balance, equity attributable to noncontrolling interest at Dec. 31, 2018	(7)							7
Beginning balance, equity at Dec. 31, 2018	558
Net income attributable to Hilton stockholders	418					418
Net income attributable to noncontrolling interest	2							2
Net income	420
Currency translation adjustment	12
Pension liability adjustment	4
Cash flow hedge adjustment	(40)
Other comprehensive income (loss), net of tax, attributable to Hilton stockholders		$ 4					(24)
Other comprehensive income (loss), net of tax, attributable to noncontrolling interest	24
Dividends	(87)					(87)
Repurchases of common stock, shares			(8,000,000)
Repurchases of common stock	$ (679)			(679)
Share-based compensation, shares			1,000,000
Ending balance, shares at Jun. 30, 2019	287,693,211		288,000,000
Ending balance, equity attributable to Hilton stockholders at Jun. 30, 2019	$ (30)		$ 3	(3,304)	10,419	(6,342)	(806)
Ending balance, equity attributable to noncontrolling interest at Jun. 30, 2019	(7)							7
Ending balance, equity at Jun. 30, 2019	(23)
Beginning balance, shares at Mar. 31, 2019			292,000,000
Beginning balance, equity attributable to Hilton stockholders at Mar. 31, 2019			$ 3	(2,921)	10,374	(6,558)	(798)
Beginning balance, equity attributable to noncontrolling interest at Mar. 31, 2019								8
Beginning balance, equity at Mar. 31, 2019	108
Net income attributable to Hilton stockholders	260					260
Net income attributable to noncontrolling interest	1							1
Net income	261
Currency translation adjustment	15
Pension liability adjustment	2
Cash flow hedge adjustment	(25)
Other comprehensive income (loss), net of tax, attributable to Hilton stockholders							(8)
Other comprehensive income (loss), net of tax, attributable to noncontrolling interest	8
Dividends	(44)					(44)
Repurchases of common stock, shares			(4,000,000)
Repurchases of common stock	$ (383)			(383)
Ending balance, shares at Jun. 30, 2019	287,693,211		288,000,000
Ending balance, equity attributable to Hilton stockholders at Jun. 30, 2019	$ (30)		$ 3	$ (3,304)	$ 10,419	$ (6,342)	$ (806)
Ending balance, equity attributable to noncontrolling interest at Jun. 30, 2019	(7)							$ 7
Ending balance, equity at Jun. 30, 2019	$ (23)

Organization

Organization	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization Hilton Worldwide Holdings Inc. (the "Parent," or together with its subsidiaries, "Hilton," "we," "us," "our" or the "Company"), a Delaware corporation, is one of the largest hospitality companies in the world and is engaged in managing, franchising, owning and leasing hotels and resorts and licensing its brands and intellectual property ("IP"). As of June 30, 2019 , we managed, franchised, owned or leased 5,872 hotels and resorts, including timeshare properties, totaling 939,297 rooms in 114 countries and territories.	Organization Organization Hilton Worldwide Holdings Inc. (the "Parent," or together with its subsidiaries, "Hilton," "we," "us," "our" or the "Company"), a Delaware corporation, is one of the largest hospitality companies in the world and is engaged in managing, franchising, owning and leasing hotels and resorts, including timeshare properties. As of December 31, 2018 , we managed, franchised, owned or leased 5,685 hotels and resorts, totaling 912,960 rooms in 113 countries and territories. In March 2017, HNA Tourism Group Co., Ltd and certain affiliates ("HNA") acquired 82.5 million shares of Hilton common stock from affiliates of The Blackstone Group L.P. ("Blackstone"), resulting in a 25 percent equity interest of our common stock. In April and May 2018, HNA and Blackstone, respectively, fully divested of their investments in Hilton. Spin-offs On January 3, 2017, we completed the spin-offs of a portfolio of hotels and resorts, as well as our timeshare business, into two independent, publicly traded companies: Park Hotels & Resorts Inc. ("Park") and Hilton Grand Vacations Inc. ("HGV"), respectively, (the "spin-offs"). See Note 3: "Discontinued Operations" for additional information.

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies [Text Block]	Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation The accompanying condensed consolidated financial statements for the three and six months ended June 30, 2019 and 2018 have been prepared in accordance with United States ("U.S.") generally accepted accounting principles ("GAAP") and are unaudited. We have condensed or omitted certain information and footnote disclosures normally included in financial statements presented in accordance with GAAP. Although we believe the disclosures made are adequate to prevent the information presented from being misleading, these financial statements should be read in conjunction with the consolidated financial statements and notes thereto in our consolidated financial statements for the fiscal year ended December 31, 2018 included elsewhere in this prospectus. Certain prior year amounts in our condensed consolidated balance sheets have been reclassified to conform to current year presentation. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported and, accordingly, ultimate results could differ from those estimates. Additionally, interim results are not necessarily indicative of full year performance. In our opinion, the accompanying condensed consolidated financial statements reflect all adjustments, including normal recurring items, considered necessary for a fair presentation of the interim periods. All material intercompany transactions have been eliminated in consolidation. Summary of Significant Accounting Policies Our significant accounting policies are detailed in Note 2: "Basis of Presentation and Summary of Significant Accounting Policies" in our consolidated financial statements for the fiscal year ended December 31, 2018 included elsewhere in this prospectus. On January 1, 2019, we adopted the requirements of Accounting Standards Update ("ASU") No. 2016-02 ("ASU 2016-02"), Leases (Topic 842), and the significant accounting policies that changed as a result of the adoption are set forth below. Leases We determine if a contract is or contains a lease at the inception of the contract, and we classify that lease as a finance lease if it meets certain criteria or as an operating lease when it does not. We reassess if a contract is or contains a leasing arrangement upon modification of the contract. For a contract, in which we are a lessee, that contains fixed payments for both lease and non-lease components, we have elected to account for the components as a single lease component, as permitted. At the commencement date of a lease, we recognize a lease liability for future fixed lease payments and a right-of-use ("ROU") asset representing our right to use the underlying asset during the lease term. The lease liability is initially measured as the present value of the future fixed lease payments that will be made over the lease term. The lease term includes lessee options to extend the lease and periods occurring after a lessee early termination option, only to the extent it is reasonably certain that we will exercise such extension options and not exercise such early termination options, respectively. The future fixed lease payments are discounted using the rate implicit in the lease, if available, or our incremental borrowing rate. Our incremental borrowing rate is estimated on a portfolio basis and incorporates lease term, currency risk, credit risk and an adjustment for collateral. Upon adoption of ASU 2016-02, we elected to use the remaining lease term as of January 1, 2019 in our estimation of the applicable discount rate for leases that were in place at adoption. For the initial measurement of the lease liability for leases commencing after January 1, 2019, we use the discount rate as of the commencement date of the lease, incorporating the entire lease term. Additionally, we elected not to recognize leases with lease terms of 12 months or less at the commencement date in our consolidated balance sheets. Current maturities and long-term portions of operating lease liabilities are classified as accounts payable, accrued expenses and other and operating lease liabilities, respectively, and current maturities and long-term portions of finance lease liabilities are classified as current maturities of long-term debt and long-term debt, respectively, in our consolidated balance sheets. The ROU asset is measured at the amount of the lease liability with adjustments, if applicable, for lease prepayments made prior to or at lease commencement, initial direct costs incurred by us and lease incentives. We evaluate the carrying value of ROU assets if there are indicators of impairment and review the recoverability of the related asset group. If the carrying value of the asset group is determined to not be recoverable and is in excess of the estimated fair value, we record an impairment loss in our consolidated statements of operations. ROU assets of operating leases are classified as operating lease right-of-use assets and ROU assets of finance leases are classified as property and equipment, net in our consolidated balance sheets. Our operating leases require: (i) fixed lease payments, or minimum payments, as contractually stated in the lease agreement; (ii) variable lease payments, which, for our hotels, are generally based on a percentage of the underlying asset's revenues or profits, or are dependent on changes in an index; or (iii) lease payments equal to the greater of the fixed or variable lease payments. In addition, we may be required to pay some, or all, of the capital costs for furniture, equipment and leasehold improvements in a hotel property that we lease during the term of the lease. For operating leases, lease expense relating to fixed payments is recognized on a straight-line basis over the lease term, and lease expense relating to variable payments is expensed as incurred, with amounts recognized in owned and leased hotel expenses, general and administrative expenses and other expenses from managed and franchised properties in our consolidated statements of operations. For finance leases, the amortization of the asset is recognized over the shorter of the lease term or useful life of the underlying asset within depreciation and amortization expense and other expenses from managed and franchised properties in our consolidated statements of operations. The interest expense related to finance leases, including any variable lease payments, is recognized in interest expense in our consolidated statements of operations. Recently Issued Accounting Pronouncements In August 2018, the Financial Accounting Standards Board ("FASB") issued ASU No. 2018-15 ("ASU 2018-15"), Intangibles – Goodwill and Other – Internal-use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. This ASU aligns guidance for capitalizing implementation costs incurred in a cloud computing arrangement that is a service contract with guidance for capitalizing implementation costs to develop or obtain internal-use software. Capitalized implementation costs will be amortized over the term of the arrangement and presented in the same line item in the statement of operations as the fees associated with the service contract. We elected, as permitted by the standard, to early adopt ASU 2018-05 on a prospective basis as of January 1, 2019. The adoption did not have a material effect on our condensed consolidated financial statements. In February 2016, the FASB issued ASU 2016-02 , which supersedes existing guidance on accounting for leases in Leases (Topic 840) and generally requires all leases, including operating leases, to be recognized in the statement of financial position of lessees as ROU assets and lease liabilities, with certain practical expedients available. Subsequent to ASU 2016-02, the FASB issued related ASUs, including ASU No. 2018-11 ("ASU 2018-11"), Leases (Topic 842): Targeted Improvements, which provides for another transition method in addition to the modified retrospective approach required by ASU 2016-02. This option allows entities to initially apply the new leases standard at the adoption date and recognize a cumulative adjustment to the opening balance of retained earnings in the period of adoption. As described above, we adopted ASU 2016-02 on January 1, 2019 and applied the package of practical expedients included therein, as well as utilized the transition method included in ASU 2018-11. By applying ASU 2016-02 at the adoption date, as opposed to at the beginning of the earliest period presented, the presentation of financial information for periods prior to January 1, 2019 remain unchanged and in accordance with Leases (Topic 840) . On January 1, 2019, we recognized a $256 million cumulative adjustment to accumulated deficit, net of taxes of $81 million related to a decrease to our deferred tax liability, as a result of the impairment of ROU assets that occurred in periods prior to the adoption date.	Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation These consolidated financial statements present the consolidated financial position and results of operations of Hilton as of and for the years ended December 31, 2018 , 2017 and 2016 , with the combined historical financial results of Park and HGV for the year ended December 31, 2016 reflected as discontinued operations. Unless otherwise indicated, the information in the notes to the consolidated financial statements refer only to Hilton's continuing operations and do not include discussion of balances or activity of Park or HGV. Principles of Consolidation Our consolidated financial statements include the accounts of our wholly owned subsidiaries and entities in which we have a controlling financial interest, including variable interest entities ("VIEs") for which we are the primary beneficiary. Entities in which we have a controlling financial interest generally comprise majority owned real estate ownership and management enterprises. The determination of a controlling financial interest is based upon the terms of the governing agreements of the respective entities, including the evaluation of rights held by other ownership interests. If the entity is considered to be a VIE, we determine whether we are the primary beneficiary, and then consolidate those VIEs for which we have determined we are the primary beneficiary. If the entity in which we hold an interest does not meet the definition of a VIE, we evaluate whether we have a controlling financial interest through our voting interests in the entity. We consolidate entities when we own more than 50 percent of the voting shares of a company or otherwise have a controlling financial interest. All material intercompany transactions and balances have been eliminated in consolidation. References in these financial statements to net income (loss) attributable to Hilton stockholders and Hilton stockholders' equity (deficit) do not include noncontrolling interests, which represent the outside ownership interests of our consolidated, non-wholly owned entities and are reported separately. Use of Estimates The preparation of financial statements in conformity with United States ("U.S") generally accepted accounting principles ("GAAP") requires management to make estimates and assumptions that affect the amounts reported and, accordingly, ultimate results could differ from those estimates. Reclassifications On January 1, 2018, we adopted the requirements of Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09") using the full retrospective approach as of January 1, 2016. All amounts and disclosures set forth in this prospectus reflect the necessary adjustments required for the adoption of this standard, including the reclassification of prior period balances to conform to current year presentation. See "Summary of Significant Accounting Policies" below for additional information. Summary of Significant Accounting Policies Revenue Recognition Revenues are primarily derived from management and franchise contracts with third-party hotel and resort owners, as well as from our owned and leased hotels. The majority of our performance obligations are a series of distinct goods or services, for which we receive variable consideration through our management and franchise fees or fixed consideration through our owned and leased hotels. We allocate the variable fees to the distinct services to which they relate applying the prescribed variable consideration allocation guidance, and we allocate fixed consideration to the related performance obligations based on their estimated standalone selling prices. We do not adjust the promised amount of consideration for the effects of a significant financing component when we expect, at contract inception, that the period between our transfer of a promised good or service to a customer and when the customer pays for that good or service will be one year or less, which it is in substantially all cases. Additionally, we do not typically include extended payment terms in our contracts with customers. Management and franchise revenues We identified the following performance obligations in connection with our management and franchise contracts: • Intellectual Property ("IP") licenses grant the right to access our hotel system IP, including brand IP, reservations systems and property management systems. • Hotel management services include providing day-to-day management services of the hotels for the property owners. • Development services include providing consultative services (e.g., design assistance and contractor selection) to the property owner to assist with the construction of the hotel prior to the hotel opening. • Pre-opening services include providing services (e.g., advertising, budgeting, e-commerce strategies, food and beverage testing) to the property owner to assist in preparing for the hotel opening. • Substantive rights for free or discounted goods or services to hotel guests are satisfied at the earlier point in time of either when the substantive right expires or the underlying free or discounted good or service is provided to the hotel guest. Each of the identified performance obligations is considered to be a series of distinct services transferred over time. While the underlying activities may vary from day to day, the nature of the commitments are the same each day, and the property owner can independently benefit from each day's services. Management and franchise fees are typically based on the sales or usage of the underlying hotel, with the exception of fixed upfront fees, which usually represent an insignificant portion of the transaction price. Franchise and licensing fees represent fees earned in connection with the licensing of one of our brands, usually under long-term contracts with the property owner, and include the following: • Royalty fees are generally based on a percentage of the hotel's monthly gross room revenue and, in some cases, may also include a percentage of gross food and beverage revenues and other revenues, as applicable. These fees are typically billed and collected monthly, and revenue is generally recognized as services are provided. • Application, initiation and other fees are charged when: (i) new hotels enter our system; (ii) there is a change of ownership of a hotel; or (iii) contracts with properties already in our system are extended. These fees are typically fixed and collected upfront and are recognized as revenue over the term of the franchise contract. We do not consider this advance consideration to include a significant financing component, since it is used to protect us from the property owner failing to adequately complete some or all of its obligations under the contract. • Licensing fees are earned from: (i) a license agreement with HGV to use certain Hilton marks and IP in its timeshare business, which are typically billed and collected monthly, and revenue is generally recognized at the same time the fees are billed and (ii) co-brand credit card arrangements, which are recognized as revenue when points for our guest loyalty program, Hilton Honors, are issued, generally as spend on the co-branded credit card occurs; see further discussion below under "Hilton Honors." Consideration paid or anticipated to be paid to incentivize hotel owners to enter into franchise contracts with us is amortized over the life of the applicable contract as a reduction to franchise and licensing fees. Management fees represent fees earned from hotels that we manage, usually under long-term contracts with the property owner, and include the following: • Base management fees are generally based on a percentage of the hotel's monthly gross revenue. Base fees are typically billed and collected monthly, and revenue is generally recognized as services are provided. • Incentive management fees are generally based on a percentage of the hotel's operating profits and in some cases may be subject to a stated return threshold to the property owner, normally over a one-calendar year period (the "incentive period"). Incentive fee revenue is recognized on a monthly basis, but only to the extent the cumulative fee earned does not exceed the probable fee for the incentive period. Incentive fee payment terms vary, but they are generally billed and collected monthly or annually upon completion of the incentive period. Consideration paid or anticipated to be paid to incentivize hotel owners to enter into management contracts with us is amortized over the life of the applicable contract as a reduction to base and other management fees. We do not estimate revenues expected to be recognized related to our unsatisfied performance obligations for our: (i) royalty fees, since they are considered sales-based royalty fees recognized as hotel room sales occur in exchange for licenses of our brand names over the terms of the franchise contracts and (ii) base management fees and incentive management fees, since they are allocated entirely to the wholly unsatisfied promise to transfer management services, which form part of a single performance obligation in a series, over the term of the individual management contract. Other revenues from managed and franchised properties represent amounts that are contractually reimbursed to us by property owners, either directly as costs are incurred or indirectly through fees that are billed and collected in advance related to certain costs and expenses of the related properties, and include the following: • Direct reimbursements include payroll and related costs and certain other operating costs of the managed and franchised properties' operations, which are contractually reimbursed to us by the property owners as expenses are incurred. Revenue is recognized based on the amount of expenses incurred by Hilton, which are presented as other expenses from managed and franchised properties in our consolidated statements of operations, that are then reimbursed to us by the property owner typically on a monthly basis, which results in no net effect on operating income (loss) or net income (loss). • Indirect reimbursements include marketing expenses and other expenses associated with our brands and shared services, which are paid from fees collected by Hilton from the managed and franchised properties. Indirect reimbursements are typically billed and collected monthly, based on the underlying hotel's sales or usage (such as gross room revenue and number of reservations processed), and revenue is generally recognized as services are provided. System implementation fees charged to property owners are deferred and recognized as revenue over the term of the management or franchise contract. The corresponding expenses are expensed as incurred and are presented as other expenses from managed and franchised properties in our consolidated statements of operations and are expected to equal the revenues earned from indirect reimbursements over time. The management and franchise fees and reimbursements from third-party hotel owners are allocated to the performance obligations and the distinct services to which they relate using their estimated standalone selling prices. The terms of the fees earned under the contract relate to a specific outcome of providing the services (e.g., hotel room sales) or to Hilton's efforts (e.g., costs) to satisfy the performance obligations. Using time as the measure of progress, we recognize fee revenue and indirect reimbursements in the period earned per the terms of the contract and revenue related to direct reimbursements in the period in which the cost is incurred. Owned and leased hotel revenues We identified the following performance obligations in connection with our owned and leased hotel revenues, for which revenue is recognized as the respective performance obligations are satisfied, which results in recognizing the amount we expect to be entitled to for providing the goods or services: • Cancellable room reservations or ancillary services are typically satisfied as the good or service is transferred to the hotel guest, which is generally when the room stay occurs. • Noncancellable room reservations and banquet or conference reservations represent a series of distinct goods or services provided over time and satisfied as each distinct good or service is provided, which is reflected by the duration of the reservation. • Substantive rights for free or discounted goods or services are satisfied at the earlier of when: (i) the substantive right expires or (ii) the underlying free or discounted good or service is provided to the hotel guest. • Other ancillary goods and services are purchased independently of the room reservation at standalone selling prices and are considered separate performance obligations, which are satisfied when the related good or service is provided to the hotel guest. • Components of package reservations for which each component could be sold separately to other hotel guests are considered separate performance obligations and are satisfied as set forth above. Owned and leased hotel revenues primarily consist of hotel room sales, revenue from accommodations sold in conjunction with other services (e.g., package reservations), food and beverage sales and other ancillary goods and services (e.g., parking) related to owned, leased and consolidated non-wholly owned hotel properties. Revenue is recognized when rooms are occupied or goods and services have been delivered or rendered, respectively. Payment terms typically align with when the goods and services are provided. Owned and leased hotel revenues are reduced upon issuance of Hilton Honors points for Hilton Honors members' paid stay transactions and are recognized when Hilton Honors points are redeemed for a free stay at an owned or leased hotel (see the "Hilton Honors" section below for additional information). Although the transaction prices of hotel room sales, goods and other services are generally fixed and based on the respective room reservation or other agreement, an estimate to reduce the transaction price is required if a discount is expected to be provided to the customer. For package reservations, the transaction price is allocated to the performance obligations within the package based on the estimated standalone selling prices of each component. On occasion, the hotel may also provide the customer with a substantive right to a free or discounted good or service in conjunction with a room reservation or banquet contract (e.g., free breakfast and free room night for every four nights booked). These substantive rights are considered separate performance obligations to which a portion of the transaction price is allocated based on the estimated standalone selling prices of the good or service, adjusted for the likelihood the hotel guest will exercise the right. Other revenues Other revenues include revenues generated by the incidental support of hotel operations for owned, leased, managed and franchised hotels, including purchasing operations, and other operating income. Purchasing revenues include any amounts received for vendor rebate arrangements that we participate in as a manager of hotels. Taxes and fees collected on behalf of governmental agencies We are required to collect certain taxes and fees from customers on behalf of governmental agencies and remit these back to the applicable governmental agencies on a periodic basis. We have a legal obligation to act as a collection agent. We do not retain these taxes and fees and, therefore, they are not included in our measurement of transaction prices. We have elected to present revenue net of sales taxes and other similar taxes. We record a liability when the amounts are collected and relieve the liability when payments are made to the applicable taxing authority or other appropriate governmental agency. Discontinued Operations In determining whether a group of assets that is disposed (or to be disposed) should be presented as a discontinued operation, we analyze whether the group of assets being disposed represents a component of the Company; that is, whether it had historic operations and cash flows that were clearly distinguished, both operationally and for financial reporting purposes. In addition, we consider whether the disposal represents a strategic shift that has or will have a major effect on our operations and financial results. The historical results and financial position of discontinued operations are separately presented in our consolidated financial statements. Cash and Cash Equivalents Cash and cash equivalents include all highly liquid investments with original maturities, when purchased, of three months or less. Restricted Cash and Cash Equivalents Restricted cash and cash equivalents include cash balances established as security for certain guarantees, ground rent and property tax escrows, insurance, including self-insurance collateral, and furniture, fixtures and equipment replacement reserves required under certain lease agreements. Allowance for Doubtful Accounts An allowance for doubtful accounts is provided on accounts receivable when losses are probable based on historical collection activity and current business conditions. Contract Assets Contract assets relate to incentive management fees for which the period of service has passed, but for which our right to consideration is conditional upon completing the requirements of the incentive fee period. Contract assets are included in other current assets in our consolidated balance sheets and are reclassified to accounts receivable when our right to consideration becomes unconditional. Goodwill Goodwill represents the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. We do not amortize goodwill, but rather evaluate goodwill for potential impairment on an annual basis or at other times during the year if events or circumstances indicate that it is more likely than not that the fair value of a reporting unit is below the carrying amount. In connection with the October 24, 2007 transaction whereby we became a wholly owned subsidiary of affiliates of Blackstone (the "Merger"), we recorded goodwill representing the excess purchase price over the fair value of the other identified assets and liabilities. We evaluate goodwill for potential impairment by comparing the carrying values of our reporting units to their fair values. Our reporting units are the same as our operating segments as described in Note 19: "Business Segments." In any year we may elect to perform a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is in excess of its carrying value. If we cannot determine qualitatively that the fair value is in excess of the carrying value, or if we decide to bypass the qualitative assessment, we perform a quantitative analysis. The quantitative analysis is used to identify both the existence of impairment and the amount of the impairment loss by comparing the estimated fair value of a reporting unit to its carrying value, including goodwill. The estimated fair value is based on internal projections of expected future cash flows and operating plans, as well as market conditions relative to the operations of our reporting units. If the estimated fair value of the reporting unit exceeds its carrying value, goodwill of the reporting unit is not impaired; otherwise, an impairment loss would be recognized in our consolidated statements of operations in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit. Brands We manage, franchise, own and lease hotels under our portfolio of brands. There are no legal, regulatory, contractual, competitive, economic or other factors that limit the useful lives of these brands and, accordingly, the useful lives of these brands are considered to be indefinite. As of December 31, 2018 , our brand portfolio included Waldorf Astoria Hotels & Resorts, LXR Hotels & Resorts, Conrad Hotels & Resorts, Canopy by Hilton, Hilton Hotels & Resorts, Curio Collection by Hilton, DoubleTree by Hilton, Tapestry Collection by Hilton, Embassy Suites by Hilton, Motto by Hilton, Hilton Garden Inn, Hampton by Hilton, Tru by Hilton, Homewood Suites by Hilton, Home2 Suites by Hilton and our timeshare brand, Hilton Grand Vacations. At the time of the Merger, our brands were assigned a fair value based on a common valuation technique known as the relief from royalty approach. LXR Hotels & Resorts, Canopy by Hilton, Curio Collection by Hilton, Tapestry Collection by Hilton, Motto by Hilton, Tru by Hilton, and Home2 Suites by Hilton were launched post-Merger and, as such, they were not assigned fair values, and we do not have any intangible assets for these brands recorded in our consolidated balances sheets. We evaluate our brands intangible assets for impairment on an annual basis or at other times during the year if indicators of impairment exist. In any year we may elect to perform a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is in excess of its carrying value. If we cannot determine qualitatively that the fair value is in excess of the carrying value, or if we decide to bypass the qualitative assessment, we perform a quantitative analysis. The estimated fair value is based on internal projections of expected future cash flows. If a brand intangible asset's estimated current fair value is less than its respective carrying value, the excess of the carrying value over the estimated fair value is recognized in our consolidated statements of operations as an impairment loss. Intangible Assets with Finite Useful Lives We have certain finite lived intangible assets that were initially recorded at their fair value at the time of the Merger. These intangible assets consist of management contracts, franchise contracts, leases, certain proprietary technologies and our Hilton Honors guest loyalty program. Additionally, we capitalize cash consideration paid to incentivize hotel owners to enter into management and franchise contracts with us as contract acquisition costs and the incremental costs to obtain or fulfill the contracts as development commissions, which are generally fixed. We also capitalize costs incurred to develop internal-use computer software and costs to acquire software licenses, as well as internal and external costs incurred in connection with the development of upgrades or enhancements that result in additional information technology functionality. Intangible assets with finite useful lives are amortized using the straight-line method over their respective estimated useful lives, which for contract acquisition costs and development commissions is the contract term, including any renewal periods that are at our sole option. These estimated useful lives are generally as follows: management contracts recorded at the Merger ( 13 to 16 years); management contract acquisition costs and development commissions ( 20 to 30 years); franchise contracts recorded at the Merger ( 12 to 13 years); franchise contract acquisition costs and development commissions ( 10 to 20 years); leases ( 12 to 35 years); Hilton Honors ( 16 years); and capitalized software development costs ( 3 years). In our consolidated statements of operations, the amortization of these intangible assets, excluding contract acquisition costs, is included in depreciation and amortization expense, and the amortization of contract acquisition costs is recognized as a reduction to franchise and licensing fees and base and other management fees, based on contract type. Costs incurred prior to the acquisition of a contract, such as external legal costs, are expensed as incurred and included in general and administrative expenses in our consolidated statements of operations. Cash flows for contract acquisition costs and development commissions are included as operating activities in our consolidated statements of cash flows, and cash flows for software development costs are included as investing activities. We review all finite lived intangible assets for impairment when indicators of impairment exist. We perform an analysis to determine the recoverability of the asset group carrying value by comparing the expected undiscounted future cash flows to the net book value of the asset group. If the carrying value of the asset group is not recoverable, we recognize an impairment loss for the excess carrying value over the estimated fair value in our consolidated statements of operations. Property and Equipment Property and equipment are recorded at cost. Costs of improvements that extend the economic life or improve service potential are also capitalized. Capitalized costs are depreciated over their estimated useful lives. Costs for normal repairs and maintenance are expensed as incurred. Depreciation is recorded using the straight-line method over the assets' estimated useful lives, which are generally as follows: buildings and improvements ( 8 to 40 years), furniture and equipment ( 3 to 8 years) and computer equipment ( 3 to 5 years). Leasehold improvements are depreciated over the shorter of the estimated useful life, based on the estimates above, or the lease term. We evaluate the carrying value of our property and equipment if there are indicators of impairment. We perform an analysis to determine the recoverability of the asset group carrying value by comparing the expected undiscounted future cash flows to the net book value of the asset group. If it is determined that the expected undiscounted future cash flows are less than the net carrying value of the asset group, the excess of the net carrying value over the estimated fair value is recorded in our consolidated statements of operations within impairment loss. Fair value is generally estimated using valuation techniques that consider the discounted cash flows of the asset group using discount and capitalization rates deemed reasonable for the type of assets, as well as prevailing market conditions, appraisals, recent similar transactions in the market and, if appropriate and available, current estimated net sales proceeds from pending offers. If sufficient information exists to reasonably estimate the fair value of a conditional asset retirement obligation, including environmental remediation liabilities, we recognize the fair value of the obligation when the obligation is incurred, which is generally upon acquisition, construction or development or through the normal operation of the asset. Contract Liabilities Contract liabilities relate to: (i) advance consideration received from hotel owners at contract inception for services considered to be part of the contract performance obligations, such as application, initiation and other fees; (ii) advance consideration received for certain indirect reimbursements, such as system implementation fees; and (iii) amounts received when points are issued under Hilton Honors, but for which revenue is not yet recognized, since the related points are not yet redeemed. Contract liabilities related to advance consideration received for fees and certain indirect reimbursements are recognized as revenue over the term of the related contract. Contract liabilities related to amounts received for Hilton Honors are recognized as revenue when the points are redeemed for a free good or service by the Hilton Honors member, which, on average, occurs within two years of points issuance. Contract liabilities are included in deferred revenues in our consolidated balance sheets. Hilton Honors Hilton Honors is our guest loyalty and marketing program provided to our hotel and resort properties. Nearly all of our managed, franchised, owned and leased properties participate in the Hilton Honors program. Hilton Honors members earn points based on their spending at our participating properties and through participation in affiliated partner programs. When points are earned by Hilton Honors members, they are provided with a substantive right to free or discounted goods or services in the future upon accumulation of the required level of Hilton Honors points. Points may be redeemed for the right to stay at participating properties, as well as for other goods and services from third parties, including, but not limited to, airlines, car rentals, cruises, vacation packages, shopping and dining. As points are issued to a Hilton Honors member, the property or program partner pays Hilton Honors based on an estimated cost per point for the costs of operating the program, which include marketing, promotion, communication and administrative expenses, as well as the estimated cost of award redemptions. When these payments are received we record amounts equal to the estimated cost per point of the future redemption obligation within the liability for guest loyalty program and any amounts received in excess of the estimated cost per point within deferred revenues in our consolidated balance sheets. We engage outside actuaries to assist in determining the fair value of the future redemption obligation using statistical formulas that project future point redemptions based on factors that include historical experience, an estimate of points that will eventually be redeemed, which includes an estimate of "breakage" for points that will never be redeemed, and the cost of reimbursing properties and other third parties with respect to other redemption opportunities available to Hilton Honors members. When points are issued as a result of a stay at an owned or leased hotel, we recognize a reduction in owned and leased hotel revenues, since we are also the guest loyalty program sponsor. For the Hilton Honors fees that are charged to the participating properties, we allocate the fees to the substantive right created by the Hilton Honors points that are issued using the variable consideration allocation guidance, since the fees are directly related to the issuance of Hilton Honors points to the Hilton Honors member and Hilton's efforts to satisfy the future redemption of those Hilton Honors points. The transaction prices for the Hilton Honors points are reduced by the expected payments to the third parties that will provide the free or discounted room or service using the actuarial projection of the cost per point. The remaining transaction price is then further allocated to the points that are expected to be redeemed, adjusting the points that are issued for estimated breakage, and recognized when those points are redeemed. While the points are outstanding, both the estimate of the expected payments to third parties (cost per point) and the estimated breakage are reevaluated, and the amount of revenue recognized when each point is redeemed is adjusted so that the final amount allocated to the substantive right of the customer to use the point is reflective of the amount retained for providing the free or discounted goods and services, net of the payments to third parties and points not redeemed. We also earn licensing fees from co-brand credit card arrangements (see "Management and franchise revenues" within the "Revenue Recognition" section above). The co-brand license fee is allocated between two performance obligations based on their estimated standalone selling prices: (i) an IP license using the relief-from-royalty method and (ii) substantive rights for free or discounted goods or services to the credit card customers using a cost plus method based on an evaluation of other third-party administrators. We satisfy our performance obligation related to points issued under Hilton Honors when points are redeemed for a free or discounted good or service by the Hilton Honors member, and we satisfy our remaining performance obligations over time as the customer simultaneously receives and consumes the benefits of the goods or services provided. Hilton Honors reimburses participating properties and applicable third parties when points are redeemed by members, at which time the redemption obligation is reduced and the related deferred revenue is recognized in other revenues from managed and franchised properties in our consolidated statements of operations. Additionally, when Hilton Honors members redeem award certificates at our owned and leased hotels, we recognize room revenue, included in owned and leased hotel revenues in our consolidated statements of oper

Discontinued Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2018
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued Operations On January 3, 2017, we completed the spin-offs of Park and HGV via a pro rata distribution to each of Hilton's stockholders of record, as of close of business on December 15, 2016, of 100 percent of the outstanding common stock of each of Park and HGV (the "Spin-Off Distribution"). Each Hilton stockholder received one share of Park common stock for every five shares of Hilton common stock and one share of HGV common stock for every ten shares of Hilton common stock. Following the spin-offs, Hilton did not retain any ownership interest in Park or HGV. Both Park and HGV have their common stock listed on the New York Stock Exchange under the symbols "PK" and "HGV," respectively. In connection with the spin-offs, on January 2, 2017, Hilton entered into several agreements with Park and HGV that govern Hilton's relationship with them following the Spin-Off Distribution, including: (i) a Distribution Agreement; (ii) an Employee Matters Agreement; (iii) a Tax Matters Agreement; (iv) a Transition Services Agreement ("TSA"); (v) a license agreement with HGV; (vi) a Tax Stockholders Agreement; and (vii) management and franchise contracts with Park. Under the TSA with Park and HGV, Hilton or one of its affiliates provided Park and HGV certain services for a period of up to two years from the date of the TSA to facilitate an orderly transition following the Spin-Off Distribution. The services that Hilton provided under the TSA included: finance; information technology; human resources and compensation; facilities; legal and compliance; and other services. The entity that provided the services was compensated for such services at agreed amounts as set forth in the TSA. The license agreement with HGV grants HGV the exclusive right, for an initial term of 100 years , to use certain Hilton marks and IP in its timeshare business, subject to the terms and conditions of the agreement. HGV pays a royalty fee of five percent of gross revenues, as defined in the agreement, to Hilton, as well as specified additional fees and reimbursements. Additionally, during the term of the agreement, HGV will participate in Hilton's guest loyalty program, Hilton Honors. Under the management and franchise contracts with Park, Park pays management fees for various services that Hilton provides to support the operations of their hotels, as well as royalty fees for the licensing of Hilton's hotel brands. Additionally, payroll and related costs, certain other operating costs, marketing expenses and other expenses associated with Hilton's brands and shared services are reimbursed to Hilton by Park pursuant to the terms of the management and franchise contracts. Financial Information During the years ended December 31, 2018 and 2017 , we recognized $154 million and $157 million , respectively, of management and franchise fees and $1,167 million and $1,197 million , respectively, of other revenues from managed and franchised properties under our management and franchise contracts with Park. We also recognized franchise and licensing fees under our license agreement w ith HGV of $98 million and $87 million , respectively. Prior to the spin-offs, the results of Park were reported in our ownership segment and the results of HGV were reported in our timeshare segment. Following the spin-offs, we do not report a timeshare segment, as we no longer have timeshare operations. The following table presents the results of operations of Park and HGV that were included in discontinued operations in our consolidated statement of operations for the year ended December 31, 2016: (in millions) Total revenues from discontinued operations $ 4,236 Expenses Owned and leased hotels 1,770 Timeshare 942 Depreciation and amortization 320 Other 298 Total expenses from discontinued operations 3,330 Gain on sales of assets, net 1 Operating income from discontinued operations 907 Non-operating loss, net (210 ) Income from discontinued operations before income taxes 697 Income tax expense (326 ) Income from discontinued operations, net of taxes 371 Income from discontinued operations attributable to noncontrolling interests, net of taxes (6 ) Income from discontinued operations attributable to Hilton stockholders, net of taxes $ 365 The following table presents selected financial information of Park and HGV that was included in our consolidated statement of cash flows for the year ended December 31, 2016: (in millions) Non-cash items included in net income: Depreciation and amortization $ 320 Gain on sales of assets, net (1 ) Investing activities: Capital expenditures for property and equipment $ (255 )

Revenues from Contracts with Cu

Revenues from Contracts with Customers	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenues from Contracts with Customer	Revenues from Contracts with Customers Contract Liabilities The following table summarizes the activity of our contract liabilities, which are classified as a component of current and long-term deferred revenues, during the six months ended June 30, 2019 : (in millions) Balance as of December 31, 2018 $ 1,060 Cash received in advance and not recognized as revenue (1) 220 Revenue recognized (1) (135 ) Other (2) (92 ) Balance as of June 30, 2019 $ 1,053 ____________ (1) Primarily related to Hilton Honors, our guest loyalty program. (2) Primarily the result of changes in estimated transaction prices for our performance obligations related to points issued under Hilton Honors, which had no effect on revenues. We recognized revenues that were previously deferred as contract liabilities of $78 million and $56 million du ring the three months ended June 30, 2019 and 2018 , respectively, and $116 million during the six months ended June 30, 2018 . Performance Obligations As of June 30, 2019 , we had $438 million of deferred revenues related to unsatisfied performance obligations related to Hilton Honors that will be recognized as revenues when the points are redeemed, which we estimate will occur over the next two years . Additionally, we had $615 million of deferred revenues related to application, initiation and licensing fees, which are expected to be recognized as revenues in future periods over the terms of the related contracts.	Revenues from Contracts with Customers Contract Liabilities The following table summarizes the activity of our contract liabilities during the year ended December 31, 2018: in millions Balance as of December 31, 2017 $ 1,087 Cash received in advance and not recognized as revenue (1) 377 Revenue recognized (1) (229 ) Other (2) (175 ) Balance as of December 31, 2018 $ 1,060 ____________ (1) Primarily related to Hilton Honors. (2) Primarily the result of changes in estimated transaction prices for our performance obligations related to points issued under Hilton Honors, which had no effect on revenues. We recognized revenues that were previously deferred as contract liabilities of $132 million and $211 million during the years ended December 31, 2017 and 2016, respectively. Performance Obligations As of December 31, 2018 , we had $471 million of deferred revenues related to unsatisfied performance obligations under Hilton Honors that will be recognized as revenues when the points are redeemed, which we estimate will occur over the next two years . Additionally, we had $589 million

Consolidated Variable Interest

Consolidated Variable Interest Entities	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entity Disclosure [Text Block]	Consolidated Variable Interest Entities As of June 30, 2019 and December 31, 2018 , we consolidated two variable interest entities ("VIEs") that lease hotel properties and, as of December 31, 2018 , we also consolidated one VIE that is a management company. We consolidated these VIEs, since we are the primary beneficiary, having the power to direct the activities that most significantly affect their economic performance. Additionally, we have the obligation to absorb their losses and the right to receive benefits that could be significant to them. The assets of our consolidated VIEs are only available to settle the obligations of the respective entities. In June 2019, the VIE that is a management company, which we had previously consolidated, sold its assets. As a result of the sale, we deconsolidated $7 million of total assets and $3 million of total liabilities, as we no longer had the power to direct the activities that most significantly affect the VIE's economic performance. See Note 12 : " Stockholders' Equity (Deficit) and Accumulated Other Comprehensive Loss " for additional information. Our condensed consolidated balance sheets included the assets and liabilities of the VIEs that we consolidated as of the respective periods, which primarily comprised the following: June 30, December 31, 2019 2018 (in millions) Cash and cash equivalents $ 72 $ 71 Property and equipment, net 73 68 Deferred income tax assets 51 53 Other non-current assets 61 58 Accounts payable, accrued expenses and other 52 41 Long-term debt (1) 204 205 Other long-term liabilities 15 15 ____________ (1) Includes finance lease liabilities of $186 million and $187 million as of June 30, 2019 and December 31, 2018 , respectively. We did not provide any financial or other support to any VIEs that we were not previously contractually required to provide during the six months ended June 30, 2019 and 2018 .	Consolidated Variable Interest Entities As of December 31, 2018 and 2017 , we consolidated three VIEs: two entities that lease hotel properties and one management company. We consolidated these VIEs, since we are the primary beneficiaries of them as we have the power to direct the activities that most significantly affect their economic performance. Additionally, we have the obligation to absorb their losses and the right to receive benefits that could be significant to them. The assets of our consolidated VIEs are only available to settle the obligations of the respective entities. Our consolidated balance sheets included the assets and liabilities of these entities, which primarily comprised the following: December 31, 2018 2017 (in millions) Cash and cash equivalents $ 71 $ 73 Accounts receivable, net 15 16 Property and equipment, net 68 57 Deferred income tax assets 53 56 Other non-current assets 58 57 Accounts payable, accrued expenses and other 41 43 Long-term debt (1) 205 212 Other long-term liabilities 15 13 ____________ (1) Includes capital lease obligations of $187 million and $191 million as of December 31, 2018 and 2017, respectively. During the years ended December 31, 2018 , 2017 and 2016 we did not provide any financial or other support to any VIEs that we were not previously contractually required to provide, nor do we intend to provide such support in the future.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets Disclosure [Text Block]	Amortizing Intangible Assets Amortizing intangible assets were as follows: June 30, 2019 Gross Carrying Value Accumulated Amortization Net Carrying Value (in millions) Management and franchise contracts: Management and franchise contracts recorded at Merger (1) $ 2,232 $ (1,960 ) $ 272 Contract acquisition costs 548 (108 ) 440 Development commissions and other 122 (17 ) 105 $ 2,902 $ (2,085 ) $ 817 Other intangible assets: Leases (1) $ 287 $ (167 ) $ 120 Capitalized software costs 547 (358 ) 189 Hilton Honors (1) 338 (247 ) 91 Other (1) 34 (34 ) — $ 1,206 $ (806 ) $ 400 December 31, 2018 Gross Carrying Value Accumulated Amortization Net Carrying Value (in millions) Management and franchise contracts: Management and franchise contracts recorded at Merger (1) $ 2,228 $ (1,873 ) $ 355 Contract acquisition costs 525 (101 ) 424 Development commissions and other 108 (15 ) 93 $ 2,861 $ (1,989 ) $ 872 Other intangible assets: Leases (1) $ 288 $ (161 ) $ 127 Capitalized software costs 503 (321 ) 182 Hilton Honors (1) 338 (236 ) 102 Other (1) 38 (34 ) 4 $ 1,167 $ (752 ) $ 415 ____________ (1) Represents intangible assets that were initially recorded at their fair value as part of the October 24, 2007 transaction whereby we became a wholly owned subsidiary of affiliates of The Blackstone Group L.P (the "Merger"). Amortization of our amortizing intangible assets was as follows: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 (in millions) Recognized in depreciation and amortization expense (1) $ 71 $ 66 $ 141 $ 135 Recognized as a reduction of franchise and licensing fees and base and other management fees 7 7 14 14 ____________ (1) Includes amortization expense of $51 million and $52 million for the three months ended June 30, 2019 and 2018 , respectively, and $102 million and $103 million for the six months ended June 30, 2019 and 2018 , respectively, associated with assets that were initially recorded at their fair value at the time of the Merger. We estimate future amortization of our amortizing intangible assets as of June 30, 2019 to be as follows: Recognized in Depreciation and Amortization Expense Recognized as a Reduction of Franchise and Licensing Fees and Base and Other Management Fees Year (in millions) 2019 (remaining) $ 141 $ 13 2020 250 26 2021 110 25 2022 81 23 2023 51 23 Thereafter 144 330 $ 777 $ 440
Goodwill and Intangible Assets		Goodwill and Intangible Assets Goodwill Our goodwill balances, by reporting unit, were as follows: Ownership (1) Management and Franchise (2) Total (in millions) Balance as of December 31, 2016 $ 184 $ 5,034 $ 5,218 Spin-off of Park (91 ) — (91 ) Foreign currency translation 11 52 63 Balance as of December 31, 2017 104 5,086 5,190 Foreign currency translation (5 ) (25 ) (30 ) Balance as of December 31, 2018 $ 99 $ 5,061 $ 5,160 ____________ (1) Amounts for the ownership reporting unit include the following gross carrying values and accumulated impairment losses for the periods presented: Gross Carrying Value Accumulated Impairment Losses Net Carrying Value (in millions) Balance as of December 31, 2016 $ 856 $ (672 ) $ 184 Spin-off of Park (423 ) 332 (91 ) Foreign currency translation 11 — 11 Balance as of December 31, 2017 444 (340 ) 104 Foreign currency translation (5 ) — (5 ) Balance as of December 31, 2018 $ 439 $ (340 ) $ 99 (2) There were no accumulated impairment losses for the management and franchise reporting unit as of December 31, 2018, 2017 and 2016. Intangible Assets Changes to our brands intangible assets from December 31, 2017 to December 31, 2018 were due to foreign currency translations. Amortizing intangible assets were as follows: December 31, 2018 Gross Carrying Value Accumulated Amortization Net Carrying Value (in millions) Management and franchise contracts: Management and franchise contracts recorded at Merger (1) $ 2,228 $ (1,873 ) $ 355 Contract acquisition costs 525 (101 ) 424 Development commissions 108 (15 ) 93 $ 2,861 $ (1,989 ) $ 872 Other intangible assets: Leases (1) $ 288 $ (161 ) $ 127 Capitalized software costs 503 (321 ) 182 Hilton Honors (1) 338 (236 ) 102 Other (1) 38 (34 ) 4 $ 1,167 $ (752 ) $ 415 December 31, 2017 Gross Carrying Value Accumulated Amortization Net Carrying Value (in millions) Management and franchise contracts: Management and franchise contracts recorded at Merger (1) $ 2,242 $ (1,716 ) $ 526 Contract acquisition costs 416 (74 ) 342 Development commissions 97 (12 ) 85 $ 2,755 $ (1,802 ) $ 953 Other intangible assets: Leases (1) $ 301 $ (153 ) $ 148 Capitalized software costs 585 (428 ) 157 Hilton Honors (1) 341 (217 ) 124 Other (1) 38 (34 ) 4 $ 1,265 $ (832 ) $ 433 ____________ (1) Includes intangible assets that were initially recorded at their fair value at the time of the Merger. Amortization of our amortizing intangible assets was as follows: Year Ended December 31, 2018 2017 2016 (in millions) Recognized in depreciation and amortization expense (1) $ 271 $ 277 $ 301 Recognized as a reduction of franchise and licensing fees and base and other management fees 27 17 16 ____________ (1) Includes amortization expense that was associated with assets recorded at their fair value at the time of the Merger of $204 million , $206 million and $208 million for the years ended December 31, 2018 , 2017 and 2016 , respectively, and amortization expense on capitalized software costs of $62 million , $67 million and $87 million , respectively. We estimate future amortization of our amortizing intangible assets as of December 31, 2018 to be as follows: Recognized in Depreciation and Amortization Expense Recognized as a Reduction of Franchise and Licensing Fees and Base and Other Management Fees Year (in millions) 2019 $ 279 $ 27 2020 236 25 2021 97 24 2022 66 22 2023 48 22 Thereafter 137 304 $ 863 $ 424

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment Disclosure [Text Block]	Property and Equipment Property and equipment were as follows: December 31, 2018 2017 (in millions) Land $ 12 $ 12 Buildings and leasehold improvements (1) 456 428 Furniture and equipment 356 346 Construction-in-progress 24 17 848 803 Accumulated depreciation (1) (481 ) (450 ) $ 367 $ 353 ____________ (1) Buildings and leasehold improvements included $65 million and $68 million of capital lease assets as of December 31, 2018 and 2017 , respectively, with associated accumulated amortization of $45 million and $43 million , respectively. Depreciation expense on property and equipment was $54 million , $59 million and $52 million during the years ended December 31, 2018 , 2017 and 2016

Accounts Payable, Accrued Expen

Accounts Payable, Accrued Expenses and Other	12 Months Ended
	Dec. 31, 2018
Payables and Accruals [Abstract]
Accounts Payable, Accrued Liabilities, and Other	Accounts Payable, Accrued Expenses and Other Accounts payable, accrued expenses and other were as follows: December 31, 2018 2017 (in millions) Accrued employee compensation and benefits $ 532 $ 502 Accounts payable 283 282 Insurance reserves, current 199 189 Other accrued expenses (1) 516 443 $ 1,530 $ 1,416 ____________ (1)

Debt

Debt	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Debt	Debt Long-term debt balances, including obligations for finance leases, and associated interest rates and maturities as of June 30, 2019 , were as follows: June 30, December 31, 2019 2018 (in millions) Senior secured term loan facility with a rate of 4.15%, due 2026 $ 2,619 $ 3,119 Senior notes with a rate of 4.250%, due 2024 1,000 1,000 Senior notes with a rate of 4.625%, due 2025 900 900 Senior notes with a rate of 5.125%, due 2026 1,500 1,500 Senior notes with a rate of 4.875%, due 2027 600 600 Senior notes with a rate of 4.875%, due 2030 1,000 — Finance lease liabilities with an average rate of 5.80%, due 2019 to 2030 260 225 Other debt with a rate of 3.08% due 2026 18 17 7,897 7,361 Less: unamortized deferred financing costs and discount (88 ) (79 ) Less: current maturities of long-term debt (1) (37 ) (16 ) $ 7,772 $ 7,266 ____________ (1) Represents current maturities of finance lease liabilities. Our senior secured credit facilities consist of a senior secured revolving credit facility (the "Revolving Credit Facility") and a senior secured term loan facility (the "Term Loans"). The obligations of our senior secured credit facilities are unconditionally and irrevocably guaranteed by the Parent and substantially all of its direct and indirect wholly owned domestic subsidiaries. In June 2019, we amended the Term Loans to extend the maturity date to June 2026 with a discount of 0.25 percent and also incurred $2 million of debt issuance costs. We also amended the Revolving Credit Facility to increase the borrowing capacity to $1.75 billion , $250 million of which is available in the form of letters of credit, and extended the maturity date to June 2024. In connection with this amendment, we incurred $7 million of debt issuance costs, which were included in other non-current assets in our condensed consolidated balance sheet as of June 30, 2019. As of June 30, 2019 , we had $59 million of outstanding letters of credit, resulting in an available borrowing capacity under the Revolving Credit Facility of $1.69 billion . We are required to pay a commitment fee of 0.125 percent per annum under the Revolving Credit Facility in respect of the unused commitments thereunder. In June 2019, we issued $1.0 billion aggregate principal amount of 4.875% Senior Notes due 2030 (the "2030 Senior Notes"), and incurred $13 million of debt issuance costs. Interest on the 2030 Senior Notes is payable semi-annually in arrears on January 15 and July 15 of each year, beginning January 2020. We used a portion of the net proceeds from the issuance of the 2030 Senior Notes to repay $500 million outstanding on our Term Loans and to repay $225 million outstanding under our Revolving Credit Facility. In connection with the repayment of the Term Loans, we recognized $8 million of fees and unamortized deferred financing costs and discount, which were included in other non-operating income (loss), net, in our condensed consolidated statements of operations for the three and six months ended June 30, 2019 . The 4.250% Senior Notes due 2024 (the "2024 Senior Notes"), the 4.625% Senior Notes due 2025 (the "2025 Senior Notes"), the 5.125% Senior Notes due 2026 (the "2026 Senior Notes"), the 4.875% Senior Notes due 2027 (the "2027 Senior Notes") and the 2030 Senior Notes are guaranteed on a senior unsecured basis by the Parent and substantially all of its direct and indirect wholly owned domestic subsidiaries that are themselves not issuers of the applicable series of senior notes. See Note 15 : " Condensed Consolidating Guarantor Financial Information " for additional information. The contractual maturities of our long-term debt as of June 30, 2019 were as follows: Year (in millions) 2019 (remaining) $ 19 2020 35 2021 28 2022 20 2023 21 Thereafter 7,774 $ 7,897	Debt Long-term Debt Long-term debt balances, including obligations for capital leases, and associated interest rates as of December 31, 2018 were as follows: December 31, 2018 2017 (in millions) Senior notes with a rate of 4.250%, due 2024 $ 1,000 $ 1,000 Senior notes with a rate of 4.625%, due 2025 900 900 Senior notes with a rate of 5.125%, due 2026 1,500 — Senior notes with a rate of 4.875%, due 2027 600 600 Senior secured term loan facility with a rate of 4.26%, due 2023 3,119 3,929 Capital lease obligations with an average rate of 6.43%, due 2021 to 2030 225 233 Other debt with an average rate of 3.08%, due 2026 17 21 7,361 6,683 Less: unamortized deferred financing costs and discount (79 ) (81 ) Less: current maturities of long-term debt (1) (16 ) (46 ) $ 7,266 $ 6,556 ____________ (1) Balance as of December 31, 2017 is net of unamortized deferred financing costs and discount attributable to current maturities of long-term debt. Senior Notes In April 2018, we issued $1.5 billion aggregate principal amount of 5.125% Senior Notes due 2026 (the "2026 Senior Notes"), and incurred $21 million of debt issuance costs. Interest on the 2026 Senior Notes is payable semi-annually in arrears on May 1 and November 1 of each year, beginning November 2018. We used a portion of the net proceeds from the issuance of the 2026 Senior Notes, together with borrowings under our senior secured revolving credit facility (the "Revolving Credit Facility") and available cash, to repurchase 16.5 million shares of our common stock from HNA for $1,171 million and repay $500 million outstanding under our senior secured term loan facility (the "Term Loans"). See "Senior Secured Credit Facilities" below for additional information. In March 2017, we used the proceeds from issuances of the 4.625% Senior Notes due 2025 (the "2025 Senior Notes") and the 4.875% Senior Notes due 2027 (the "2027 Senior Notes"), to redeem in full $1.5 billion of Senior Notes due 2021 (the "2021 Senior Notes"). In connection with the repayment, we paid a redemption premium of $42 million and accelerated the recognition of $18 million of unamortized deferred financing costs, which were included in loss on debt extinguishment in our consolidated statement of operations for the year ended December 31, 2017 . The 4.250% Senior Notes due 2024 (the "2024 Senior Notes"), the 2025 Senior Notes, the 2026 Senior Notes and the 2027 Senior Notes are guaranteed on a senior unsecured basis by the Parent and substantially all of its direct and indirect wholly owned domestic subsidiaries. See Note 23: "Condensed Consolidating Guarantor Financial Information" for additional information. Senior Secured Credit Facilities Our senior secured credit facility consists of a $1.0 billion Revolving Credit Facility and the Term Loans. The obligations of our senior secured credit facility are unconditionally and irrevocably guaranteed by the Parent and substantially all of its direct and indirect wholly owned domestic subsidiaries. During the year ended December 31, 2018, we borrowed $150 million under the Revolving Credit Facility, and all amounts borrowed were repaid in the same period. Subsequent to December 31, 2018, we drew a net $100 million under the Revolving Credit Facility. In December 2018, we repaid an additional $300 million outstanding under our Term Loans, and as a result of the repayments made during the year ended December 31, 2018 , we accelerated the recognition of $8 million of unamortized deferred financing costs and discount, which were included in other non-operating income, net in our consolidated statement of operations. Additionally, the interest rate on the remaining balance of the Term Loans was reduced by 25 basis points to LIBOR plus 175 basis points . As of December 31, 2018 , we had $63 million of letters of credit outstanding under our Revolving Credit Facility and a borrowing capacity of $937 million . We are required to pay a commitment fee of 0.125 percent per annum under the Revolving Credit Facility in respect of the unused commitments thereunder. Debt Maturities The contractual maturities of long-term debt as of December 31, 2018 , were as follows: Year (in millions) 2019 $ 16 2020 17 2021 18 2022 19 2023 3,139 Thereafter 4,152 $ 7,361

Other Liabilities

Other Liabilities	12 Months Ended
	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
Other Liabilities	Other Liabilities Other long-term liabilities were as follows: December 31, 2018 2017 (in millions) Pension obligations $ 145 $ 165 Other long-term tax liabilities 395 397 Deferred employee compensation and benefits 113 117 Insurance reserves (1) 146 162 Other 64 79 $ 863 $ 920 ____________ (1) Obligations related to insurance claims are expected to be satisfied, on average, over the next three years .

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Text Block]	Derivative Instruments and Hedging Activities Cash Flow Hedges In May 2017, we began hedging foreign exchange-based cash flow variability in certain of our foreign currency denominated management and franchise fees using forward contracts (the "Fee Forward Contracts"). We elected to designate these Fee Forward Contracts as cash flow hedges for accounting purposes. As of December 31, 2018 , the Fee Forward Contracts had an aggregate notional amount of $98 million and maturities of 24 months or less. In March 2017, we entered into two interest rate swap agreements with notional amounts of $1.6 billion and $750 million to swap one-month LIBOR on the Term Loans to fixed rates of 1.98 percent and 2.02 percent, respectively, through March 2022 . In May 2018, we settled the interest rate swap with a notional amount of $750 million and received $18 million from the counterparty. Concurrently, we entered into an interest rate swap agreement with a notional amount of $1.6 billion , which swaps one-month LIBOR on the Term Loans to a fixed rate of 3.03 percent, for a term from March 2022 to March 2023 . We elected to designate these interest rate swaps as cash flow hedges for accounting purposes. Non-designated Hedges As of December 31, 2018 , we held short-term forward contracts with an aggregate notional amount of $412 million to offset exposure to fluctuations in certain of our foreign currency denominated cash balances. We elected not to designate these forwar d contracts as hedging instruments. Depending on the fair value of each contract, we classify it as an asset or liability. In 2016, we dedesignated four interest rate swaps that were previously designated as cash flow hedges as they no longer met the criteria for hedge accounting. These interest rate swaps, which had an aggregate notional amount of $1.45 billion and swapped three-month LIBOR on the Term Loans to a fixed rate of 1.87 percent , were settled in 2017. Fair Value of Derivative Instruments We measure our derivative instruments at fair value, which is estimated using a discounted cash flow analysis, and we consider the inputs used to measure the fair value as Level 2 within the fair value hierarchy. The discounted cash flow analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs of similar instruments, including interest rate curves and spot and forward rates, as applicable, as well as option volatility. The fair values of our derivative instruments in our consolidated balance sheets were as follows: December 31, Balance Sheet Classification 2018 2017 (in millions) Cash Flow Hedges: Interest rate swaps Other non-current assets $ 16 $ 11 Forward contracts Other current assets 1 — Forward contracts Accounts payable, accrued expenses and other — 1 Non-designated Hedges: Forward contracts Other current assets 1 4 Forward contracts Accounts payable, accrued expenses and other 2 1 Earnings Effect of Derivative Instruments The gains and losses recognized in our consolidated statements of operations and consolidated statements of comprehensive income before any effect for income taxes were as follows: Year Ended December 31, Classification of Gain (Loss) Recognized 2018 2017 2016 (in millions) Cash Flow Hedges (1)(2) : Interest rate swaps Other comprehensive income (loss) $ 22 $ (5 ) $ (15 ) Interest rate swaps Interest expense (1 ) (16 ) (8 ) Forward contracts Other comprehensive income (loss) 2 (1 ) N/A Non-designated Hedges: Interest rate swaps (3) Other non-operating income, net N/A 2 4 Interest rate swaps (3) Interest expense (5 ) (10 ) (4 ) Forward contracts Gain (loss) on foreign currency transactions (9 ) 12 7 ____________ (1) There were no amounts recognized in earnings related to hedge ineffectiveness or amounts excluded from hedge effectiveness testing during the years ended December 31, 2018 , 2017 and 2016 . (2) The earnings effect of the Fee Forward Contracts on fee revenues for the years ended December 31, 2018 and 2017 was less than $1 million. (3) These amounts relate to the interest rate swaps that we have dedesignated and settled. The amounts recognized in interest expense were reclassified from accumulated other comprehensive loss as the underlying transactions occurred.

Fair Value Estimates

Fair Value Estimates	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements We did not elect the fair value measurement option for any of our financial assets or liabilities. The fair values of certain financial instruments and the hierarchy level we used to estimate the fair values are shown below; the fair values of financial instruments not included in these tables are estimated to be equal to their carrying values as of June 30, 2019 and December 31, 2018 : June 30, 2019 Hierarchy Level Carrying Value Level 1 Level 2 Level 3 (in millions) Assets: Cash equivalents $ 265 $ — $ 265 $ — Restricted cash equivalents 19 — 19 — Liabilities: Long-term debt (1) 7,531 5,149 — 2,624 Interest rate swaps 35 — 35 — December 31, 2018 Hierarchy Level Carrying Value Level 1 Level 2 Level 3 (in millions) Assets: Cash equivalents $ 87 $ — $ 87 $ — Restricted cash equivalents 18 — 18 — Interest rate swaps 16 — 16 — Liabilities: Long-term debt (1) 7,040 3,809 — 3,039 ____________ (1) The carrying values include unamortized deferred financing costs and discount. The carrying values and fair values exclude finance lease liabilities and other debt. We measure our interest rate swaps at fair value, which were estimated using a discounted cash flow analysis that reflects the contractual terms of the interest rate swaps, including the period to maturity, and uses observable market-based inputs of similar instruments, including interest rate curves, as applicable. Our interest rate swaps are included in other non-current assets or other long-term liabilities in our condensed consolidated balance sheets depending on their fair value.	Fair Value Measurements We did not elect the fair value measurement option for any of our financial assets or liabilities. The fair values of certain financial instruments and the hierarchy level we used to estimate the fair values are shown below; see Note 11 : " Derivative Instruments and Hedging Activities " for the fair value information of our derivatives and Note 15 : " Employee Benefit Plans " for fair value information of our pension assets: December 31, 2018 Hierarchy Level Carrying Value Level 1 Level 2 Level 3 (in millions) Assets: Cash equivalents $ 87 $ — $ 87 $ — Restricted cash equivalents 18 — 18 — Liabilities: Long-term debt (1) 7,040 3,809 — 3,039 December 31, 2017 Hierarchy Level Carrying Value Level 1 Level 2 Level 3 (in millions) Assets: Cash equivalents $ 284 $ — $ 284 $ — Restricted cash equivalents 12 — 12 — Liabilities: Long-term debt (1) 6,348 2,575 — 3,954 ____________ (1) The carrying values include unamortized deferred financing costs and discount. The carrying values and fair values exclude capital lease obligations and other debt. The fair values of financial instruments not included in these tables are estimated to be equal to their carrying values as of December 31, 2018 and 2017 . Our estimates of the fair values were determined using available market information and appropriate valuation methods. Considerable judgment is necessary to interpret market data and develop the estimated fair values. Cash equivalents and restricted cash equivalents primarily consisted of short-term interest-bearing money market funds with maturities of less than 90 days and time deposits. The estimated fair values were based on available market pricing information of similar financial instruments.

Leases

Leases	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Leases	Leases We lease hotel properties, land, corporate office space and equipment used at hotels and corporate offices, with our most significant lease liabilities related to hotel properties. As of June 30, 2019 , we leased 53 hotels under operating leases and six hotels under finance leases, two of which were the liabilities of consolidated VIEs and were non-recourse to us. Our hotel leases expire at various dates, with varying renewal and termination options. Supplemental balance sheet information related to leases as of June 30, 2019 was as follows: (dollars in millions) Operating leases: Operating lease right-of-use assets $ 891 Accounts payable, accrued expenses and other 131 Operating lease liabilities 1,066 Finance leases: Property and equipment, net $ 57 Current maturities of long-term debt 37 Long-term debt 223 Weighted average remaining lease term: Operating leases 13.0 years Finance leases 8.9 years Weighted average discount rate: Operating leases 3.74 % Finance leases 5.80 % The components of lease expense were as follows: Three Months Ended Six Months Ended June 30, 2019 June 30, 2019 (in millions) Operating lease expense for fixed payments $ 36 $ 73 Finance lease expense: Amortization of ROU assets 8 16 Interest on lease liabilities 3 7 Variable lease expense (1) 52 82 ____________ (1) Includes amounts related to operating leases and interest payments on finance leases. Lease expense for our operating leases for the year ended December 31, 2018 included $225 million of fixed lease expense and $142 million of variable lease expense. Supplemental cash flow information related to leases for the six months ended June 30, 2019 was as follows: (in millions) Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 90 Financing cash flows from finance leases 21 ROU assets obtained in exchange for lease liabilities in non-cash transactions: Operating leases 21 Finance leases 52 Our future minimum lease payments as of June 30, 2019 were as follows: Operating Finance Year (in millions) 2019 (remaining) $ 89 $ 26 2020 175 49 2021 161 40 2022 137 31 2023 122 30 Thereafter 872 166 Total minimum lease payments 1,556 342 Less: imputed interest (359 ) (82 ) Total lease liabilities $ 1,197 $ 260	Leases We lease hotel properties, land, corporate office space and equipment used at hotels and corporate offices. As of December 31, 2018 and 2017 , we leased 58 hotels and 59 hotels, respectively, under operating leases, and four hotels under capital leases, two of which were the liabilities of consolidated VIEs and were non-recourse to us. Our hotel leases expire at various dates from 2019 through 2067 , with varying renewal and termination options, and the majority expire before 2029 . Our operating leases require: (i) fixed lease payments, or minimum payments, as contractually stated in the lease agreement; (ii) variable lease payments, or contingent rentals, which are generally based on a percentage of the underlying asset's revenues or are dependent on changes in an index; or (iii) lease payments equal to the greater of the fixed or variable rent. In addition, we may be required to pay some, or all, of the capital costs for furniture, equipment and leasehold improvements in the hotel during the term of the lease. For operating leases, lease expense relating to fixed or minimum payments is recognized on a straight-line basis over the lease term and lease expense relating to variable payments is expensed as incurred, with amounts recognized in owned and leased hotel expenses and general and administrative expenses in our consolidated statements of operations. For capital leases, the amortization of the asset is recognized in depreciation and amortization expense in our consolidated statements of operations and is recognized over the shorter of the lease term or useful life of the underlying asset. The interest on the capital lease obligation is recognized in interest expense in our consolidated statements of operations. The future minimum rent payments as of December 31, 2018 , were as follows: Operating Capital Year (in millions) 2019 $ 206 $ 30 2020 191 30 2021 166 30 2022 134 29 2023 119 29 Thereafter 865 164 Total minimum lease payments $ 1,681 312 Less: amount representing interest (87 ) Present value of minimum lease payments $ 225 Lease expense for operating leases was as follows: Year Ended December 31, 2018 2017 2016 (in millions) Fixed $ 225 $ 183 $ 224 Contingent 142 101 98 $ 367 $ 284 $ 322

Income Taxes

Income Taxes	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes At the end of each quarter, we estimate the effective income tax rate expected to be applied for the full year. The effective income tax rate is determined by the level and composition of income (loss) before income taxes, which is subject to federal, state, local and foreign income taxes. We file income tax returns, including returns for our subsidiaries, with federal, state, local and foreign tax jurisdictions. We are under regular and recurring audit by the Internal Revenue Service ("IRS") and other taxing authorities on open tax positions. The timing of the resolution of tax audits is highly uncertain, as are the amounts, if any, that may ultimately be paid upon such resolution. Changes may result from the conclusion of ongoing audits, appeals or litigation in federal, state, local and foreign tax jurisdictions or from the resolution of various proceedings between the U.S. and foreign tax authorities. As of June 30, 2019 , we remain subject to federal and state examinations of our income tax returns for tax years from 2005 through 2017 and foreign examinations of our income tax returns for tax years from 1996 through 2018. Our total unrecognized tax benefits as of June 30, 2019 and December 31, 2018 were $323 million and $318 million , respectively. As of June 30, 2019 and December 31, 2018 , we had accrued approximately $44 million and $40 million , respectively, for interest and penalties related to our unrecognized tax benefits in our condensed consolidated balance sheets. Included in the balances of unrecognized tax benefits as of June 30, 2019 and December 31, 2018 was $312 million and $310 million , respectively, associated with positions that, if favorably resolved, would provide a benefit to our effective income tax rate. In April 2014, we received 30-day Letters from the IRS and the Revenue Agents Report ("RAR") for the 2006 and October 2007 tax years. We disagreed with several of the proposed adjustments in the RAR, filed a formal appeals protest with the IRS and did not make any tax payments related to this audit. The issues being protested in appeals relate to assertions by the IRS that: (i) certain foreign currency denominated intercompany loans from our foreign subsidiaries to certain U.S. subsidiaries should be recharacterized as equity for U.S. federal income tax purposes and constitute deemed dividends from such foreign subsidiaries to our U.S. subsidiaries; (ii) in calculating the amount of U.S. taxable income resulting from Hilton Honors, we should not reduce gross income by the estimated costs of future redemptions, but rather such costs would be deductible at the time the points are redeemed; and (iii) certain foreign currency denominated loans issued by one of our Luxembourg subsidiaries whose functional currency is the U.S. dollar ("USD"), should instead be treated as issued by one of our Belgian subsidiaries whose functional currency is the euro ("EUR"), and thus foreign currency gains and losses with respect to such loans should have been measured in EUR, instead of USD. In January 2016, we received a 30-day Letter from the IRS and the RAR for the December 2007 through 2010 tax years, which included proposed adjustments that reflect the carryover effect of the three protested issues from the 2006 through October 2007 tax years. These proposed adjustments are also being protested in appeals and formal appeals protests have been submitted. In April 2016, we requested a Technical Advice Memorandum ("TAM") from the IRS with respect to the treatment of the gains and losses recognized as a result of changes in foreign currency exchange rates on loans issued by our Luxembourg subsidiary. We received a taxpayer favorable TAM in October 2018 and this issue is no longer being pursued by the IRS for any of the open tax years. In September 2018, we received a 30-day Letter from the IRS and the RAR for the 2011 through 2013 tax years, which reflects proposed adjustments for the carryover effect of the two remaining protested issues from the 2006 through October 2007 tax years. The adjustments for the 2011 through 2013 tax years will also be protested in appeals and formal protests have been submitted. After receipt of the TAM relating to the Luxembourg subsidiary, the two remaining proposed adjustments sought by the IRS would result in additional U.S. federal tax owed of approximately $817 million , excluding interest and penalties and potential state income taxes. The portion of this amount related to Hilton Honors would result in a decrease to our future tax liability when the points are redeemed. We disagree with the IRS's position on each of these assertions and intend to vigorously contest them. However, based on continuing appeals process discussions with the IRS, we believe that it is more likely than not that we will not recognize the full benefit related to certain of the issues being appealed. Accordingly, as of June 30, 2019 , we had recorded $55 million of unrecognized tax benefits related to these issues.	Income Taxes Income Tax Provision Our tax provision includes federal, state and foreign income taxes payable. The domestic and foreign components of income from continuing operations before income taxes were as follows: Year Ended December 31, 2018 2017 2016 (in millions) U.S. income before tax $ 881 $ 632 $ 906 Foreign income (loss) before tax 197 121 (366 ) Income from continuing operations before income taxes $ 1,078 $ 753 $ 540 The components of our provision (benefit) for income taxes were as follows: Year Ended December 31, 2018 2017 2016 (in millions) Current: Federal $ 210 $ 239 $ 441 State 53 59 143 Foreign 60 95 70 Total current 323 393 654 Deferred: Federal (52 ) (667 ) (123 ) State (14 ) (35 ) 45 Foreign 52 (27 ) (19 ) Total deferred (14 ) (729 ) (97 ) Total provision (benefit) for income taxes $ 309 $ (336 ) $ 557 Reconciliations of our tax provision at the U.S. statutory rate to the provision (benefit) for income taxes were as follows: Year Ended December 31, 2018 2017 2016 (in millions) Statutory U.S. federal income tax provision $ 226 $ 264 $ 189 State income taxes, net of U.S. federal tax benefit 37 19 22 Impact of foreign operations 26 4 34 Effects of the TCJ Act 13 (600 ) — Corporate restructuring 9 — 477 Change in deferred tax asset valuation allowance (6 ) (48 ) (20 ) Provision (benefit) for uncertain tax positions 16 38 (139 ) Other, net (12 ) (13 ) (6 ) Provision (benefit) for income taxes $ 309 $ (336 ) $ 557 Restructuring During the year ended December 31, 2018, our controlled foreign corporations ("CFC") distributed the stock of certain subsidiaries (the "Distributions"). Subsequent to the Distributions, the distributed subsidiaries will now be includible in our U.S. federal and state income tax filings. As a result of the Distributions, we incurred deferred income tax expense of $9 million , including: (i) recording U.S. deferred tax liabilities related to the distributed subsidiaries of $12 million and (ii) remeasuring our existing deferred tax assets and liabilities and other tax liabilities at the effective tax rates at which they will reverse in future periods, resulting in a reduction of liabilities of $3 million . During the year ended December 31, 2016, we effected two corporate structuring transactions that included: (i) the organization of Hilton's assets and subsidiaries in preparation for the spin-offs and (ii) a restructuring of Hilton's international assets and subsidiaries (the "international restructuring"). The international restructuring involved a transfer of certain assets, including IP used in the international business, from U.S. subsidiaries to foreign subsidiaries, and became effective in December 2016. The transfer of the IP resulted in the recognition of tax expense representing the estimated U.S. tax expected to be paid in future years on income generated from the IP transferred to foreign subsidiaries. Due to the changes in the footprint of the Company and the expected applicable tax rates at which our domestic deferred tax assets and liabilities will reverse in future periods as a result of the described structuring activities, our estimated deferred effective tax rate increased for the year ended December 31, 2016 . In total, these structuring transactions, which became effective in December 2016, resulted in additional income tax expense of $477 million in the period. Tax Cuts and Jobs Act of 2017 We recognized a provisional benefit as of December 31, 2017 of $600 million , of which $569 million was the result of the remeasurement of U.S. deferred tax assets and liabilities and other tax liabilities. As of December 31, 2018 , we made adjustments to the provisional amounts recorded as of December 31, 2017 , as described below. • Deferred tax assets and liabilities and other tax liabilities. We remeasured deferred tax assets and liabilities and other tax liabilities based on the rates at which they are expected to reverse in the future, which is generally 21 percent . The provisional amounts recorded as of December 31, 2017 related to the remeasurement of our deferred tax assets and liabilities, uncertain tax position reserves and other tax liabilities were income tax benefits of $452 million , $33 million and $84 million , respectively. However, this remeasurement was based on estimates as of the enactment date of the TCJ Act and our existing analysis of the numerous complex tax law changes in the TCJ Act. Upon completing our analysis of the TCJ Act and associated regulations, we adjusted our provisional amount by recording an additional tax benefit of $10 million during the year ended December 31, 2018, which was included in income tax expense in our consolidated statements of operations. • Foreign taxation changes. A one-time transition tax is applied to foreign earnings previously not subjected to U.S. tax. The one-time transition tax is based on our total post-1986 earnings and profits ("E&P") that were previously deferred from U.S. income taxes, but is assessed at a lower tax rate than the federal corporate tax rate of 35 percent . We recorded a provisional amount for our one-time transition tax liability for our foreign subsidiaries based on estimates, as of the enactment date of the TCJ Act, for our controlled foreign subsidiaries and estimates of the total post-1986 E&P for noncontrolled foreign subsidiaries. We previously recorded a federal deferred tax liability for our deferred earnings at the statutory 35 percent rate, and the application of the transition tax results in these earnings being subjected to a lower rate, resulting in a provisional income tax benefit as of December 31, 2017 of $15 million . As a result of additional guidance issued by the U.S. Treasury Department, we refined our calculations and recorded an additional tax benefit of $2 million during the year ended December 31, 2018. Additionally, we had not recorded certain deferred tax assets, primarily related to E&P deficits, for some foreign subsidiaries based upon an expectation that no tax benefit from such assets would be realized within the foreseeable future. The recognition of tax benefits from the deferred tax assets previously not recorded resulted in an income tax benefit of $16 million during the year ended December 31, 2017. • Outside basis differences . With the changes made to the U.S. taxation of foreign entities, including the change to a territorial system of taxation, the introduction of a dividend participation exemption and the changes to the current taxation of GILTI, we determined our current method of calculating CFC outside basis should be revised to incorporate the TCJ Act changes. As a result, we recorded additional deferred tax liabilities of $31 million during the year ended December 31, 2018 within income tax expense (benefit) in our consolidated statement of operations. Our accounting for the effects of the TCJ Act was complete as of December 31, 2018. Deferred Income Taxes Deferred income taxes represent the tax effect of the differences between the book and tax bases of assets and liabilities plus carryforward items. The tax effects of the temporary differences and carryforwards that give rise to our net deferred taxes were as follows: December 31, 2018 2017 (in millions) Deferred tax assets: Net operating loss carryforwards $ 389 $ 395 Compensation 118 113 Reserves 18 39 Capital lease obligations 75 78 Deferred income 258 210 Other 42 52 Total gross deferred tax assets 900 887 Less: valuation allowance (399 ) (408 ) Deferred tax assets 501 479 Deferred tax liabilities: Brands (1,123 ) (1,122 ) Amortizing intangible assets (157 ) (177 ) Investment in foreign subsidiaries (29 ) — Deferred tax liabilities (1,309 ) (1,299 ) Net deferred taxes $ (808 ) $ (820 ) As of December 31, 2018 , we had foreign net operating loss carryforwards of $1.5 billion , which resulted in deferred tax assets of $389 million for foreign jurisdictions. Approximately $11 million of our deferred tax assets as of December 31, 2018 related to net operating loss carryforwards that will expire between 2019 and 2038 with less than $1 million of that amount expiring in 2019. Approximately $378 million of our deferred tax assets as of December 31, 2018 resulted from net operating loss carryforwards that are not subject to expiration. We believe that it is more likely than not that the benefit from certain foreign net operating loss carryforwards will not be realized. In recognition of this assessment, we provided a valuation allowance of $379 million as of December 31, 2018 on the deferred tax assets relating to the foreign net operating loss carryforwards. Our total valuation allowance relating to these net operating loss carryforwards and other deferred tax assets decreased $9 million during the year ended December 31, 2018 . Based on our consideration of all available positive and negative evidence, we determined that it was more likely than not that we would be able to realize the benefit of certain foreign deferred tax assets and released valuation allowances of $6 million against our foreign deferred tax assets. Additionally, other factors that did not have any impact on income tax expense, including revaluations of certain foreign deferred tax assets and their associated valuation allowances, resulted in a $3 million reduction of total valuation allowances. Tax Uncertainties We classify reserves for tax uncertainties within current income taxes payable and other long-term liabilities in our consolidated balance sheets. Reconciliations of the beginning and ending amounts of unrecognized tax benefits were as follows: Year Ended December 31, 2018 2017 2016 (in millions) Balance at beginning of year $ 283 $ 174 $ 315 Additions for tax positions related to prior years 37 3 77 Additions for tax positions related to the current year 16 126 9 Reductions for tax positions related to prior years (15 ) (10 ) (204 ) Settlements — (9 ) (21 ) Lapse of statute of limitations (3 ) (2 ) (2 ) Currency translation adjustment — 1 — Balance at end of year $ 318 $ 283 $ 174 The changes to our unrecognized tax benefits during the year ended December 31, 2018 were primarily related to uncertainty regarding the calculations of tax deductions claimed in recently filed tax returns, as well as the addition of current year reserves related to our Hilton Honors guest loyalty program. The changes to our unrecognized tax benefits during the year ended December 31, 2017 were primarily related to uncertainty regarding the valuation of certain tax assets in the U.S. and the United Kingdom. The changes to our unrecognized tax benefits during the year ended December 31, 2016 were primarily the result of items identified, resolved and settled as part of our ongoing U.S. federal audit. We recognize interest and penalties accrued related to uncertain tax positions in income tax expense (benefit) in our consolidated statements of operations. As of December 31, 2018 and 2017, we had accrued approximately $40 million and $33 million , respectively, for interest and penalties related to our unrecognized tax benefits in our consolidated balance sheets. Included in the balances of unrecognized tax benefits as of December 31, 2018 and 2017 were $310 million and $285 million , respectively, associated with positions that, if favorably resolved, would provide a benefit to our effective income tax rate. In April 2014, we received 30-day Letters from the Internal Revenue Service ("IRS") and the Revenue Agents Report ("RAR") for the 2006 and October 2007 tax years. We disagreed with several of the proposed adjustments in the RAR, filed a formal appeals protest with the IRS and did not make any tax payments related to this audit. The issues being protested in appeals relate to assertions by the IRS that: (i) certain foreign currency denominated intercompany loans from our foreign subsidiaries to certain U.S. subsidiaries should be recharacterized as equity for U.S. federal income tax purposes and constitute deemed dividends from such foreign subsidiaries to our U.S. subsidiaries; (ii) in calculating the amount of U.S. taxable income resulting from our Hilton Honors guest loyalty program, we should not reduce gross income by the estimated costs of future redemptions, but rather such costs would be deductible at the time the points are redeemed; and (iii) certain foreign currency denominated loans issued by one of our Luxembourg subsidiaries whose functional currency is USD, should instead be treated as issued by one of our Belgian subsidiaries whose functional currency is the euro, and thus foreign currency gains and losses with respect to such loans should have been measured in euros, instead of USD. In January 2016, we received a 30-day Letter from the IRS and the RAR for the December 2007 through 2010 tax years, which included proposed adjustments that reflect the carryover effect of the three protested issues from 2006 through October 2007. These proposed adjustments are also being protested in appeals, and formal appeals protests have been submitted. In April 2016, we requested a Technical Advice Memorandum ("TAM") from the IRS with respect to the treatment of the foreign currency gains and losses on loans issued by our Luxembourg subsidiary. We received a taxpayer favorable TAM in October 2018, and this issue is no longer being pursued by IRS Appeals for any of the open tax years. In September 2018, we received a 30-day Letter from the IRS and the RAR for the 2011 through 2013 tax years, which reflects proposed adjustments for the carryover effect of the two remaining protested issues from 2006 through October 2007. The adjustments for tax years 2011 through 2013 will also be protested in appeals, and formal protests have been submitted. After receipt of the TAM relating to the Luxembourg subsidiary, in total, the two remaining proposed adjustments sought by the IRS for the tax years with open audits would result in additional U.S. federal tax owed of approximately $817 million , excluding interest and penalties and potential state income taxes. The portion of this amount related to Hilton Honors would result in a decrease to our future tax liability when the points are redeemed. We disagree with the IRS's position on each of these assertions and intend to vigorously contest them. However, based on continuing appeals process discussions with the IRS, we believe that it is more likely than not that we will not recognize the full benefit related to certain of the issues being appealed. Accordingly, we have recorded $52 million of unrecognized tax benefits related to these issues. We file income tax returns, including returns for our subsidiaries, with federal, state, local and foreign tax jurisdictions. We are under regular and recurring audit by the IRS and other taxing authorities on open tax positions. The timing of the resolution of tax audits is highly uncertain, as are the amounts, if any, that may ultimately be paid upon such resolution. Changes may result from the conclusion of ongoing audits, appeals or litigation in federal, state, local and foreign tax jurisdictions or from the resolution of various proceedings between the U.S. and foreign tax authorities. We are no longer subject to U.S. federal income tax examination for years through 2004. As of December 31, 2018 , we remain subject to federal examinations from 2005 through 2017, state examinations from 2005 through 2017 and foreign examinations of our income tax returns for the years 1996 through 2017.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Pension and Other Postretirement Benefits Disclosure [Text Block]	Employee Benefit Plans We sponsor multiple domestic and international employee benefit plans. Benefits are based upon years of service and compensation. We have both a noncontributory retirement plan and multiple employee benefit plans (the "pension plans"). The noncontributory retirement plan is in the U.S. (the "Domestic Plan"), and it covers certain employees not earning union benefits. This plan was frozen for participant benefit accruals in 1996; therefore, the projected benefit obligation is equal to the accumulated benefit obligation. The plan assets will be used to pay benefits due to employees for service through December 31, 1996. Since employees have not accrued additional benefits from that time, we do not utilize salary or pension inflation assumptions in calculating our benefit obligation for the Domestic Plan. The annual measurement date for the Domestic Plan is December 31. The multiple employee benefit plans cover many of our international employees. These include: (i) a plan that covers workers in the United Kingdom (the "U.K. Plan"), which was frozen to further service accruals on November 30, 2013 and (ii) a number of smaller plans that cover workers in various countries around the world (the "International Plans"). The annual measurement date for all of these plans is December 31. We are required to recognize the funded status of our pension plans, which is the difference between the fair value of plan assets and the projected benefit obligations, in our consolidated balance sheets and make corresponding adjustments for changes in the value through accumulated other comprehensive income (loss), net of taxes. The following table presents the projected benefit obligation, fair value of plan assets, funded status and accumulated benefit obligation for the Domestic Plan, the U.K. Plan and the International Plans: Domestic Plan U.K. Plan International Plans 2018 2017 2018 2017 2018 2017 (in millions) Change in Projected Benefit Obligation: Benefit obligation at beginning of year $ 384 $ 381 $ 443 $ 404 $ 86 $ 81 Service cost — — 3 2 2 1 Interest cost 12 12 9 10 2 1 Prior service cost (1) — — 4 — — — Actuarial loss (gain) (14 ) 16 (39 ) 4 — 3 Settlements and curtailments (2 ) (1 ) — — (1 ) — Effect of foreign exchange rates — — (25 ) 40 (1 ) 4 Benefits paid (23 ) (24 ) (20 ) (17 ) (5 ) (4 ) Benefit obligation at end of year $ 357 $ 384 $ 375 $ 443 $ 83 $ 86 Change in Plan Assets: Fair value of plan assets at beginning of year $ 306 $ 267 $ 386 $ 336 $ 65 $ 58 Actual return on plan assets, net of expenses (23 ) 43 (14 ) 24 (1 ) 6 Employer contributions 16 21 10 9 4 4 Settlements (2 ) (1 ) — — — — Effect of foreign exchange rates — — (22 ) 34 — 1 Benefits paid (23 ) (24 ) (20 ) (17 ) (5 ) (4 ) Fair value of plan assets at end of year 274 306 340 386 63 65 Funded status at end of year (underfunded) (83 ) (78 ) (35 ) (57 ) (20 ) (21 ) Accumulated benefit obligation $ 357 $ 384 $ 375 $ 443 $ 83 $ 86 ____________ (1) Relates to U.K. pension equalization requirements. Amounts recognized in the consolidated balance sheets consisted of the following: Domestic Plan U.K. Plan International Plans 2018 2017 2018 2017 2018 2017 (in millions) Other non-current assets $ — $ — $ — $ — $ 7 $ 9 Other liabilities (83 ) (78 ) (35 ) (57 ) (27 ) (30 ) Net amount recognized $ (83 ) $ (78 ) $ (35 ) $ (57 ) $ (20 ) $ (21 ) Amounts recognized in accumulated other comprehensive loss consisted of the following: Domestic Plan U.K. Plan International Plans 2018 2017 2016 2018 2017 2016 2018 2017 2016 (in millions) Net actuarial loss (gain) $ 22 $ (15 ) $ — $ (14 ) $ 13 $ 41 $ 3 $ — $ 3 Prior service cost (credit) (4 ) (3 ) (3 ) 4 — — — — — Amortization of net loss (3 ) (3 ) (3 ) (4 ) (4 ) (2 ) (1 ) — (1 ) Net amount recognized $ 15 $ (21 ) $ (6 ) $ (14 ) $ 9 $ 39 $ 2 $ — $ 2 The estimated unrecognized prior service cost and net loss that will be amortized into net periodic pension cost (credit) during the year ended December 31, 2019 are as follows: Domestic Plan U.K. Plan International Plans (in millions) Unrecognized prior service cost (1) $ 3 $ — $ — Unrecognized net loss (1) 3 4 — Amount unrecognized $ 6 $ 4 $ — ____________ (1) Unrecognized prior service cost amounts for the U.K. Plan and International Plans are less than $1 million and unrecognized net loss amounts for the International Plans are less than $1 million. The net periodic pension cost (credit) was as follows: Domestic Plan U.K. Plan International Plans 2018 2017 2016 2018 2017 2016 2018 2017 2016 (in millions) Service cost $ 6 $ 8 $ 8 $ 3 $ 2 $ 2 $ 2 $ 2 $ 3 Interest cost 12 12 13 9 10 12 2 2 2 Expected return on plan assets (19 ) (19 ) (19 ) (21 ) (19 ) (22 ) (3 ) (3 ) (3 ) Amortization of prior service cost 3 3 4 — — — — — — Amortization of net loss 3 3 3 4 4 2 1 — — Net periodic pension cost (credit) $ 5 $ 7 $ 9 $ (5 ) $ (3 ) $ (6 ) $ 2 $ 1 $ 2 The weighted-average assumptions used to determine benefit obligations were as follows: Domestic Plan U.K. Plan International Plans 2018 2017 2018 2017 2018 2017 Discount rate 4.3 % 3.6 % 3.1 % 2.6 % 3.3 % 2.4 % Salary inflation N/A N/A 1.8 1.8 2.2 2.2 Pension inflation N/A N/A 3.0 3.0 1.8 1.8 The weighted-average assumptions used to determine net periodic pension cost (credit) were as follows: Domestic Plan U.K. Plan International Plans 2018 2017 2016 2018 2017 2016 2018 2017 2016 Discount rate 3.6 % 4.0 % 4.2 % 2.6 % 2.8 % 3.9 % 2.9 % 3.0 % 3.5 % Expected return on plan assets 7.0 7.0 7.3 5.5 5.5 6.5 4.6 4.3 5.4 Salary inflation N/A N/A N/A 1.8 1.9 1.7 2.2 2.1 2.1 Pension inflation N/A N/A N/A 3.0 3.1 2.8 1.8 1.7 1.6 The investment objectives for the various plans are preservation of capital, current income and long-term growth of capital. All plan assets are managed by outside investment managers and do not include investments in Hilton stock. Asset allocations are reviewed periodically by the investment managers. Expected long-term returns on plan assets are determined using historical performance for debt and equity securities held by our plans, actual performance of plan assets and current and expected market conditions. Expected returns are formulated based on the target asset allocation. The target asset allocation for the Domestic Plan, as a percentage of total plan assets, as of December 31, 2018 and 2017 , was 80 percent in funds that invest in equity securities and 20 percent in funds that invest in debt securities. The target asset allocation for the U.K. Plan and the International Plans, as a percentage of total plan assets, as of December 31, 2018 and 2017 , was 75 percent in funds that invest in equity and debt securities and 25 percent in bond funds. The following tables present the fair value hierarchy of total plan assets measured at fair value by asset category: December 31, 2018 Domestic Plan U.K. Plan International Plans (in millions) Level 1 Cash and cash equivalents $ — $ 34 $ 11 Equity funds — 33 2 Bond funds — 39 — Alternative investments — 140 — Level 2 Equity funds — — 4 Bond funds — — 6 Net asset value (1) Bond funds — 44 — Common collective trusts 274 — 40 Other — 50 — $ 274 $ 340 $ 63 December 31, 2017 Domestic Plan U.K. Plan International Plans (in millions) Level 1 Cash and cash equivalents $ — $ — $ 11 Level 2 Equity funds — — 6 Bond funds — — 5 Net asset value (1) Common collective trusts 306 386 43 $ 306 $ 386 $ 65 ____________ (1) Certain investments are measured at net asset value per share as a practical expedient and, therefore, have not been classified in the fair value hierarchy. We expect to contribute approximately $8 million , $9 million and $4 million to the Domestic Plan, the U.K. Plan and the International Plans, respectively, in 2019 . As of December 31, 2018 , the benefits expected to be paid in the next five years and in the aggregate for the five years thereafter were as follows: Domestic Plan U.K. Plan International Plans Year (in millions) 2019 $ 35 $ 19 $ 11 2020 27 19 6 2021 27 20 5 2022 26 20 5 2023 26 20 5 2024-2028 121 107 24 $ 262 $ 205 $ 56 In January 2007, the Domestic Plan and plans maintained for certain domestic hotels currently or formerly managed by us were merged into a multiple employer plan. As of December 31, 2018 and 2017 , the multiple employer plan had combined plan assets of $297 million and $331 million , respectively, and a projected benefit obligation of $380 million and $409 million , respectively. We have various employee defined contribution investment plans whereby we contribute matching percentages of employee contributions. The aggregate expense under these plans totaled $16 million , $15 million and $17 million for the years ended December 31, 2018 , 2017 and 2016 , respectively.

Share-Based Compensation

Share-Based Compensation	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	Share-Based Compensation We grant time-vesting restricted stock units and restricted stock (collectively, "RSUs"), nonqualified stock options ("options") and performance-vesting RSUs ("performance shares") to our employees and deferred share units ("DSUs") to members of our board of directors. We recognized share-based compensation expense of $47 million and $40 million during the three months ended June 30, 2019 and 2018 , respectively, and $81 million and $68 million during the six months ended June 30, 2019 and 2018 , respectively. As of June 30, 2019 , unrecognized compensation costs for unvested awards was approximately $190 million , which are expected to be recognized over a weighted-average period of 1.9 years on a straight-line basis. As of June 30, 2019 , there were 14.2 million shares of common stock available for future issuance under the Hilton 2017 Omnibus Incentive Plan, plus any shares subject to awards outstanding under our 2013 Omnibus Incentive Plan, which will become available for issuance under the Hilton 2017 Omnibus Incentive Plan if such outstanding awards expire or are terminated or are canceled or forfeited. RSUs During the six months ended June 30, 2019 , we granted 1.0 million RSUs with a weighted average grant date fair value per share of $83.38 , which generally vest in equal annual installments over two or three years from the date of grant. Options During the six months ended June 30, 2019 , we granted 0.8 million options with a weighted average exercise price per share of $83.11 , which vest over three years from the date of grant in equal annual installments and terminate 10 years from the date of grant or earlier if the individual's service terminates under certain circumstances. The weighted average grant date fair value per share of the options granted during the six months ended June 30, 2019 was $21.08 , which was determined using the Black-Scholes-Merton option-pricing model with the following assumptions: Expected volatility (1) 23.51 % Dividend yield (2) 0.81 % Risk-free rate (3) 2.47 % Expected term (in years) (4) 6.0 ____________ (1) Estimated using historical movement of Hilton's stock price. (2) Estimated based on the quarterly dividend and the three-month average stock price at the date of grant. (3) Based on the yields of U.S. Department of Treasury instruments with similar expected lives. (4) Estimated using the average of the vesting periods and the contractual term of the options. As of June 30, 2019 , 1.6 million options were exercisable. Performance Shares During the six months ended June 30, 2019 , we granted 0.4 million performance shares with a weighted average grant date fair value per share of $83.11 . The performance shares are settled at the end of the three-year performance period with: (i) 50 percent of the awards subject to achievement based on the compound annual growth rate ("CAGR") of the Company's earnings before interest expense, a provision for income taxes and depreciation and amortization ("EBITDA"), adjusted to exclude certain items ("Adjusted EBITDA") , referred to as EBITDA CAGR and (ii) 50 percent of the awards subject to achievement based on the Company's free cash flow ("FCF") per share CAGR , referred to as FCF CAGR. The total number of performance shares that vest related to each performance measure is based on an achievement factor that ranges from a zero percent to 200 percent payout, with 100 percent being the target. As of June 30, 2019 , we determined that the performance conditions for the performance shares are probable of achievement and we recognized compensation expense, for both our outstanding EBITDA CAGR and FCF CAGR performance shares, at the maximum achievement percentage for the 2017 grants, between target and maximum for the 2018 grants and at target for the 2019 grants.	Share-Based Compensation We recognized share-based compensation expense of $127 million , $121 million and $81 million during the years ended December 31, 2018 , 2017 and 2016 , respective ly, which included amounts reimbursed by hotel owners. The total tax benefit recognized related to share-based compensation expense was $42 million , $49 million and $31 million for the years ended December 31, 2018 , 2017 and 2016 , respectively . As of December 31, 2018 and 2017 , we ac cr ued $15 million in accounts payable, accrued expenses and other in our consolidated balance sheets for certain awards settled in cash. As of December 31, 2018 , unrecognized compensation costs for unvested awards was approximately $121 million , which is expected to be recognized over a weighted-average period of 1.7 years on a straight-line basis. As of December 31, 2018 , there were 16.1 million shares of common stock available for future issuance under the Hilton 2017 Omnibus Incentive Plan, plus any shares subject to awards outstanding under our 2013 Omnibus Incentive Plan, which will become available for issuance under our 2017 Omnibus Incentive Plan as a result of such outstanding awards expiring or terminating or being canceled or forfeited. RSUs The following table provides information about our RSU grants for the last three fiscal years: Year Ended December 31, 2018 2017 2016 (in millions, except per share data) Number of shares granted 0.9 1.5 1.2 Weighted average grant date fair value per share $ 79.31 $ 58.80 $ 59.73 Aggregate intrinsic value of shares vested $ 123 $ 78 $ 40 The following table summarizes the activity of our RSUs during the year ended December 31, 2018 : Number of Shares Weighted Average Grant Date Fair Value per Share (in millions) Outstanding as of December 31, 2017 2.8 $ 51.44 Granted 0.9 79.31 Vested (1.5 ) 49.56 Forfeited (0.2 ) 56.09 Outstanding as of December 31, 2018 2.0 64.88 Options The following table provides information about our option grants for the last three fiscal years: Year Ended December 31, 2018 2017 2016 (in millions, except per share data) Number of options granted 0.6 0.7 0.5 Weighted average exercise price per share $ 79.36 $ 58.40 $ 58.83 Weighted average grant date fair value per share $ 23.72 $ 13.96 $ 16.41 The weighted average grant date fair value per share of each of these option grants was determined using the Black-Scholes-Merton option-pricing model with the following assumptions: Year Ended December 31, 2018 2017 2016 Expected volatility (1) 27.91 % 24.00 % 32.00 % Dividend yield (2) 0.74 % 0.92% - 1.03% 1.43 % Risk-free rate (3) 2.73 % 1.93% - 2.03% 1.36 % Expected term (in years) (4) 6.0 6.0 6.0 ____________ (1) Estimated using historical movement of Hilton's stock price. (2) For the year ended December 31, 2018, estimated based on the quarterly dividend and the three-month average stock price at the grant date; for the years ended December 31, 2017 and 2016, estimated based on the expected annualized dividend payment at the grant date. (3) Based on the yields of U.S. Department of Treasury instruments with similar expected lives. (4) Estimated using the average of the vesting periods and the contractual term of the options. The following table summarizes the activity of our options during the year ended December 31, 2018 : Number of Shares Weighted Average Exercise Price per Share (in millions) Outstanding as of December 31, 2017 2.0 $ 51.24 Granted 0.6 79.36 Exercised (0.2 ) 50.15 Outstanding as of December 31, 2018 (1) 2.4 58.50 Exercisable as of December 31, 2018 (2) 1.1 50.07 ____________ (1) The aggregate intrinsic value was $36 million and the weighted average remaining contractual term was 8 years. (2) The aggregate intrinsic value was $25 million and the weighted average remaining contractual term was 7 years. Performance Shares During the years ended December 31, 2018 and 2017, we issued performance shares with 50 percent of the shares subject to achievement based on the Company's EBITDA CAGR and the other 50 percent of the shares subject to achievement based on the Company's FCF CAGR. The performance shares are settled at the end of the three-year performance period. In 2016, we modified the performance shares that were outstanding as of December 31, 2016 , which were based on a measure of the Company’s total shareholder return relative to the total shareholder returns of members of a peer company group and the Company’s EBITDA CAGR, such that, upon completion of the spin-offs, they were converted to RSUs. We recognized $2.3 million , $3.3 million , and $0.3 million of incremental expense related to the modification of these awards during the years ended December 31, 2018 , 2017 and 2016, respectively. We determined that the performance conditions for performance shares issued in 2018 and 2017 are probable of achievement and, as of December 31, 2018 , we recognized compensation expense related to these awards based on the following anticipated achievement percentages: EBITDA CAGR FCF CAGR 2017 performance shares 200 % 200 % 2018 performance shares 150 % 150 % The following table provides information about our performance share grants for the last three fiscal years: Year Ended December 31, 2018 2017 2016 (in millions, except per share data) EBITDA CAGR: Number of shares granted 0.2 0.2 0.3 Weighted average grant date fair value per share $ 79.36 $ 58.40 $ 58.83 Aggregate intrinsic value of shares vested $ — $ — $ 12 FCF CAGR: Number of shares granted 0.2 0.2 N/A Weighted average grant date fair value per share $ 79.36 $ 58.40 N/A Aggregate intrinsic value of shares vested $ — $ — N/A Relative Shareholder Return: Number of shares granted N/A N/A 0.3 Weighted average grant date fair value per share N/A N/A $ 62.43 Aggregate intrinsic value of shares vested N/A N/A $ 16 The following table summarizes the activity of our performance shares during the year ended December 31, 2018 : EBITDA CAGR FCF CAGR Number of Shares Weighted Average Grant Date Fair Value per Share Number of Shares Weighted Average Grant Date Fair Value per Share (in millions) (in millions) Outstanding as of December 31, 2017 0.2 $ 58.41 0.2 $ 58.41 Granted 0.2 79.36 0.2 79.36 Outstanding as of December 31, 2018 0.4 69.53 0.4 69.53

Earnings per Share

Earnings per Share	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following table presents the calculation of basic and diluted earnings per share ("EPS"): Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 (in millions, except per share amounts) Basic EPS: Numerator: Net income attributable to Hilton stockholders $ 260 $ 217 $ 418 $ 378 Denominator: Weighted average shares outstanding 290 301 291 308 Basic EPS $ 0.90 $ 0.72 $ 1.43 $ 1.22 Diluted EPS: Numerator: Net income attributable to Hilton stockholders $ 260 $ 217 $ 418 $ 378 Denominator: Weighted average shares outstanding 292 303 294 311 Diluted EPS $ 0.89 $ 0.71 $ 1.42 $ 1.21 Less than 1 million share-based compensation awards were excluded from the computation of diluted EPS for the three and six months ended June 30, 2019 and 2018 because their effect would have been anti-dilutive under the treasury stock method.	Earnings (Loss) Per Share The following table presents the calculation of basic and diluted earnings (loss) per share ("EPS"). Year Ended December 31, 2018 2017 2016 (in millions, except per share amounts) Basic EPS: Numerator: Net income (loss) from continuing operations attributable to Hilton stockholders $ 764 $ 1,084 $ (27 ) Denominator: Weighted average shares outstanding 302 324 329 Basic EPS $ 2.53 $ 3.34 $ (0.08 ) Diluted EPS: Numerator: Net income (loss) from continuing operations attributable to Hilton stockholders $ 764 $ 1,084 $ (27 ) Denominator: Weighted average shares outstanding 305 327 329 Diluted EPS $ 2.50 $ 3.32 $ (0.08 ) Approximately 1 million , 1 million and 2 million share-based compensation awards were excluded from the weighted average shares outstanding used in the computation of diluted EPS for the years ended December 31, 2018 , 2017 and 2016

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Equity [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	Stockholders' Equity (Deficit) and Accumulated Other Comprehensive Loss The following tables present the changes in the components of stockholders' equity (deficit) for the three and six months ended June 30, 2019 and 2018 : Three Months Ended June 30, 2019 Equity (Deficit) Attributable to Hilton Stockholders Treasury Stock Additional Accumulated Deficit Accumulated Other Comprehensive Loss Common Stock Noncontrolling Shares Amount Total (in millions) Balance as of March 31, 2019 292 $ 3 $ (2,921 ) $ 10,374 $ (6,558 ) $ (798 ) $ 8 $ 108 Net income — — — — 260 — 1 261 Other comprehensive loss — — — — — (8 ) — (8 ) Dividends — — — — (44 ) — — (44 ) Repurchases of common stock (4 ) — (383 ) — — — — (383 ) Share-based compensation — — — 45 — — — 45 Deconsolidation of a VIE — — — — — — (2 ) (2 ) Balance as of June 30, 2019 288 $ 3 $ (3,304 ) $ 10,419 $ (6,342 ) $ (806 ) $ 7 $ (23 ) Three Months Ended June 30, 2018 Equity (Deficit) Attributable to Hilton Stockholders Treasury Stock Additional Accumulated Deficit Accumulated Other Comprehensive Loss Common Stock Noncontrolling Interests Shares Amount Total (in millions) Balance as of March 31, 2018 317 $ 3 $ (1,001 ) $ 10,288 $ (6,868 ) $ (680 ) $ 5 $ 1,747 Net income — — — — 217 — — 217 Other comprehensive loss — — — — — (62 ) — (62 ) Dividends — — — — (46 ) — — (46 ) Repurchases of common stock (19 ) — (1,329 ) — — — — (1,329 ) Share-based compensation — — — 33 — — — 33 Balance as of June 30, 2018 298 $ 3 $ (2,330 ) $ 10,321 $ (6,697 ) $ (742 ) $ 5 $ 560 Six Months Ended June 30, 2019 Equity (Deficit) Attributable to Hilton Stockholders Treasury Stock Additional Accumulated Deficit Accumulated Other Comprehensive Loss Common Stock Noncontrolling Shares Amount Total (in millions) Balance as of December 31, 2018 295 $ 3 $ (2,625 ) $ 10,372 $ (6,417 ) $ (782 ) $ 7 $ 558 Net income — — — — 418 — 2 420 Other comprehensive loss — — — — — (24 ) — (24 ) Dividends — — — — (87 ) — — (87 ) Repurchases of common stock (8 ) — (679 ) — — — — (679 ) Share-based compensation 1 — — 47 — — — 47 Cumulative effect of the adoption of ASU 2016-02 — — — — (256 ) — — (256 ) Deconsolidation of a VIE — — — — — — (2 ) (2 ) Balance as of June 30, 2019 288 $ 3 $ (3,304 ) $ 10,419 $ (6,342 ) $ (806 ) $ 7 $ (23 ) Six Months Ended June 30, 2018 Equity (Deficit) Attributable to Hilton Stockholders Treasury Stock Additional Accumulated Deficit Accumulated Other Comprehensive Loss Common Stock Noncontrolling Interests Shares Amount Total (in millions) Balance as of December 31, 2017 317 $ 3 $ (891 ) $ 10,298 $ (6,981 ) $ (741 ) $ 3 $ 1,691 Net income — — — — 378 — 2 380 Other comprehensive loss — — — — — (1 ) — (1 ) Dividends — — — — (94 ) — — (94 ) Repurchases of common stock (20 ) — (1,439 ) — — — — (1,439 ) Share-based compensation 1 — — 23 — — — 23 Balance as of June 30, 2018 298 $ 3 $ (2,330 ) $ 10,321 $ (6,697 ) $ (742 ) $ 5 $ 560 The changes in the components of accumulated other comprehensive loss, net of taxes, were as follows: Currency Translation Adjustment (1) Pension Liability Adjustment Cash Flow Hedge Adjustment Total (in millions) Balance as of December 31, 2018 $ (545 ) $ (260 ) $ 23 $ (782 ) Other comprehensive income (loss) before reclassifications 11 — (35 ) (24 ) Amounts reclassified from accumulated other comprehensive loss 1 4 (5 ) — Net current period other comprehensive income (loss) 12 4 (40 ) (24 ) Balance as of June 30, 2019 $ (533 ) $ (256 ) $ (17 ) $ (806 ) Currency Translation Adjustment (1) Pension Liability Adjustment Cash Flow Hedge Adjustment Total (in millions) Balance as of December 31, 2017 $ (513 ) $ (229 ) $ 1 $ (741 ) Other comprehensive income (loss) before reclassifications (45 ) — 36 (9 ) Amounts reclassified from accumulated other comprehensive loss — 3 5 8 Net current period other comprehensive income (loss) (45 ) 3 41 (1 ) Balance as of June 30, 2018 $ (558 ) $ (226 ) $ 42 $ (742 ) ____________ (1) Includes net investment hedges and intra-entity foreign currency transactions that are of a long-term investment nature. The following table presents additional information about reclassifications out of accumulated other comprehensive loss; amounts in parentheses indicate a loss in our condensed consolidated statements of operations: Three Months Ended Six Months Ended June 30, 2019 June 30, 2019 (in millions) Currency translation adjustment: Liquidation of investment in a foreign entity (1) $ (1 ) $ (1 ) Total currency translation adjustment reclassifications for the period, net of taxes (1 ) (1 ) Pension liability adjustment: Amortization of prior service cost (3) (1 ) (2 ) Amortization of net loss (3) (1 ) (3 ) Tax benefit (2) — 1 Total pension liability adjustment reclassifications for the period, net of taxes (2 ) (4 ) Cash flow hedge adjustment: Dedesignated interest rate swaps (4) 3 6 Tax expense (2) — (1 ) Total cash flow hedge adjustment reclassifications for the period, net of taxes 3 5 Total reclassifications for the period, net of taxes $ — $ — ____________ (1) Includes a gain on the related net investment hedge. Reclassified to loss on foreign currency transactions in our condensed consolidated statements of operations. The related tax benefit reclassified to income tax expense in our condensed consolidated statements of operations was less than $1 million . (2) Reclassified to income tax expense in our condensed consolidated statements of operations. (3) Reclassified to other non-operating income (loss), net in our condensed consolidated statements of operations. (4) Reclassified to interest expense in our condensed consolidated statements of operations. As of June 30, 2019 , approximately $1.4 billion remained available for share repurchases under our $3.5 billion stock repurchase program.
Comprehensive Income (Loss) Note [Text Block]		Accumulated Other Comprehensive Loss The components of accumulated other comprehensive loss, net of taxes, were as follows: Currency Translation Adjustment (1) Pension Liability Adjustment Cash Flow Hedge Adjustment Total (in millions) Balance as of December 31, 2015 $ (580 ) $ (194 ) $ (10 ) $ (784 ) Other comprehensive loss before reclassifications (157 ) (63 ) (9 ) (229 ) Amounts reclassified from accumulated other comprehensive loss (1 ) 6 7 12 Net current period other comprehensive loss (158 ) (57 ) (2 ) (217 ) Balance as of December 31, 2016 (738 ) (251 ) (12 ) (1,001 ) Other comprehensive income (loss) before reclassifications 161 15 (4 ) 172 Amounts reclassified from accumulated other comprehensive loss 1 7 17 25 Net current period other comprehensive income 162 22 13 197 Spin-offs of Park and HGV 63 — — 63 Balance as of December 31, 2017 (513 ) (229 ) 1 (741 ) Other comprehensive income (loss) before reclassifications (70 ) (18 ) 17 (71 ) Amounts reclassified from accumulated other comprehensive loss — 9 5 14 Net current period other comprehensive income (loss) (70 ) (9 ) 22 (57 ) Cumulative effect of the adoption of ASU 2018-02 38 (22 ) — 16 Balance as of December 31, 2018 $ (545 ) $ (260 ) $ 23 $ (782 ) ____________ (1) Includes net investment hedges and intra-entity foreign currency transactions that are of a long-term investment nature. The following table presents additional information about reclassifications out of accumulated other comprehensive loss (amounts in parentheses indicate a loss in our consolidated statements of operations): Year Ended December 31, 2018 2017 2016 (in millions) Currency translation adjustment: Sale or liquidation of investment in foreign entity (1) $ — $ (2 ) $ — Gains on net investment hedges (1) — 1 1 Total currency translation adjustment reclassifications for the period, net of taxes — (1 ) 1 Pension liability adjustment: Amortization of prior service cost (2) (3 ) (3 ) (4 ) Amortization of net loss (2) (8 ) (7 ) (5 ) Tax benefit (3) 2 3 3 Total pension liability adjustment reclassifications for the period, net of taxes (9 ) (7 ) (6 ) Cash flow hedge adjustment: Dedesignated interest rate swaps (4) (6 ) (26 ) (12 ) Tax benefit (3) 1 9 5 Total cash flow hedge adjustment reclassifications for the period, net of taxes (5 ) (17 ) (7 ) Total reclassifications for the period, net of taxes $ (14 ) $ (25 ) $ (12 ) ____________ (1) Reclassified out of accumulated other comprehensive loss to gain (loss) on foreign currency transactions in our consolidated statements of operations. The related tax benefits for the years ended December 31, 2017 and 2016 were less than $1 million and were reclassified out of accumulated other comprehensive loss to income tax benefit (expense) in our consolidated statements of operations. (2) Reclassified out of accumulated other comprehensive loss to other non-operating income, net in our consolidated statements of operations. These amounts were included in the computation of net periodic pension cost (credit). See Note 15 : " Employee Benefit Plans " for additional information. (3) Reclassified out of accumulated other comprehensive loss to income tax benefit (expense) in our consolidated statements of operations. (4) Reclassified out of accumulated other comprehensive loss to interest expense in our consolidated statements of operations. See Note 11 : " Derivative Instruments and Hedging Activities " for additional information.

Business Segments

Business Segments	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Segment Reporting [Abstract]
Business Segments	Business Segments We are a hospitality company with operations organized in two distinct operating segments: (i) management and franchise and (ii) ownership. These segments are managed and reported separately because of their distinct economic characteristics. The management and franchise segment includes all of the hotels we manage for third-party owners, as well as all franchised hotels operated or managed by someone other than us. As of June 30, 2019 , this segment included 691 managed hotels and 5,059 franchised hotels consisting of 909,453 total rooms. This segment also earns licensing fees from Hilton Grand Vacations and co-brand credit card arrangements for the exclusive right to use certain Hilton marks and IP, as well as fees for managing properties in our ownership segment. As of June 30, 2019 , the ownership segment included 67 properties totaling 20,928 rooms, comprising 59 hotels that we wholly owned or leased, one hotel owned by a consolidated non-wholly owned entity, two hotels leased by consolidated VIEs and five hotels owned or leased by unconsolidated affiliates. The performance of our operating segments is evaluated primarily on operating income, without allocating other revenues and expenses or general and administrative expenses. The following table presents revenues for our reportable segments, reconciled to consolidated amounts: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 (in millions) Franchise and licensing fees $ 445 $ 405 $ 830 $ 738 Base and other management fees (1) 106 101 198 191 Incentive management fees 58 59 113 114 Management and franchise 609 565 1,141 1,043 Ownership 387 392 699 726 Segment revenues 996 957 1,840 1,769 Amortization of contract acquisition costs (7 ) (7 ) (14 ) (14 ) Other revenues 26 22 52 45 Direct reimbursements from managed and franchised properties (2) 789 730 1,564 1,429 Indirect reimbursements from managed and franchised properties (2) 691 600 1,265 1,155 Intersegment fees elimination (1) (11 ) (11 ) (19 ) (19 ) Total revenues $ 2,484 $ 2,291 $ 4,688 $ 4,365 ____________ (1) Includes management, royalty and IP fees charged to our ownership segment by our management and franchise segment, which were eliminated in our condensed consolidated statements of operations. (2) Included in other revenues from managed and franchised properties in our condensed consolidated statements of operations. The following table presents operating income for our reportable segments, reconciled to consolidated income before income taxes: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 (in millions) Management and franchise (1) $ 609 $ 565 $ 1,141 $ 1,043 Ownership (1) 42 29 48 35 Segment operating income 651 594 1,189 1,078 Amortization of contract acquisition costs (7 ) (7 ) (14 ) (14 ) Other revenues, less other expenses 11 10 17 19 Net other revenues (expenses) from managed and franchised properties 22 3 (12 ) (18 ) Depreciation and amortization (86 ) (79 ) (170 ) (161 ) General and administrative (113 ) (115 ) (220 ) (219 ) Operating income 478 406 790 685 Interest expense (101 ) (95 ) (199 ) (178 ) Loss on foreign currency transactions (3 ) (12 ) (3 ) (1 ) Other non-operating income (loss), net (12 ) (1 ) (8 ) 13 Income before income taxes $ 362 $ 298 $ 580 $ 519 ____________ (1) Includes management, royalty and IP fees charged to our ownership segment by our management and franchise segment, which were eliminated in our condensed consolidated statements of operations. The following table presents total assets for our reportable segments, reconciled to consolidated amounts: June 30, December 31, 2019 2018 (in millions) Management and franchise $ 11,399 $ 11,362 Ownership 1,731 927 Corporate and other 2,010 1,706 $ 15,140 $ 13,995 The following table presents capital expenditures for property and equipment for our reportable segments, reconciled to consolidated amounts: Six Months Ended June 30, 2019 2018 (in millions) Ownership $ 25 $ 19 Corporate and other 21 9 $ 46 $ 28	Business Segments We are a hospitality company with operations organized in two distinct operating segments: (i) management and franchise and (ii) ownership. These segments are managed and reported separately because of their distinct economic characteristics. The management and franchise segment includes all of the hotels we manage for third-party owners, as well as all franchised hotels operated or managed by someone other than us. As of December 31, 2018 , this segment included 689 managed hotels and 4,874 franchised hotels consisting of 882,873 total rooms. This segment also earns licensing fees from HGV and co-brand credit card arrangements, as well as fees for managing properties in our ownership segment. As of December 31, 2018 , the ownership segment included 71 properties totaling 21,720 rooms, comprising 62 hotels that we wholly owned or leased, one hotel owned by a consolidated non-wholly owned entity, two hotels leased by consolidated VIEs and six hotels owned or leased by unconsolidated affiliates. The performance of our operating segments is evaluated primarily on operating income, without allocating other revenues and expenses or general and administrative expenses. The following table presents revenues for our reportable segments, reconciled to consolidated amounts: Year Ended December 31, 2018 2017 2016 (in millions) Franchise and licensing fees $ 1,537 $ 1,326 $ 1,095 Base and other management fees(1) 385 379 284 Incentive management fees 235 222 142 Management and franchise 2,157 1,927 1,521 Ownership 1,484 1,432 1,434 Segment revenues 3,641 3,359 2,955 Amortization of contract acquisition costs (27 ) (17 ) (16 ) Other revenues 98 105 82 Direct reimbursements from managed and franchised properties (2) 2,881 2,572 1,644 Indirect reimbursements from managed and franchised properties (2) 2,357 2,155 1,953 Intersegment fees elimination (1) (44 ) (43 ) (42 ) Total revenues $ 8,906 $ 8,131 $ 6,576 ____________ (1) Includes management, royalty and IP fees charged to our ownership segment by our management and franchise segment, which were eliminated in our consolidated statements of operations. (2) Included in other revenues from managed and franchised properties in our consolidated statements of operations. The following table presents operating income for our reportable segments, reconciled to consolidated income from continuing operations before income taxes: Year Ended December 31, 2018 2017 2016 (in millions) Management and franchise (1) $ 2,157 $ 1,927 $ 1,521 Ownership (1) 108 120 113 Segment operating income 2,265 2,047 1,634 Amortization of contract acquisition costs (27 ) (17 ) (16 ) Other revenues, less other expenses 47 49 16 Net other expenses from managed and franchised properties (85 ) (172 ) (12 ) Depreciation and amortization (325 ) (336 ) (353 ) General and administrative (443 ) (439 ) (409 ) Gain on sales of assets, net — — 8 Operating income 1,432 1,132 868 Interest expense (371 ) (351 ) (334 ) Gain (loss) on foreign currency transactions (11 ) 3 (16 ) Loss on debt extinguishment — (60 ) — Other non-operating income, net 28 29 22 Income from continuing operations before income taxes $ 1,078 $ 753 $ 540 ____________ (1) Includes management, royalty and IP fees charged to our ownership segment by our management and franchise segment, which were eliminated in our consolidated statements of operations. The following table presents total assets for our reportable segments, reconciled to consolidated amounts: December 31, 2018 2017 (in millions) Management and franchise $ 11,362 $ 11,505 Ownership 927 964 Corporate and other 1,706 1,759 $ 13,995 $ 14,228 The following table presents capital expenditures for property and equipment for our reportable segments, reconciled to consolidated capital expenditures of continuing operations: Year Ended December 31, 2018 2017 2016 (in millions) Ownership $ 42 $ 32 $ 45 Corporate and other 30 26 17 $ 72 $ 58 $ 62 Total revenues by country were as follows: Year Ended December 31, 2018 2017 2016 (in millions) U.S. $ 6,848 $ 6,046 $ 4,524 United Kingdom 545 544 942 All other 1,513 1,541 1,110 $ 8,906 $ 8,131 $ 6,576 Other than the countries included above, there were no countries that individually represented more than 10 percent of total revenues for the years ended December 31, 2018 , 2017 and 2016 . Property and equipment, net by country was as follows: December 31, 2018 2017 (in millions) U.S. $ 109 $ 105 Japan 106 94 United Kingdom 75 82 Germany 40 36 All other 37 36 $ 367 $ 353 Other than the countries included above, there were no countries that individually represented more than 10 percent of total property and equipment, net as of December 31, 2018 and 2017 .

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies We provide performance guarantees to certain owners of hotels that we operate under management contracts. Most of these guarantees allow us to terminate the contract, rather than fund shortfalls, if specified operating performance levels are not achieved. However, in limited cases, we are obligated to fund performance shortfalls. As of June 30, 2019 , we had six performance guarantees, with expirations ranging from December 2019 to 2039 , and possible cash outlays totaling approximately $39 million . Our obligations under these guarantees in future periods are dependent on the operating performance level of the related hotel over the remaining term of the performance guarantee. As of June 30, 2019 and December 31, 2018 , we accrued current liabilities of $7 million and $12 million , respectively, for one performance guarantee related to a hotel owned by a VIE for which we were not the primary beneficiary. We may enter into new contracts containing performance guarantees in the future, which could increase our possible cash outlays. As of June 30, 2019 , we had a $20 million guarantee for debt of a hotel that we franchise, which has an initial maturity date of February 2022 with two one-year extension options . Although we believe it is unlikely that material payments will be required under this guarantee, there can be no assurance that this will be the case. We do not have any letters of credit pledged as collateral against this guarantee or our performance guarantees. We hold interests in VIEs, for which we are not the primary beneficiary, that have entered into loan agreements with third parties. Under the terms of our contractual arrangements with certain of these VIEs, we may provide financial support to such entities under specified circumstances, including default of such a VIE under a third-party loan agreement, and may have the option to acquire a controlling financial interest in such an entity at a predetermined amount. In a circumstance that we provide financial support or exercise our option to acquire an additional interest in a VIE, we may be required to reassess whether we are the primary beneficiary of the VIE. If we determine that we are the primary beneficiary of the VIE, we would be required to consolidate the total assets, liabilities and results of operations of the VIE, which may be material upon consolidation. We have entered into agreements with owners of certain hotels that we currently manage or will franchise to finance capital expenditures at the hotels for approximately $29 million . As of June 30, 2019 , we expect to fund $19 million of these commitments in the remainder of 2019 and $10 million in 2020. We receive fees from managed and franchised properties to operate our marketing, sales and brand programs on behalf of hotel owners. As of June 30, 2019 and December 31, 2018 , we had collected an aggregate of $392 million and $375 million in excess of amounts expended, respectively, across all programs. We are involved in various claims and lawsuits arising in the ordinary course of business, some of which include claims for substantial sums. While the ultimate results of claims and litigation cannot be predicted with certainty, we expect that the ultimate resolution of all pending or threatened claims and litigation as of June 30, 2019	Commitments and Contingencies We provide performance guarantees to certain owners of hotels that we operate under management contracts. Most of these guarantees allow us to terminate the contract, rather than fund shortfalls, if specified operating performance levels are not achieved. However, in limited cases, we are obligated to fund performance shortfalls. As of December 31, 2018 , we had five performance guarantees, with expirations ranging from 2019 to 2030 , and possible cash outlays totaling approximately $36 million . Our obligations under these guarantees in future periods are dependent on the operating performance level of the related hotel over the remaining term of the performance guarantee. We do not have any letters of credit pledged as collateral against these guarantees. As of December 31, 2018 and 2017 , we accrued liabilities of $12 million and $21 million , respectively, for our performance guarantees, which were related to one hotel and two hotels, respectively, of VIEs for which we were not the primary beneficiary. We may enter into new contracts containing performance guarantees in the future, which could increase our possible cash outlays. We have entered into agreements with owners of certain hotels that we operate or will operate under a management or franchise contract to finance capital expenditures at the hotels for approximately $29 million . As of December 31, 2018, we had not funded any of these commitments and expect to fund $19 million in 2019 and $10 million in 2020. We receive fees from managed and franchised properties to operate our marketing, sales and brand programs on behalf of hotel owners. As of December 31, 2018 and 2017 , we had collected an aggregate of $375 million and $402 million in excess of amounts expended, respectively, across all programs. We are involved in various claims and lawsuits arising in the ordinary course of business, some of which include claims for substantial sums. While the ultimate results of claims and litigation cannot be predicted with certainty, we expect that the ultimate resolution of all pending or threatened claims and litigation as of December 31, 2018

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Equity Investments We hold equity investments in entities that own or lease properties that we manage. Amounts included in our consolidated balance sheets related to these management contracts as of December 31, 2018 and 2017 primarily included $19 million and $20 million , respectively, of management and franchise contracts, net. Amounts included in our consolidated statements of operations for the years ended December 31, 2018, 2017 and 2016 primarily included: (i) management and franchise fees of $10 million , $10 million and $12 million , respectively; (ii) other revenues from managed and franchised properties of $22 million , $22 million and $21 million , respectively; and (iii) other expenses from managed and franchised properties of $22 million , $22 million and $21 million , respectively. Blackstone Blackstone directly and indirectly owns or controls hotels that we manage or franchise and for which we receive fees in connection with the related management and franchise contracts. Our maximum exposure to loss related to these hotels is limited to the amounts discussed below; therefore, our involvement with these hotels does not expose us to additional variability or risk of loss. Due to sales of the Company's common stock, Blackstone was no longer considered a related party of the Company as of October 1, 2017. Amounts included in our consolidated statements of operations related to these management and franchise contracts, for the period of time Blackstone was considered a related party, for the years ended December 31, 2017 and 2016 primarily included: (i) management and franchise fees of $24 million and $42 million , respectively; (ii) other revenues from managed and franchised properties of $113 million and $144 million , respectively; and (iii) other expenses from managed and franchised properties of $113 million and $144 million , respectively. Additionally, our consolidated statements of cash flows included $11 million of contract acquisition costs related to these management and franchise contracts for the year ended December 31, 2017.

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	Supplemental Disclosures of Cash Flow Information Interest paid during the years ended December 31, 2018 , 2017 and 2016 , was $330 million , $314 million and $478 million , respectively. Income taxes, net of refunds, paid during the years ended December 31, 2018 , 2017 and 2016 were $288 million , $526 million and $677 million , respectively. The following non-cash investing and financing activities were excluded from the consolidated statements of cash flows: • In 2017, we had non-cash financing activities of $25 million in connection with the spin-offs. • In 2016, we transferred $116 million

Condensed Consolidated Guaranto

Condensed Consolidated Guarantor Information	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed Financial Statements [Text Block]	Condensed Consolidating Guarantor Financial Information Hilton Worldwide Finance LLC and Hilton Worldwide Finance Corp. (together, the "HWF Issuers"), which are 100 percent owned by Hilton Worldwide Parent LLC ("HWP"), which is 100 percent owned by the Parent, issued the 2025 Senior Notes and the 2027 Senior Notes. Hilton Domestic Operating Company Inc. ("HOC"), which is 100 percent owned by Hilton Worldwide Finance LLC, assumed the 2024 Senior Notes, issued the 2026 Senior Notes and, in June 2019, issued the 2030 Senior Notes. The 2024 Senior Notes, 2025 Senior Notes, 2026 Senior Notes, 2027 Senior Notes and 2030 Senior Notes are collectively referred to as the Senior Notes. The HWF Issuers and HOC are collectively referred to as the Subsidiary Issuers. The Senior Notes are guaranteed jointly and severally on a senior unsecured basis by HWP, the Parent and certain of the Parent's wholly owned domestic restricted subsidiaries that are themselves not issuers of the applicable series of Senior Notes (together, the "Guarantors''). The indentures that govern the Senior Notes provide that any subsidiary of the Company that provides a guarantee of our senior secured credit facilities will guarantee the Senior Notes. Additionally, the HWF Issuers are guarantors of the 2024 Senior Notes, the 2026 Senior Notes and the 2030 Senior Notes and HOC is a guarantor of the 2025 Senior Notes and the 2027 Senior Notes. As of June 30, 2019 , none of our foreign subsidiaries or U.S. subsidiaries owned by foreign subsidiaries or conducting foreign operations or our non-wholly owned subsidiaries guarantee the Senior Notes (collectively, the "Non-Guarantors"). The guarantees are full and unconditional, subject to certain customary release provisions. The indentures that govern the Senior Notes provide that any Guarantor may be released from its guarantee so long as: (i) the subsidiary is sold or sells all of its assets; (ii) the subsidiary is released from its guaranty under our senior secured credit facilities; (iii) the subsidiary is declared "unrestricted" for covenant purposes; (iv) the subsidiary is merged with or into the applicable Subsidiary Issuers or another Guarantor or the Guarantor liquidates after transferring all of its assets to the applicable Subsidiary Issuers or another Guarantor; or (v) the requirements for legal defeasance or covenant defeasance or to discharge the indenture have been satisfied, in each case in compliance with applicable provisions of the indentures. The following tables present the condensed consolidating financial information as of June 30, 2019 and December 31, 2018 , and for the three and six months ended June 30, 2019 and 2018 , for the Parent, HWF Issuers, HOC, Guarantors and Non-Guarantors. The condensed consolidating financial information presents the financial information for all periods based on the composition of the Guarantors and Non-Guarantors as of June 30, 2019 . June 30, 2019 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) ASSETS Current Assets: Cash and cash equivalents $ — $ — $ 3 $ 23 $ 609 $ — $ 635 Restricted cash and cash equivalents — — 34 16 33 — 83 Accounts receivable, net — — 14 852 324 — 1,190 Intercompany receivables — — — — 40 (40 ) — Prepaid expenses — — 16 48 55 (2 ) 117 Other — 1 1 48 147 (7 ) 190 Total current assets — 1 68 987 1,208 (49 ) 2,215 Intangibles and Other Assets: Investments in subsidiaries 2 4,113 7,850 2 — (11,967 ) — Goodwill — — — 3,824 1,333 — 5,157 Brands — — — 4,405 469 — 4,874 Management and franchise contracts, net — — 1 502 314 — 817 Other intangible assets, net — — — 279 121 — 400 Operating lease right-of-use assets — — 36 10 845 — 891 Property and equipment, net — — 61 67 290 — 418 Deferred income tax assets 4 7 86 — 146 (97 ) 146 Other — 12 31 17 162 — 222 Total intangibles and other assets 6 4,132 8,065 9,106 3,680 (12,064 ) 12,925 TOTAL ASSETS $ 6 $ 4,133 $ 8,133 $ 10,093 $ 4,888 $ (12,113 ) $ 15,140 LIABILITIES AND EQUITY (DEFICIT) Current Liabilities: Accounts payable, accrued expenses and other $ 36 $ 20 $ 201 $ 664 $ 743 $ (7 ) $ 1,657 Current maturities of long-term debt — — 20 — 17 — 37 Current portion of deferred revenues — — 47 241 12 (2 ) 298 Intercompany payables — — 40 — — (40 ) — Current portion of liability for guest loyalty program — — — 788 — — 788 Total current liabilities 36 20 308 1,693 772 (49 ) 2,780 Long-term debt — 4,076 3,473 — 223 — 7,772 Operating lease liabilities — — 43 8 1,015 — 1,066 Deferred revenues — — — 754 68 — 822 Deferred income tax liabilities — — — 958 — (97 ) 861 Liability for guest loyalty program — — — 986 — — 986 Other — 35 196 94 551 — 876 Total liabilities 36 4,131 4,020 4,493 2,629 (146 ) 15,163 Equity (Deficit): Total Hilton stockholders' equity (deficit) (30 ) 2 4,113 5,600 2,252 (11,967 ) (30 ) Noncontrolling interests — — — — 7 — 7 Total equity (deficit) (30 ) 2 4,113 5,600 2,259 (11,967 ) (23 ) TOTAL LIABILITIES AND EQUITY (DEFICIT) $ 6 $ 4,133 $ 8,133 $ 10,093 $ 4,888 $ (12,113 ) $ 15,140 December 31, 2018 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) ASSETS Current Assets: Cash and cash equivalents $ — $ — $ 3 $ 17 $ 383 $ — $ 403 Restricted cash and cash equivalents — — 34 15 32 — 81 Accounts receivable, net — — 10 735 405 — 1,150 Intercompany receivables — — — — 40 (40 ) — Prepaid expenses — — 52 37 80 (9 ) 160 Other — 1 1 36 154 (3 ) 189 Total current assets — 1 100 840 1,094 (52 ) 1,983 Intangibles and Other Assets: Investments in subsidiaries 557 5,131 7,930 557 — (14,175 ) — Goodwill — — — 3,824 1,336 — 5,160 Brands — — — 4,404 465 — 4,869 Management and franchise contracts, net — — — 556 316 — 872 Other intangible assets, net — — — 287 128 — 415 Property and equipment, net — — 27 65 275 — 367 Deferred income tax assets 4 — 94 — 90 (98 ) 90 Other — 23 33 22 161 — 239 Total intangibles and other assets 561 5,154 8,084 9,715 2,771 (14,273 ) 12,012 TOTAL ASSETS $ 561 $ 5,155 $ 8,184 $ 10,555 $ 3,865 $ (14,325 ) $ 13,995 LIABILITIES AND EQUITY Current Liabilities: Accounts payable, accrued expenses and other $ 10 $ 19 $ 229 $ 529 $ 765 $ (3 ) $ 1,549 Current maturities of long-term debt — — — — 16 — 16 Current portion of deferred revenues — — 106 239 14 (9 ) 350 Intercompany payables — — 40 — — (40 ) — Current portion of liability for guest loyalty program — — — 700 — — 700 Total current liabilities 10 19 375 1,468 795 (52 ) 2,615 Long-term debt — 4,573 2,467 — 226 — 7,266 Deferred revenues — — — 762 64 — 826 Deferred income tax liabilities — 6 — 962 28 (98 ) 898 Liability for guest loyalty program — — — 969 — — 969 Other — — 211 93 559 — 863 Total liabilities 10 4,598 3,053 4,254 1,672 (150 ) 13,437 Equity: Total Hilton stockholders' equity 551 557 5,131 6,301 2,186 (14,175 ) 551 Noncontrolling interests — — — — 7 — 7 Total equity 551 557 5,131 6,301 2,193 (14,175 ) 558 TOTAL LIABILITIES AND EQUITY $ 561 $ 5,155 $ 8,184 $ 10,555 $ 3,865 $ (14,325 ) $ 13,995 Three Months Ended June 30, 2019 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Revenues Franchise and licensing fees $ — $ — $ 69 $ 338 $ 41 $ (4 ) $ 444 Base and other management fees — — — 57 32 — 89 Incentive management fees — — — 21 37 — 58 Owned and leased hotels — — — — 387 — 387 Other revenues — — 1 20 5 — 26 — — 70 436 502 (4 ) 1,004 Other revenues from managed and franchised properties — — 81 1,247 152 — 1,480 Total revenues — — 151 1,683 654 (4 ) 2,484 Expenses Owned and leased hotels — — — — 334 — 334 Depreciation and amortization — — 1 63 22 — 86 General and administrative — — 89 — 31 (7 ) 113 Other expenses — — 3 2 7 3 15 — — 93 65 394 (4 ) 548 Other expenses from managed and franchised properties — — 87 1,224 147 — 1,458 Total expenses — — 180 1,289 541 (4 ) 2,006 Operating income (loss) — — (29 ) 394 113 — 478 Interest expense — (52 ) (33 ) — (16 ) — (101 ) Gain (loss) on foreign currency transactions — — (1 ) (9 ) 7 — (3 ) Other non-operating income (loss), net — (9 ) — (5 ) 2 — (12 ) Income (loss) before income taxes and equity in earnings from subsidiaries — (61 ) (63 ) 380 106 — 362 Income tax benefit (expense) — 15 14 (94 ) (36 ) — (101 ) Income (loss) before equity in earnings from subsidiaries — (46 ) (49 ) 286 70 — 261 Equity in earnings from subsidiaries 260 306 355 260 — (1,181 ) — Net income 260 260 306 546 70 (1,181 ) 261 Net income attributable to noncontrolling interests — — — — (1 ) — (1 ) Net income attributable to Hilton stockholders $ 260 $ 260 $ 306 $ 546 $ 69 $ (1,181 ) $ 260 Comprehensive income $ 252 $ 235 $ 308 $ 546 $ 85 $ (1,173 ) $ 253 Comprehensive income attributable to noncontrolling interests — — — — (1 ) — (1 ) Comprehensive income attributable to Hilton stockholders $ 252 $ 235 $ 308 $ 546 $ 84 $ (1,173 ) $ 252 Three Months Ended June 30, 2018 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Revenues Franchise and licensing fees $ — $ — $ 50 $ 322 $ 36 $ (4 ) $ 404 Base and other management fees — — 1 55 28 — 84 Incentive management fees — — — 22 37 — 59 Owned and leased hotels — — — — 392 — 392 Other revenues — — 1 17 3 1 22 — — 52 416 496 (3 ) 961 Other revenues from managed and franchised properties — — 62 1,110 158 — 1,330 Total revenues — — 114 1,526 654 (3 ) 2,291 Expenses Owned and leased hotels — — — — 352 — 352 Depreciation and amortization — — 2 58 19 — 79 General and administrative — — 83 — 32 — 115 Other expenses — — 2 8 6 (4 ) 12 — — 87 66 409 (4 ) 558 Other expenses from managed and franchised properties — — 62 1,114 151 — 1,327 Total expenses — — 149 1,180 560 (4 ) 1,885 Operating income (loss) — — (35 ) 346 94 1 406 Interest expense — (57 ) (31 ) — (9 ) 2 (95 ) Gain (loss) on foreign currency transactions — — 6 (89 ) 71 — (12 ) Other non-operating income (loss), net — (7 ) 1 4 4 (3 ) (1 ) Income (loss) before income taxes and equity in earnings from subsidiaries — (64 ) (59 ) 261 160 — 298 Income tax benefit (expense) — 16 14 (61 ) (50 ) — (81 ) Income (loss) before equity in earnings from subsidiaries — (48 ) (45 ) 200 110 — 217 Equity in earnings from subsidiaries 217 265 310 217 — (1,009 ) — Net income 217 217 265 417 110 (1,009 ) 217 Net income attributable to noncontrolling interests — — — — — — — Net income attributable to Hilton stockholders $ 217 $ 217 $ 265 $ 417 $ 110 $ (1,009 ) $ 217 Comprehensive income $ 155 $ 227 $ 266 $ 416 $ 38 $ (947 ) $ 155 Comprehensive income attributable to noncontrolling interests — — — — — — — Comprehensive income attributable to Hilton stockholders $ 155 $ 227 $ 266 $ 416 $ 38 $ (947 ) $ 155 Six Months Ended June 30, 2019 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Revenues Franchise and licensing fees $ — $ — $ 130 $ 632 $ 73 $ (9 ) $ 826 Base and other management fees — — — 109 60 — 169 Incentive management fees — — — 44 69 — 113 Owned and leased hotels — — — — 699 — 699 Other revenues — — 1 43 8 — 52 — — 131 828 909 (9 ) 1,859 Other revenues from managed and franchised properties — — 156 2,386 287 — 2,829 Total revenues — — 287 3,214 1,196 (9 ) 4,688 Expenses Owned and leased hotels — — — — 632 — 632 Depreciation and amortization — — 3 125 42 — 170 General and administrative — — 171 — 62 (13 ) 220 Other expenses — — 4 10 17 4 35 — — 178 135 753 (9 ) 1,057 Other expenses from managed and franchised properties — — 159 2,402 280 — 2,841 Total expenses — — 337 2,537 1,033 (9 ) 3,898 Operating income (loss) — — (50 ) 677 163 — 790 Interest expense — (103 ) (68 ) — (28 ) — (199 ) Gain (loss) on foreign currency transactions — — 1 (27 ) 23 — (3 ) Other non-operating income (loss), net — (9 ) — (5 ) 6 — (8 ) Income (loss) before income taxes and equity in earnings from subsidiaries — (112 ) (117 ) 645 164 — 580 Income tax benefit (expense) — 27 27 (159 ) (55 ) — (160 ) Income (loss) before equity in earnings from subsidiaries — (85 ) (90 ) 486 109 — 420 Equity in earnings from subsidiaries 418 503 593 418 — (1,932 ) — Net income 418 418 503 904 109 (1,932 ) 420 Net income attributable to noncontrolling interests — — — — (2 ) — (2 ) Net income attributable to Hilton stockholders $ 418 $ 418 $ 503 $ 904 $ 107 $ (1,932 ) $ 418 Comprehensive income $ 394 $ 378 $ 506 $ 904 $ 122 $ (1,908 ) $ 396 Comprehensive income attributable to noncontrolling interests — — — — (2 ) — (2 ) Comprehensive income attributable to Hilton stockholders $ 394 $ 378 $ 506 $ 904 $ 120 $ (1,908 ) $ 394 Six Months Ended June 30, 2018 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Revenues Franchise and licensing fees $ — $ — $ 94 $ 584 $ 65 $ (8 ) $ 735 Base and other management fees — — 1 106 54 — 161 Incentive management fees — — — 43 71 — 114 Owned and leased hotels — — — — 726 — 726 Other revenues — — 3 41 5 (4 ) 45 — — 98 774 921 (12 ) 1,781 Other revenues from managed and franchised properties — — 106 2,180 298 — 2,584 Total revenues — — 204 2,954 1,219 (12 ) 4,365 Expenses Owned and leased hotels — — — — 672 — 672 Depreciation and amortization — — 3 118 40 — 161 General and administrative — — 156 — 67 (4 ) 219 Other expenses — — 4 15 15 (8 ) 26 — — 163 133 794 (12 ) 1,078 Other expenses from managed and franchised properties — — 108 2,198 296 — 2,602 Total expenses — — 271 2,331 1,090 (12 ) 3,680 Operating income (loss) — — (67 ) 623 129 — 685 Interest expense — (118 ) (44 ) — (19 ) 3 (178 ) Gain (loss) on foreign currency transactions — — 3 (81 ) 77 — (1 ) Other non-operating income (loss), net — (7 ) 4 12 7 (3 ) 13 Income (loss) before income taxes and equity in earnings from subsidiaries — (125 ) (104 ) 554 194 — 519 Income tax benefit (expense) — 31 27 (134 ) (63 ) — (139 ) Income (loss) before equity in earnings from subsidiaries — (94 ) (77 ) 420 131 — 380 Equity in earnings from subsidiaries 378 472 549 378 — (1,777 ) — Net income 378 378 472 798 131 (1,777 ) 380 Net income attributable to noncontrolling interests — — — — (2 ) — (2 ) Net income attributable to Hilton stockholders $ 378 $ 378 $ 472 $ 798 $ 129 $ (1,777 ) $ 378 Comprehensive income $ 377 $ 417 $ 473 $ 798 $ 90 $ (1,776 ) $ 379 Comprehensive income attributable to noncontrolling interests — — — — (2 ) — (2 ) Comprehensive income attributable to Hilton stockholders $ 377 $ 417 $ 473 $ 798 $ 88 $ (1,776 ) $ 377 Six Months Ended June 30, 2019 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Operating Activities: Net cash provided by (used in) operating activities $ — $ (85 ) $ — $ 675 $ 75 $ (15 ) $ 650 Investing Activities: Capital expenditures for property and equipment — — (5 ) (3 ) (38 ) — (46 ) Capitalized software costs — — — (44 ) — — (44 ) Other — — — 1 (6 ) — (5 ) Net cash used in investing activities — — (5 ) (46 ) (44 ) — (95 ) Financing Activities: Borrowings — 795 1,000 — — — 1,795 Repayment of debt — (1,295 ) (14 ) — (8 ) — (1,317 ) Debt issuance costs — (13 ) (14 ) — — — (27 ) Intercompany transfers 740 598 (933 ) (622 ) 217 — — Dividends paid (87 ) — — — — — (87 ) Repurchases of common stock (653 ) — — — — — (653 ) Intercompany dividends — — — — (15 ) 15 — Share-based compensation tax withholdings and other — — (34 ) — — — (34 ) Net cash provided by (used in) financing activities — 85 5 (622 ) 194 15 (323 ) Effect of exchange rate changes on cash, restricted cash and cash equivalents — — — — 2 — 2 Net increase in cash, restricted cash and cash equivalents — — — 7 227 — 234 Cash, restricted cash and cash equivalents, beginning of period — — 37 32 415 — 484 Cash, restricted cash and cash equivalents, end of period $ — $ — $ 37 $ 39 $ 642 $ — $ 718 Six Months Ended June 30, 2018 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Operating Activities: Net cash provided by (used in) operating activities $ — $ (102 ) $ (8 ) $ 494 $ 148 $ — $ 532 Investing Activities: Capital expenditures for property and equipment — — (4 ) (1 ) (23 ) — (28 ) Capitalized software costs — — — (38 ) — — (38 ) Other — — — (3 ) (6 ) — (9 ) Net cash used in investing activities — — (4 ) (42 ) (29 ) — (75 ) Financing Activities: Borrowings — 150 1,500 — — — 1,650 Repayment of debt — (660 ) — — (12 ) — (672 ) Debt issuance costs — — (21 ) — — — (21 ) Intercompany transfers 1,531 612 (1,451 ) (450 ) (242 ) — — Dividends paid (92 ) — — — — — (92 ) Repurchases of common stock (1,439 ) — — — — — (1,439 ) Share-based compensation tax withholdings and other — — (42 ) — — — (42 ) Net cash provided by (used in) financing activities — 102 (14 ) (450 ) (254 ) — (616 ) Effect of exchange rate changes on cash, restricted cash and cash equivalents — — — — (6 ) — (6 ) Net increase (decrease) in cash, restricted cash and cash equivalents — — (26 ) 2 (141 ) — (165 ) Cash, restricted cash and cash equivalents, beginning of period — — 63 28 579 — 670 Cash, restricted cash and cash equivalents, end of period $ — $ — $ 37 $ 30 $ 438 $ — $ 505	Condensed Consolidating Guarantor Financial Information In April 2018, Hilton Domestic Operating Company Inc. ("HOC"), which is 100 percent owned by Hilton Worldwide Finance LLC, issued the 2026 Senior Notes. In March 2017, Hilton Worldwide Finance LLC and Hilton Worldwide Finance Corp. (the "HWF Issuers"), entities that are 100 percent owned by Hilton Worldwide Parent LLC ("HWP"), which is 100 percent owned by the Parent, issued the 2025 Senior Notes and 2027 Senior Notes. In September 2016, HOC assumed the 2024 Senior Notes that were issued in August 2016 by escrow issuers. In October 2013, the HWF Issuers issued the 2021 Senior Notes, which were redeemed in full in March 2017. See Note 9 : " Debt " for additional information. The HWF Issuers are guarantors of the 2026 Senior Notes and the 2024 Senior Notes. HOC is a guarantor of the 2025 Senior Notes and the 2027 Senior Notes and was a guarantor of the 2021 Senior Notes prior to their redemption. The 2024 Senior Notes, 2025 Senior Notes, 2026 Senior Notes and 2027 Senior Notes are collectively referred to as the Senior Notes. The HWF Issuers and HOC are collectively referred to as the Subsidiary Issuers. The Senior Notes are guaranteed jointly and severally on a senior unsecured basis by HWP, the Parent and certain of the Parent's 100 percent owned domestic restricted subsidiaries that are themselves not issuers of the applicable series of Senior Notes (together, the "Guarantors''). The indentures that govern the Senior Notes provide that any subsidiary of the Company that provides a guarantee of our senior secured credit facility will guarantee the Senior Notes. As of December 31, 2018 , none of our foreign subsidiaries or U.S. subsidiaries owned by foreign subsidiaries or conducting foreign operations or our non-wholly owned subsidiaries guaranteed the Senior Notes (collectively, the "Non-Guarantors"). The guarantees are full and unconditional, subject to certain customary release provisions. The indentures that govern the Senior Notes provide that any Guarantor may be released from its guarantee so long as: (i) the subsidiary is sold or sells all of its assets; (ii) the subsidiary is released from its guaranty under our senior secured credit facility; (iii) the subsidiary is declared "unrestricted" for covenant purposes; (iv) the subsidiary is merged with or into the applicable Subsidiary Issuers or another Guarantor or the Guarantor liquidates after transferring all of its assets to the applicable Subsidiary Issuers or another Guarantor; or (v) the requirements for legal defeasance or covenant defeasance or to discharge the indenture have been satisfied, in each case in compliance with applicable provisions of the indentures. The following tables present the condensed consolidating financial information as of December 31, 2018 and 2017 and for the years ended December 31, 2018 , 2017 and 2016 , for the Parent, HWF Issuers, HOC, Guarantors and Non-Guarantors. December 31, 2018 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) ASSETS Current Assets: Cash and cash equivalents $ — $ — $ 3 $ 17 $ 383 $ — $ 403 Restricted cash and cash equivalents — — 34 15 32 — 81 Accounts receivable, net — — 10 735 405 — 1,150 Intercompany receivables — — — — 40 (40 ) — Prepaid expenses — — 52 37 80 (9 ) 160 Income taxes receivable — — — 23 — (3 ) 20 Other — 1 1 13 154 — 169 Total current assets — 1 100 840 1,094 (52 ) 1,983 Intangibles and Other Assets: Investments in subsidiaries 557 5,131 7,930 557 — (14,175 ) — Goodwill — — — 3,824 1,336 — 5,160 Brands — — — 4,404 465 — 4,869 Management and franchise contracts, net — — — 556 316 — 872 Other intangible assets, net — — — 287 128 — 415 Property and equipment, net — — 27 65 275 — 367 Deferred income tax assets 4 — 94 — 90 (98 ) 90 Other — 23 33 22 161 — 239 Total intangibles and other assets 561 5,154 8,084 9,715 2,771 (14,273 ) 12,012 TOTAL ASSETS $ 561 $ 5,155 $ 8,184 $ 10,555 $ 3,865 $ (14,325 ) $ 13,995 LIABILITIES AND EQUITY Current Liabilities: Accounts payable, accrued expenses and other $ 10 $ 19 $ 229 $ 529 $ 743 $ — $ 1,530 Current portion of deferred revenues — — 106 239 14 (9 ) 350 Intercompany payables — — 40 — — (40 ) — Current maturities of long-term debt — — — — 16 — 16 Income taxes payable — — — — 22 (3 ) 19 Current portion of liability for guest loyalty program — — — 700 — — 700 Total current liabilities 10 19 375 1,468 795 (52 ) 2,615 Long-term debt — 4,573 2,467 — 226 — 7,266 Deferred revenues — — — 762 64 — 826 Deferred income tax liabilities — 6 — 962 28 (98 ) 898 Liability for guest loyalty program — — — 969 — — 969 Other — — 211 93 559 — 863 Total liabilities 10 4,598 3,053 4,254 1,672 (150 ) 13,437 Equity: Total Hilton stockholders' equity 551 557 5,131 6,301 2,186 (14,175 ) 551 Noncontrolling interests — — — — 7 — 7 Total equity 551 557 5,131 6,301 2,193 (14,175 ) 558 TOTAL LIABILITIES AND EQUITY $ 561 $ 5,155 $ 8,184 $ 10,555 $ 3,865 $ (14,325 ) $ 13,995 December 31, 2017 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) ASSETS Current Assets: Cash and cash equivalents $ — $ — $ 2 $ 18 $ 550 $ — $ 570 Restricted cash and cash equivalents — — 61 10 29 — 100 Accounts receivable, net — — 18 712 275 — 1,005 Intercompany receivables — — — — 40 (40 ) — Prepaid expenses — — 25 24 84 (6 ) 127 Income taxes receivable — — — 60 — (24 ) 36 Other — — 1 13 155 — 169 Total current assets — — 107 837 1,133 (70 ) 2,007 Intangibles and Other Assets: Investments in subsidiaries 1,697 7,067 8,326 1,697 — (18,787 ) — Goodwill — — — 3,824 1,366 — 5,190 Brands — — — 4,405 485 — 4,890 Management and franchise contracts, net — — 2 645 306 — 953 Other intangible assets, net — — 1 283 149 — 433 Property and equipment, net — — 20 67 266 — 353 Deferred income tax assets 6 — 104 — 127 (126 ) 111 Other — 20 32 67 172 — 291 Total intangibles and other assets 1,703 7,087 8,485 10,988 2,871 (18,913 ) 12,221 TOTAL ASSETS $ 1,703 $ 7,087 $ 8,592 $ 11,825 $ 4,004 $ (18,983 ) $ 14,228 LIABILITIES AND EQUITY Current Liabilities: Accounts payable, accrued expenses and other $ 15 $ 20 $ 184 $ 576 $ 624 $ (3 ) $ 1,416 Current portion of deferred revenues — — 90 266 13 (3 ) 366 Intercompany payables — — 40 — — (40 ) — Current maturities of long-term debt — 32 — — 14 — 46 Income taxes payable — — — — 36 (24 ) 12 Current portion of liability for guest loyalty program — — — 622 — — 622 Total current liabilities 15 52 314 1,464 687 (70 ) 2,462 Long-term debt — 5,333 983 — 240 — 6,556 Deferred revenues — — — 770 59 — 829 Deferred income tax liabilities — 5 — 1,052 — (126 ) 931 Liability for guest loyalty program — — — 839 — — 839 Other — — 228 64 628 — 920 Total liabilities 15 5,390 1,525 4,189 1,614 (196 ) 12,537 Equity: Total Hilton stockholders' equity 1,688 1,697 7,067 7,636 2,387 (18,787 ) 1,688 Noncontrolling interests — — — — 3 — 3 Total equity 1,688 1,697 7,067 7,636 2,390 (18,787 ) 1,691 TOTAL LIABILITIES AND EQUITY $ 1,703 $ 7,087 $ 8,592 $ 11,825 $ 4,004 $ (18,983 ) $ 14,228 Year Ended December 31, 2018 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Revenues Franchise and licensing fees $ — $ — $ 227 $ 1,182 $ 139 $ (18 ) $ 1,530 Base and other management fees — — 1 205 115 — 321 Incentive management fees — — — 78 157 — 235 Owned and leased hotels — — — — 1,484 — 1,484 Other revenues — — 6 81 11 — 98 — — 234 1,546 1,906 (18 ) 3,668 Other revenues from managed and franchised properties — — 245 4,376 617 — 5,238 Total revenues — — 479 5,922 2,523 (18 ) 8,906 Expenses Owned and leased hotels — — — — 1,332 — 1,332 Depreciation and amortization — — 6 237 82 — 325 General and administrative — — 323 — 130 (10 ) 443 Other expenses — — 7 22 30 (8 ) 51 — — 336 259 1,574 (18 ) 2,151 Other expenses from managed and franchised properties — — 236 4,466 621 — 5,323 Total expenses — — 572 4,725 2,195 (18 ) 7,474 Operating income (loss) — — (93 ) 1,197 328 — 1,432 Interest expense — (227 ) (106 ) — (38 ) — (371 ) Gain (loss) on foreign currency transactions — — 4 84 (99 ) — (11 ) Other non-operating income (loss), net — (9 ) 3 16 18 — 28 Income (loss) before income taxes and equity in earnings from subsidiaries — (236 ) (192 ) 1,297 209 — 1,078 Income tax benefit (expense) — 57 39 (309 ) (96 ) — (309 ) Income (loss) before equity in earnings from subsidiaries — (179 ) (153 ) 988 113 — 769 Equity in earnings from subsidiaries 764 943 1,096 764 — (3,567 ) — Net income 764 764 943 1,752 113 (3,567 ) 769 Net income attributable to noncontrolling interests — — — — (5 ) — (5 ) Net income attributable to Hilton stockholders $ 764 $ 764 $ 943 $ 1,752 $ 108 $ (3,567 ) $ 764 Comprehensive income $ 707 $ 784 $ 932 $ 1,751 $ 48 $ (3,510 ) $ 712 Comprehensive income attributable to noncontrolling interests — — — — (5 ) — (5 ) Comprehensive income attributable to Hilton stockholders $ 707 $ 784 $ 932 $ 1,751 $ 43 $ (3,510 ) $ 707 Year Ended December 31, 2017 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Revenues Franchise and licensing fees $ — $ — $ 143 $ 1,077 $ 118 $ (17 ) $ 1,321 Base and other management fees — — 1 195 128 — 324 Incentive management fees — — — 76 146 — 222 Owned and leased hotels — — — — 1,432 — 1,432 Other revenues — — 31 70 11 (7 ) 105 — — 175 1,418 1,835 (24 ) 3,404 Other revenues from managed and franchised properties — — 159 3,986 582 — 4,727 Total revenues — — 334 5,404 2,417 (24 ) 8,131 Expenses Owned and leased hotels — — — — 1,269 — 1,269 Depreciation and amortization — — 5 242 89 — 336 General and administrative — — 327 — 118 (6 ) 439 Other expenses — — 17 29 27 (17 ) 56 — — 349 271 1,503 (23 ) 2,100 Other expenses from managed and franchised properties — — 147 4,147 605 — 4,899 Total expenses — — 496 4,418 2,108 (23 ) 6,999 Gain (loss) on sales of assets, net — — — (1 ) 1 — — Operating income (loss) — — (162 ) 985 310 (1 ) 1,132 Interest expense — (244 ) (61 ) — (47 ) 1 (351 ) Gain (loss) on foreign currency transactions — — 10 124 (131 ) — 3 Loss on debt extinguishment — (60 ) — — — — (60 ) Other non-operating income (loss), net — (3 ) 4 7 21 — 29 Income (loss) before income taxes and equity in earnings from subsidiaries — (307 ) (209 ) 1,116 153 — 753 Income tax benefit (expense) (3 ) 122 26 89 102 — 336 Income (loss) before equity in earnings from subsidiaries (3 ) (185 ) (183 ) 1,205 255 — 1,089 Equity in earnings from subsidiaries 1,087 1,272 1,455 1,087 — (4,901 ) — Net income 1,084 1,087 1,272 2,292 255 (4,901 ) 1,089 Net income attributable to noncontrolling interests — — — — (5 ) — (5 ) Net income attributable to Hilton stockholders $ 1,084 $ 1,087 $ 1,272 $ 2,292 $ 250 $ (4,901 ) $ 1,084 Comprehensive income $ 1,281 $ 1,101 $ 1,288 $ 2,295 $ 419 $ (5,098 ) $ 1,286 Comprehensive income attributable to noncontrolling interests — — — — (5 ) — (5 ) Comprehensive income attributable to Hilton stockholders $ 1,281 $ 1,101 $ 1,288 $ 2,295 $ 414 $ (5,098 ) $ 1,281 Year Ended December 31, 2016 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Revenues Franchise and licensing fees $ — $ — $ 21 $ 974 $ 106 $ (10 ) $ 1,091 Base and other management fees — — — 122 108 — 230 Incentive management fees — — — 16 126 — 142 Owned and leased hotels — — — — 1,434 — 1,434 Other revenues — — 10 61 11 — 82 — — 31 1,173 1,785 (10 ) 2,979 Other revenues from managed and franchised properties — — 32 3,053 512 — 3,597 Total revenues — — 63 4,226 2,297 (10 ) 6,576 Expenses Owned and leased hotels — — — — 1,279 — 1,279 Depreciation and amortization — — 1 266 86 — 353 General and administrative — — 90 203 116 — 409 Other expenses — — 1 31 44 (10 ) 66 — — 92 500 1,525 (10 ) 2,107 Other expenses from managed and franchised properties — — 32 3,083 494 — 3,609 Total expenses — — 124 3,583 2,019 (10 ) 5,716 Gain on sales of assets, net — — — — 8 — 8 Operating income (loss) — — (61 ) 643 286 — 868 Interest expense — (261 ) (14 ) (12 ) (47 ) — (334 ) Gain (loss) on foreign currency transactions — — 11 (150 ) 123 — (16 ) Other non-operating income, net — 1 1 7 13 — 22 Income (loss) from continuing operations before income taxes and equity in losses from subsidiaries — (260 ) (63 ) 488 375 — 540 Income tax benefit (expense) 193 100 26 (297 ) (579 ) — (557 ) Income (loss) from continuing operations before equity in losses from subsidiaries 193 (160 ) (37 ) 191 (204 ) — (17 ) Equity in losses from subsidiaries (220 ) (60 ) (23 ) (220 ) — 523 — Loss from continuing operations, net of taxes (27 ) (220 ) (60 ) (29 ) (204 ) 523 (17 ) Income from discontinued operations, net of taxes 365 365 365 426 375 (1,525 ) 371 Net income 338 145 305 397 171 (1,002 ) 354 Net income attributable to noncontrolling interests — — — — (16 ) — (16 ) Net income attributable to Hilton stockholders $ 338 $ 145 $ 305 $ 397 $ 155 $ (1,002 ) $ 338 Comprehensive income $ 121 $ 143 $ 310 $ 326 $ 21 $ (785 ) $ 136 Comprehensive income attributable to noncontrolling interests — — — — (15 ) — (15 ) Comprehensive income attributable to Hilton stockholders $ 121 $ 143 $ 310 $ 326 $ 6 $ (785 ) $ 121 Year Ended December 31, 2018 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Operating Activities: Net cash provided by (used in) operating activities $ — $ (185 ) $ (8 ) $ 1,267 $ 181 $ — $ 1,255 Investing Activities: Capital expenditures for property and equipment — — (9 ) (7 ) (56 ) — (72 ) Payments received on other financing receivables — — — 49 1 — 50 Capitalized software costs — — — (87 ) — — (87 ) Other — — — (6 ) (16 ) — (22 ) Net cash used in investing activities — — (9 ) (51 ) (71 ) — (131 ) Financing Activities: Borrowings — 175 1,500 — 1 — 1,676 Repayment of debt — (985 ) — — (20 ) — (1,005 ) Debt issuance costs — — (21 ) — — — (21 ) Intercompany transfers 1,902 995 (1,444 ) (1,209 ) (244 ) — — Dividends paid (181 ) — — — — — (181 ) Repurchases of common stock (1,721 ) — — — — — (1,721 ) Distributions to noncontrolling interests — — — — (1 ) — (1 ) Tax withholdings on share-based compensation — — (44 ) — — — (44 ) Acquisition of noncontrolling interest — — — (3 ) — — (3 ) Net cash provided by (used in) financing activities — 185 (9 ) (1,212 ) (264 ) — (1,300 ) Effect of exchange rate changes on cash, restricted cash and cash equivalents — — — — (10 ) — (10 ) Net increase (decrease) in cash, restricted cash and cash equivalents — — (26 ) 4 (164 ) — (186 ) Cash, restricted cash and cash equivalents, beginning of period — — 63 28 579 — 670 Cash, restricted cash and cash equivalents, end of period $ — $ — $ 37 $ 32 $ 415 $ — $ 484 Year Ended December 31, 2017 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Operating Activities: Net cash provided by (used in) operating activities $ — $ (113 ) $ (103 ) $ 950 $ 285 $ (170 ) $ 849 Investing Activities: Capital expenditures for property and equipment — — (12 ) (12 ) (34 ) — (58 ) Payments received on other financing receivables — — — 7 — — 7 Capitalized software costs — — — (75 ) — — (75 ) Other — (13 ) — (8 ) 3 (3 ) (21 ) Net cash used in investing activities — (13 ) (12 ) (88 ) (31 ) (3 ) (147 ) Financing Activities: Borrowings — 1,822 — — 2 — 1,824 Repayment of debt — (1,852 ) — — (8 ) — (1,860 ) Debt issuance costs and redemption premium — (69 ) — — — — (69 ) Repayment of intercompany borrowings — — (3 ) — — 3 — Intercompany transfers 1,086 225 122 (865 ) (568 ) — — Dividends paid (195 ) — — — — — (195 ) Intercompany dividends — — — — (170 ) 170 — Cash transferred in spin-offs of Park and HGV — — — — (501 ) — (501 ) Repurchases of common stock (891 ) — — — — — (891 ) Distributions to noncontrolling interests — — — — (1 ) — (1 ) Tax withholdings on share-based compensation — — (31 ) — — — (31 ) Net cash provided by (used in) financing activities — 126 88 (865 ) (1,246 ) 173 (1,724 ) Effect of exchange rate changes on cash, restricted cash and cash equivalents — — — — 8 — 8 Net decrease in cash, restricted cash and cash equivalents — — (27 ) (3 ) (984 ) — (1,014 ) Cash, restricted cash and cash equivalents from continuing operations, beginning of period — — 90 31 1,062 — 1,183 Cash, restricted cash and cash equivalents from discontinued operations, beginning of period — — — — 501 — 501 Cash, restricted cash and cash equivalents, beginning of period — — 90 31 1,563 — 1,684 Cash, restricted cash and cash equivalents, end of period $ — $ — $ 63 $ 28 $ 579 $ — $ 670 Year Ended December 31, 2016 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Operating Activities: Net cash provided by (used in) operating activities $ — $ (37 ) $ — $ 866 $ 1,086 $ (605 ) $ 1,310 Investing Activities: Capital expenditures for property and equipment — — — (9 ) (308 ) — (317 ) Payments received on other financing receivables — — — 2 1 — 3 Issuance of intercompany receivables — — — (192 ) (42 ) 234 — Payments received on intercompany receivables — — — 192 — (192 ) — Capitalized software costs — — — (73 ) (8 ) — (81 ) Other — (6 ) — (37 ) 15 — (28 ) Net cash used in investing activities — (6 ) — (117 ) (342 ) 42 (423 ) Financing Activities: Borrowings — — 1,000 — 3,715 — 4,715 Repayment of debt — (266 ) — — (4,093 ) — (4,359 ) Debt issuance costs — (17 ) (20 ) — (39 ) — (76 ) Intercompany borrowings — — — 42 192 (234 ) — Repayment of intercompany borrowings — — — — (192 ) 192 — Intercompany transfers 277 326 (890 ) (854 ) 1,141 — — Dividends paid (277 ) — — — — — (277 ) Intercompany dividends — — — — (605 ) 605 — Distributions to noncontrolling interests — — — — (32 ) — (32 ) Tax withholdings on share-based compensation — — — (15 ) — — (15 ) Net cash provided by (used in) financing activities — 43 90 (827 ) 87 563 (44 ) Effect of exchange rate changes on cash, restricted cash and cash equivalents — — — — (15 ) — (15 ) Net increase (decrease) in cash, restricted cash and cash equivalents — — 90 (78 ) 816 — 828 Cash, restricted cash and cash equivalents from continuing operations, beginning of period — — — 109 524 — 633 Cash, restricted cash and cash equivalents from discontinued operations, beginning of period — — — — 223 — 223 Cash, restricted cash and cash equivalents, beginning of period — — — 109 747 — 856 Cash, restricted cash and cash equivalents from continuing operations, end of period — — 90 31 1,062 — 1,183 Cash, restricted cash and cash equivalents from discontinued operations, end of period — — — — 501 — 501 Cash, restricted cash and cash equivalents, end of period $ — $ — $ 90 $ 31 $ 1,563 $ — $ 1,684

Selected Quarterly Financial In

Selected Quarterly Financial Information	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Selected Quarterly Financial Information	Selected Quarterly Financial Information The following table sets forth the historical unaudited quarterly financial data for the periods indicated. The information for each of these periods has been prepared on the same basis as the audited consolidated financial statements and, in our opinion, reflects all adjustments necessary to fairly present our financial results. Operating results for previous periods do not necessarily indicate results that may be achieved in any future period. 2018 First Quarter Second Quarter Third Quarter Fourth Quarter Year (in millions, except per share data) Revenues $ 2,074 $ 2,291 $ 2,253 $ 2,288 $ 8,906 Operating income 279 406 385 362 1,432 Net income 163 217 164 225 769 Net income attributable to Hilton stockholders 161 217 162 224 764 Basic earnings per share (1) $ 0.51 $ 0.72 $ 0.55 $ 0.76 $ 2.53 Diluted earnings per share (1) $ 0.51 $ 0.71 $ 0.54 $ 0.75 $ 2.50 2017 First Quarter Second Quarter Third Quarter Fourth Quarter Year (in millions, except per share data) Revenues $ 1,896 $ 2,076 $ 2,091 $ 2,068 $ 8,131 Operating income 217 324 332 259 1,132 Net income 48 151 160 730 1,089 Net income attributable to Hilton stockholders 47 150 158 729 1,084 Basic earnings per share (1) $ 0.14 $ 0.46 $ 0.49 $ 2.29 $ 3.34 Diluted earnings per share (1) $ 0.14 $ 0.46 $ 0.49 $ 2.27 $ 3.32 ____________ (1)

Basis of Presentation and Sum_2

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Lessor, Leases [Policy Text Block]	Leases We determine if a contract is or contains a lease at the inception of the contract, and we classify that lease as a finance lease if it meets certain criteria or as an operating lease when it does not. We reassess if a contract is or contains a leasing arrangement upon modification of the contract. For a contract, in which we are a lessee, that contains fixed payments for both lease and non-lease components, we have elected to account for the components as a single lease component, as permitted. At the commencement date of a lease, we recognize a lease liability for future fixed lease payments and a right-of-use ("ROU") asset representing our right to use the underlying asset during the lease term. The lease liability is initially measured as the present value of the future fixed lease payments that will be made over the lease term. The lease term includes lessee options to extend the lease and periods occurring after a lessee early termination option, only to the extent it is reasonably certain that we will exercise such extension options and not exercise such early termination options, respectively. The future fixed lease payments are discounted using the rate implicit in the lease, if available, or our incremental borrowing rate. Our incremental borrowing rate is estimated on a portfolio basis and incorporates lease term, currency risk, credit risk and an adjustment for collateral. Upon adoption of ASU 2016-02, we elected to use the remaining lease term as of January 1, 2019 in our estimation of the applicable discount rate for leases that were in place at adoption. For the initial measurement of the lease liability for leases commencing after January 1, 2019, we use the discount rate as of the commencement date of the lease, incorporating the entire lease term. Additionally, we elected not to recognize leases with lease terms of 12 months or less at the commencement date in our consolidated balance sheets. Current maturities and long-term portions of operating lease liabilities are classified as accounts payable, accrued expenses and other and operating lease liabilities, respectively, and current maturities and long-term portions of finance lease liabilities are classified as current maturities of long-term debt and long-term debt, respectively, in our consolidated balance sheets. The ROU asset is measured at the amount of the lease liability with adjustments, if applicable, for lease prepayments made prior to or at lease commencement, initial direct costs incurred by us and lease incentives. We evaluate the carrying value of ROU assets if there are indicators of impairment and review the recoverability of the related asset group. If the carrying value of the asset group is determined to not be recoverable and is in excess of the estimated fair value, we record an impairment loss in our consolidated statements of operations. ROU assets of operating leases are classified as operating lease right-of-use assets and ROU assets of finance leases are classified as property and equipment, net in our consolidated balance sheets. Our operating leases require: (i) fixed lease payments, or minimum payments, as contractually stated in the lease agreement; (ii) variable lease payments, which, for our hotels, are generally based on a percentage of the underlying asset's revenues or profits, or are dependent on changes in an index; or (iii) lease payments equal to the greater of the fixed or variable lease payments. In addition, we may be required to pay some, or all, of the capital costs for furniture, equipment and leasehold improvements in a hotel property that we lease during the term of the lease. For operating leases, lease expense relating to fixed payments is recognized on a straight-line basis over the lease term, and lease expense relating to variable payments is expensed as incurred, with amounts recognized in owned and leased hotel expenses, general and administrative expenses and other expenses from managed and franchised properties in our consolidated statements of operations. For finance leases, the amortization of the asset is recognized over the shorter of the lease term or useful life of the underlying asset within depreciation and amortization expense and other expenses from managed and franchised properties in our consolidated statements of operations. The interest expense related to finance leases, including any variable lease payments, is recognized in interest expense in our consolidated statements of operations.
Consolidation, Policy [Policy Text Block]		Principles of Consolidation Our consolidated financial statements include the accounts of our wholly owned subsidiaries and entities in which we have a controlling financial interest, including variable interest entities ("VIEs") for which we are the primary beneficiary. Entities in which we have a controlling financial interest generally comprise majority owned real estate ownership and management enterprises. The determination of a controlling financial interest is based upon the terms of the governing agreements of the respective entities, including the evaluation of rights held by other ownership interests. If the entity is considered to be a VIE, we determine whether we are the primary beneficiary, and then consolidate those VIEs for which we have determined we are the primary beneficiary. If the entity in which we hold an interest does not meet the definition of a VIE, we evaluate whether we have a controlling financial interest through our voting interests in the entity. We consolidate entities when we own more than 50 percent of the voting shares of a company or otherwise have a controlling financial interest. All material intercompany transactions and balances have been eliminated in consolidation. References in these financial statements to net income (loss) attributable to Hilton stockholders and Hilton stockholders' equity (deficit) do not include noncontrolling interests, which represent the outside ownership interests of our consolidated, non-wholly owned entities and are reported separately.
Use of Estimates, Policy [Policy Text Block]		Use of Estimates The preparation of financial statements in conformity with United States ("U.S") generally accepted accounting principles ("GAAP") requires management to make estimates and assumptions that affect the amounts reported and, accordingly, ultimate results could differ from those estimates.
Reclassification, Policy [Policy Text Block]		Reclassifications On January 1, 2018, we adopted the requirements of Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09") using the full retrospective approach as of January 1, 2016. All amounts and disclosures set forth in this prospectus reflect the necessary adjustments required for the adoption of this standard, including the reclassification of prior period balances to conform to current year presentation. See "Summary of Significant Accounting Policies" below for additional information.
Revenue Recognition, Policy [Policy Text Block]		Revenue Recognition Revenues are primarily derived from management and franchise contracts with third-party hotel and resort owners, as well as from our owned and leased hotels. The majority of our performance obligations are a series of distinct goods or services, for which we receive variable consideration through our management and franchise fees or fixed consideration through our owned and leased hotels. We allocate the variable fees to the distinct services to which they relate applying the prescribed variable consideration allocation guidance, and we allocate fixed consideration to the related performance obligations based on their estimated standalone selling prices. We do not adjust the promised amount of consideration for the effects of a significant financing component when we expect, at contract inception, that the period between our transfer of a promised good or service to a customer and when the customer pays for that good or service will be one year or less, which it is in substantially all cases. Additionally, we do not typically include extended payment terms in our contracts with customers. Management and franchise revenues We identified the following performance obligations in connection with our management and franchise contracts: • Intellectual Property ("IP") licenses grant the right to access our hotel system IP, including brand IP, reservations systems and property management systems. • Hotel management services include providing day-to-day management services of the hotels for the property owners. • Development services include providing consultative services (e.g., design assistance and contractor selection) to the property owner to assist with the construction of the hotel prior to the hotel opening. • Pre-opening services include providing services (e.g., advertising, budgeting, e-commerce strategies, food and beverage testing) to the property owner to assist in preparing for the hotel opening. • Substantive rights for free or discounted goods or services to hotel guests are satisfied at the earlier point in time of either when the substantive right expires or the underlying free or discounted good or service is provided to the hotel guest. Each of the identified performance obligations is considered to be a series of distinct services transferred over time. While the underlying activities may vary from day to day, the nature of the commitments are the same each day, and the property owner can independently benefit from each day's services. Management and franchise fees are typically based on the sales or usage of the underlying hotel, with the exception of fixed upfront fees, which usually represent an insignificant portion of the transaction price. Franchise and licensing fees represent fees earned in connection with the licensing of one of our brands, usually under long-term contracts with the property owner, and include the following: • Royalty fees are generally based on a percentage of the hotel's monthly gross room revenue and, in some cases, may also include a percentage of gross food and beverage revenues and other revenues, as applicable. These fees are typically billed and collected monthly, and revenue is generally recognized as services are provided. • Application, initiation and other fees are charged when: (i) new hotels enter our system; (ii) there is a change of ownership of a hotel; or (iii) contracts with properties already in our system are extended. These fees are typically fixed and collected upfront and are recognized as revenue over the term of the franchise contract. We do not consider this advance consideration to include a significant financing component, since it is used to protect us from the property owner failing to adequately complete some or all of its obligations under the contract. • Licensing fees are earned from: (i) a license agreement with HGV to use certain Hilton marks and IP in its timeshare business, which are typically billed and collected monthly, and revenue is generally recognized at the same time the fees are billed and (ii) co-brand credit card arrangements, which are recognized as revenue when points for our guest loyalty program, Hilton Honors, are issued, generally as spend on the co-branded credit card occurs; see further discussion below under "Hilton Honors." Consideration paid or anticipated to be paid to incentivize hotel owners to enter into franchise contracts with us is amortized over the life of the applicable contract as a reduction to franchise and licensing fees. Management fees represent fees earned from hotels that we manage, usually under long-term contracts with the property owner, and include the following: • Base management fees are generally based on a percentage of the hotel's monthly gross revenue. Base fees are typically billed and collected monthly, and revenue is generally recognized as services are provided. • Incentive management fees are generally based on a percentage of the hotel's operating profits and in some cases may be subject to a stated return threshold to the property owner, normally over a one-calendar year period (the "incentive period"). Incentive fee revenue is recognized on a monthly basis, but only to the extent the cumulative fee earned does not exceed the probable fee for the incentive period. Incentive fee payment terms vary, but they are generally billed and collected monthly or annually upon completion of the incentive period. Consideration paid or anticipated to be paid to incentivize hotel owners to enter into management contracts with us is amortized over the life of the applicable contract as a reduction to base and other management fees. We do not estimate revenues expected to be recognized related to our unsatisfied performance obligations for our: (i) royalty fees, since they are considered sales-based royalty fees recognized as hotel room sales occur in exchange for licenses of our brand names over the terms of the franchise contracts and (ii) base management fees and incentive management fees, since they are allocated entirely to the wholly unsatisfied promise to transfer management services, which form part of a single performance obligation in a series, over the term of the individual management contract. Other revenues from managed and franchised properties represent amounts that are contractually reimbursed to us by property owners, either directly as costs are incurred or indirectly through fees that are billed and collected in advance related to certain costs and expenses of the related properties, and include the following: • Direct reimbursements include payroll and related costs and certain other operating costs of the managed and franchised properties' operations, which are contractually reimbursed to us by the property owners as expenses are incurred. Revenue is recognized based on the amount of expenses incurred by Hilton, which are presented as other expenses from managed and franchised properties in our consolidated statements of operations, that are then reimbursed to us by the property owner typically on a monthly basis, which results in no net effect on operating income (loss) or net income (loss). • Indirect reimbursements include marketing expenses and other expenses associated with our brands and shared services, which are paid from fees collected by Hilton from the managed and franchised properties. Indirect reimbursements are typically billed and collected monthly, based on the underlying hotel's sales or usage (such as gross room revenue and number of reservations processed), and revenue is generally recognized as services are provided. System implementation fees charged to property owners are deferred and recognized as revenue over the term of the management or franchise contract. The corresponding expenses are expensed as incurred and are presented as other expenses from managed and franchised properties in our consolidated statements of operations and are expected to equal the revenues earned from indirect reimbursements over time. The management and franchise fees and reimbursements from third-party hotel owners are allocated to the performance obligations and the distinct services to which they relate using their estimated standalone selling prices. The terms of the fees earned under the contract relate to a specific outcome of providing the services (e.g., hotel room sales) or to Hilton's efforts (e.g., costs) to satisfy the performance obligations. Using time as the measure of progress, we recognize fee revenue and indirect reimbursements in the period earned per the terms of the contract and revenue related to direct reimbursements in the period in which the cost is incurred. Owned and leased hotel revenues We identified the following performance obligations in connection with our owned and leased hotel revenues, for which revenue is recognized as the respective performance obligations are satisfied, which results in recognizing the amount we expect to be entitled to for providing the goods or services: • Cancellable room reservations or ancillary services are typically satisfied as the good or service is transferred to the hotel guest, which is generally when the room stay occurs. • Noncancellable room reservations and banquet or conference reservations represent a series of distinct goods or services provided over time and satisfied as each distinct good or service is provided, which is reflected by the duration of the reservation. • Substantive rights for free or discounted goods or services are satisfied at the earlier of when: (i) the substantive right expires or (ii) the underlying free or discounted good or service is provided to the hotel guest. • Other ancillary goods and services are purchased independently of the room reservation at standalone selling prices and are considered separate performance obligations, which are satisfied when the related good or service is provided to the hotel guest. • Components of package reservations for which each component could be sold separately to other hotel guests are considered separate performance obligations and are satisfied as set forth above. Owned and leased hotel revenues primarily consist of hotel room sales, revenue from accommodations sold in conjunction with other services (e.g., package reservations), food and beverage sales and other ancillary goods and services (e.g., parking) related to owned, leased and consolidated non-wholly owned hotel properties. Revenue is recognized when rooms are occupied or goods and services have been delivered or rendered, respectively. Payment terms typically align with when the goods and services are provided. Owned and leased hotel revenues are reduced upon issuance of Hilton Honors points for Hilton Honors members' paid stay transactions and are recognized when Hilton Honors points are redeemed for a free stay at an owned or leased hotel (see the "Hilton Honors" section below for additional information). Although the transaction prices of hotel room sales, goods and other services are generally fixed and based on the respective room reservation or other agreement, an estimate to reduce the transaction price is required if a discount is expected to be provided to the customer. For package reservations, the transaction price is allocated to the performance obligations within the package based on the estimated standalone selling prices of each component. On occasion, the hotel may also provide the customer with a substantive right to a free or discounted good or service in conjunction with a room reservation or banquet contract (e.g., free breakfast and free room night for every four nights booked). These substantive rights are considered separate performance obligations to which a portion of the transaction price is allocated based on the estimated standalone selling prices of the good or service, adjusted for the likelihood the hotel guest will exercise the right. Other revenues Other revenues include revenues generated by the incidental support of hotel operations for owned, leased, managed and franchised hotels, including purchasing operations, and other operating income. Purchasing revenues include any amounts received for vendor rebate arrangements that we participate in as a manager of hotels. Taxes and fees collected on behalf of governmental agencies We are required to collect certain taxes and fees from customers on behalf of governmental agencies and remit these back to the applicable governmental agencies on a periodic basis. We have a legal obligation to act as a collection agent. We do not retain these taxes and fees and, therefore, they are not included in our measurement of transaction prices. We have elected to present revenue net of sales taxes and other similar taxes. We record a liability when the amounts are collected and relieve the liability when payments are made to the applicable taxing authority or other appropriate governmental agency.
Discontinued Operations, Policy [Policy Text Block]		Discontinued Operations In determining whether a group of assets that is disposed (or to be disposed) should be presented as a discontinued operation, we analyze whether the group of assets being disposed represents a component of the Company; that is, whether it had historic operations and cash flows that were clearly distinguished, both operationally and for financial reporting purposes. In addition, we consider whether the disposal represents a strategic shift that has or will have a major effect on our operations and financial results. The historical results and financial position of discontinued operations are separately presented in our consolidated financial statements.
Cash and Cash Equivalents, Unrestricted Cash and Cash Equivalents, Policy [Policy Text Block]		Cash and Cash Equivalents Cash and cash equivalents include all highly liquid investments with original maturities, when purchased, of three months or less.
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]		Restricted Cash and Cash Equivalents Restricted cash and cash equivalents include cash balances established as security for certain guarantees, ground rent and property tax escrows, insurance, including self-insurance collateral, and furniture, fixtures and equipment replacement reserves required under certain lease agreements.
Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block]		Allowance for Doubtful Accounts An allowance for doubtful accounts is provided on accounts receivable when losses are probable based on historical collection activity and current business conditions.
Contract assets [Policy Text Block]		Contract Assets Contract assets relate to incentive management fees for which the period of service has passed, but for which our right to consideration is conditional upon completing the requirements of the incentive fee period. Contract assets are included in other current assets in our consolidated balance sheets and are reclassified to accounts receivable when our right to consideration becomes unconditional.
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]		Goodwill Goodwill represents the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. We do not amortize goodwill, but rather evaluate goodwill for potential impairment on an annual basis or at other times during the year if events or circumstances indicate that it is more likely than not that the fair value of a reporting unit is below the carrying amount. In connection with the October 24, 2007 transaction whereby we became a wholly owned subsidiary of affiliates of Blackstone (the "Merger"), we recorded goodwill representing the excess purchase price over the fair value of the other identified assets and liabilities. We evaluate goodwill for potential impairment by comparing the carrying values of our reporting units to their fair values. Our reporting units are the same as our operating segments as described in Note 19: "Business Segments." In any year we may elect to perform a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is in excess of its carrying value. If we cannot determine qualitatively that the fair value is in excess of the carrying value, or if we decide to bypass the qualitative assessment, we perform a quantitative analysis. The quantitative analysis is used to identify both the existence of impairment and the amount of the impairment loss by comparing the estimated fair value of a reporting unit to its carrying value, including goodwill. The estimated fair value is based on internal projections of expected future cash flows and operating plans, as well as market conditions relative to the operations of our reporting units. If the estimated fair value of the reporting unit exceeds its carrying value, goodwill of the reporting unit is not impaired; otherwise, an impairment loss would be recognized in our consolidated statements of operations in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit.
Goodwill and Intangible Assets, Intangible Assets, Indefinite-Lived, Policy [Policy Text Block]		Brands We manage, franchise, own and lease hotels under our portfolio of brands. There are no legal, regulatory, contractual, competitive, economic or other factors that limit the useful lives of these brands and, accordingly, the useful lives of these brands are considered to be indefinite. As of December 31, 2018 , our brand portfolio included Waldorf Astoria Hotels & Resorts, LXR Hotels & Resorts, Conrad Hotels & Resorts, Canopy by Hilton, Hilton Hotels & Resorts, Curio Collection by Hilton, DoubleTree by Hilton, Tapestry Collection by Hilton, Embassy Suites by Hilton, Motto by Hilton, Hilton Garden Inn, Hampton by Hilton, Tru by Hilton, Homewood Suites by Hilton, Home2 Suites by Hilton and our timeshare brand, Hilton Grand Vacations. At the time of the Merger, our brands were assigned a fair value based on a common valuation technique known as the relief from royalty approach. LXR Hotels & Resorts, Canopy by Hilton, Curio Collection by Hilton, Tapestry Collection by Hilton, Motto by Hilton, Tru by Hilton, and Home2 Suites by Hilton were launched post-Merger and, as such, they were not assigned fair values, and we do not have any intangible assets for these brands recorded in our consolidated balances sheets. We evaluate our brands intangible assets for impairment on an annual basis or at other times during the year if indicators of impairment exist. In any year we may elect to perform a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is in excess of its carrying value. If we cannot determine qualitatively that the fair value is in excess of the carrying value, or if we decide to bypass the qualitative assessment, we perform a quantitative analysis. The estimated fair value is based on internal projections of expected future cash flows. If a brand intangible asset's estimated current fair value is less than its respective carrying value, the excess of the carrying value over the estimated fair value is recognized in our consolidated statements of operations as an impairment loss.
Intangible Assets, Finite-Lived, Policy [Policy Text Block]		Intangible Assets with Finite Useful Lives We have certain finite lived intangible assets that were initially recorded at their fair value at the time of the Merger. These intangible assets consist of management contracts, franchise contracts, leases, certain proprietary technologies and our Hilton Honors guest loyalty program. Additionally, we capitalize cash consideration paid to incentivize hotel owners to enter into management and franchise contracts with us as contract acquisition costs and the incremental costs to obtain or fulfill the contracts as development commissions, which are generally fixed. We also capitalize costs incurred to develop internal-use computer software and costs to acquire software licenses, as well as internal and external costs incurred in connection with the development of upgrades or enhancements that result in additional information technology functionality. Intangible assets with finite useful lives are amortized using the straight-line method over their respective estimated useful lives, which for contract acquisition costs and development commissions is the contract term, including any renewal periods that are at our sole option. These estimated useful lives are generally as follows: management contracts recorded at the Merger ( 13 to 16 years); management contract acquisition costs and development commissions ( 20 to 30 years); franchise contracts recorded at the Merger ( 12 to 13 years); franchise contract acquisition costs and development commissions ( 10 to 20 years); leases ( 12 to 35 years); Hilton Honors ( 16 years); and capitalized software development costs ( 3 years). In our consolidated statements of operations, the amortization of these intangible assets, excluding contract acquisition costs, is included in depreciation and amortization expense, and the amortization of contract acquisition costs is recognized as a reduction to franchise and licensing fees and base and other management fees, based on contract type. Costs incurred prior to the acquisition of a contract, such as external legal costs, are expensed as incurred and included in general and administrative expenses in our consolidated statements of operations. Cash flows for contract acquisition costs and development commissions are included as operating activities in our consolidated statements of cash flows, and cash flows for software development costs are included as investing activities. We review all finite lived intangible assets for impairment when indicators of impairment exist. We perform an analysis to determine the recoverability of the asset group carrying value by comparing the expected undiscounted future cash flows to the net book value of the asset group. If the carrying value of the asset group is not recoverable, we recognize an impairment loss for the excess carrying value over the estimated fair value in our consolidated statements of operations.
Property, Plant and Equipment, Policy [Policy Text Block]		Property and Equipment Property and equipment are recorded at cost. Costs of improvements that extend the economic life or improve service potential are also capitalized. Capitalized costs are depreciated over their estimated useful lives. Costs for normal repairs and maintenance are expensed as incurred. Depreciation is recorded using the straight-line method over the assets' estimated useful lives, which are generally as follows: buildings and improvements ( 8 to 40 years), furniture and equipment ( 3 to 8 years) and computer equipment ( 3 to 5 years). Leasehold improvements are depreciated over the shorter of the estimated useful life, based on the estimates above, or the lease term. We evaluate the carrying value of our property and equipment if there are indicators of impairment. We perform an analysis to determine the recoverability of the asset group carrying value by comparing the expected undiscounted future cash flows to the net book value of the asset group. If it is determined that the expected undiscounted future cash flows are less than the net carrying value of the asset group, the excess of the net carrying value over the estimated fair value is recorded in our consolidated statements of operations within impairment loss. Fair value is generally estimated using valuation techniques that consider the discounted cash flows of the asset group using discount and capitalization rates deemed reasonable for the type of assets, as well as prevailing market conditions, appraisals, recent similar transactions in the market and, if appropriate and available, current estimated net sales proceeds from pending offers. If sufficient information exists to reasonably estimate the fair value of a conditional asset retirement obligation, including environmental remediation liabilities, we recognize the fair value of the obligation when the obligation is incurred, which is generally upon acquisition, construction or development or through the normal operation of the asset.
Contract liabilities [Policy Text Block]		Contract Liabilities Contract liabilities relate to: (i) advance consideration received from hotel owners at contract inception for services considered to be part of the contract performance obligations, such as application, initiation and other fees; (ii) advance consideration received for certain indirect reimbursements, such as system implementation fees; and (iii) amounts received when points are issued under Hilton Honors, but for which revenue is not yet recognized, since the related points are not yet redeemed. Contract liabilities related to advance consideration received for fees and certain indirect reimbursements are recognized as revenue over the term of the related contract. Contract liabilities related to amounts received for Hilton Honors are recognized as revenue when the points are redeemed for a free good or service by the Hilton Honors member, which, on average, occurs within two years of points issuance. Contract liabilities are included in deferred revenues in our consolidated balance sheets.
Revenue Recognition, Loyalty Programs [Policy Text Block]		Hilton Honors Hilton Honors is our guest loyalty and marketing program provided to our hotel and resort properties. Nearly all of our managed, franchised, owned and leased properties participate in the Hilton Honors program. Hilton Honors members earn points based on their spending at our participating properties and through participation in affiliated partner programs. When points are earned by Hilton Honors members, they are provided with a substantive right to free or discounted goods or services in the future upon accumulation of the required level of Hilton Honors points. Points may be redeemed for the right to stay at participating properties, as well as for other goods and services from third parties, including, but not limited to, airlines, car rentals, cruises, vacation packages, shopping and dining. As points are issued to a Hilton Honors member, the property or program partner pays Hilton Honors based on an estimated cost per point for the costs of operating the program, which include marketing, promotion, communication and administrative expenses, as well as the estimated cost of award redemptions. When these payments are received we record amounts equal to the estimated cost per point of the future redemption obligation within the liability for guest loyalty program and any amounts received in excess of the estimated cost per point within deferred revenues in our consolidated balance sheets. We engage outside actuaries to assist in determining the fair value of the future redemption obligation using statistical formulas that project future point redemptions based on factors that include historical experience, an estimate of points that will eventually be redeemed, which includes an estimate of "breakage" for points that will never be redeemed, and the cost of reimbursing properties and other third parties with respect to other redemption opportunities available to Hilton Honors members. When points are issued as a result of a stay at an owned or leased hotel, we recognize a reduction in owned and leased hotel revenues, since we are also the guest loyalty program sponsor. For the Hilton Honors fees that are charged to the participating properties, we allocate the fees to the substantive right created by the Hilton Honors points that are issued using the variable consideration allocation guidance, since the fees are directly related to the issuance of Hilton Honors points to the Hilton Honors member and Hilton's efforts to satisfy the future redemption of those Hilton Honors points. The transaction prices for the Hilton Honors points are reduced by the expected payments to the third parties that will provide the free or discounted room or service using the actuarial projection of the cost per point. The remaining transaction price is then further allocated to the points that are expected to be redeemed, adjusting the points that are issued for estimated breakage, and recognized when those points are redeemed. While the points are outstanding, both the estimate of the expected payments to third parties (cost per point) and the estimated breakage are reevaluated, and the amount of revenue recognized when each point is redeemed is adjusted so that the final amount allocated to the substantive right of the customer to use the point is reflective of the amount retained for providing the free or discounted goods and services, net of the payments to third parties and points not redeemed. We also earn licensing fees from co-brand credit card arrangements (see "Management and franchise revenues" within the "Revenue Recognition" section above). The co-brand license fee is allocated between two performance obligations based on their estimated standalone selling prices: (i) an IP license using the relief-from-royalty method and (ii) substantive rights for free or discounted goods or services to the credit card customers using a cost plus method based on an evaluation of other third-party administrators. We satisfy our performance obligation related to points issued under Hilton Honors when points are redeemed for a free or discounted good or service by the Hilton Honors member, and we satisfy our remaining performance obligations over time as the customer simultaneously receives and consumes the benefits of the goods or services provided. Hilton Honors reimburses participating properties and applicable third parties when points are redeemed by members, at which time the redemption obligation is reduced and the related deferred revenue is recognized in other revenues from managed and franchised properties in our consolidated statements of operations. Additionally, when Hilton Honors members redeem award certificates at our owned and leased hotels, we recognize room revenue, included in owned and leased hotel revenues in our consolidated statements of operations.
Fair Value Measurement, Policy [Policy Text Block]		Fair Value Measurements – Valuation Hierarchy Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date (i.e., an exit price). We use the three-level valuation hierarchy for classification of fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. Inputs refer broadly to the assumptions that market participants would use in pricing an asset or liability. Inputs may be observable or unobservable. Observable inputs are inputs that reflect the assumptions market participants would use in pricing the asset or liability developed based on market data obtained from independent sources. Unobservable inputs are inputs that reflect our own assumptions about the data market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. The three-tier hierarchy of inputs is summarized below: • Level 1 – Valuation is based upon quoted prices (unadjusted) for identical assets or liabilities in active markets. • Level 2 – Valuation is based upon quoted prices for similar assets and liabilities in active markets, or other inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the instrument. • Level 3 – Valuation is based upon other unobservable inputs that are significant to the fair value measurement. The classification of assets and liabilities within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement in its entirety. Proper classification of fair value measurements within the valuation hierarchy is considered each reporting period. The use of different market assumptions or estimation methods may have a material effect on the estimated fair value amounts.
Derivatives, Policy [Policy Text Block]		Derivative Instruments We use derivative instruments as part of our overall strategy to manage our exposure to market risks associated with fluctuations in interest rates and foreign currency exchange rates. We regularly monitor the financial stability and credit standing of the counterparties to our derivative instruments. We do not enter into derivative financial instruments for trading or speculative purposes. We record all derivatives at fair value. On the date the derivative contract is entered into, we may designate the derivative as one of the following: a hedge of a forecasted transaction or the variability of cash flows to be paid ("cash flow hedge"), a hedge of the fair value of a recognized asset or liability ("fair value hedge") or a hedge of our investment in a foreign operation ("net investment hedge"). Changes in the fair value of a derivative that is qualified, designated and highly effective as a cash flow hedge or net investment hedge are recorded in other comprehensive income (loss) in our consolidated statements of comprehensive income (loss) until they are reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. Changes in the fair value of a derivative that is qualified, designated and highly effective as a fair value hedge, along with the gain or loss on the hedged asset or liability that is attributable to the hedged risk, are recorded in current period earnings. If we do not specifically designate a derivative as one of the above, changes in the fair value of the undesignated derivative instrument are reported in current period earnings. Likewise, the ineffective portion of designated derivative instruments is reported in current period earnings. Cash flows from designated derivative financial instruments are classified within the same category as the item being hedged in the consolidated statements of cash flows, while cash flows from undesignated derivative financial instruments are included as an investing activity. If we determine that we qualify for and will designate a derivative as a hedging instrument, at the designation date we formally document all relationships between hedging activities, including the risk management objective and strategy for undertaking various hedge transactions. This process includes matching all derivatives that are designated as cash flow hedges to specific forecasted transactions, linking all derivatives designated as fair value hedges to specific assets and liabilities in the consolidated balance sheets and determining the foreign currency exposure of the net investment of the foreign operation for a net investment hedge. On a quarterly basis, we assess the effectiveness of our designated hedges in offsetting the variability in the cash flows or fair values of the hedged assets or obligations using the Hypothetical Derivative Method. This method compares the cumulative change in fair value of each hedging instrument to the cumulative change in fair value of a hypothetical hedging instrument, which has terms that identically match the critical terms of the respective hedged transactions. Thus, the hypothetical hedging instrument is presumed to perfectly offset the hedged cash flows. Ineffectiveness results when the cumulative change in the fair value of the hedging instrument exceeds the cumulative change in the fair value of the hypothetical hedging instrument. We discontinue hedge accounting prospectively when the derivative is no longer highly effective as a hedge, the underlying hedged transaction is no longer probable or the hedging instrument expires, is sold, terminated or exercised.
Foreign Currency Transactions and Translations Policy [Policy Text Block]		Currency Translation The United States dollar ("USD") is our reporting currency and is the functional currency of our consolidated and unconsolidated entities operating in the U.S. The functional currency for our consolidated and unconsolidated entities operating outside of the U.S. is the currency of the primary economic environment in which the respective entity operates. Assets and liabilities measured in foreign currencies are translated into USD at the prevailing exchange rates in effect as of the financial statement date and the related gains and losses, net of applicable deferred income taxes, are reflected in accumulated other comprehensive income (loss) in our consolidated balance sheets. Income and expense accounts are translated at the average exchange rate for the period. Gains and losses from foreign currency exchange rate changes related to transactions denominated in a currency other than an entity's functional currency or intercompany receivables and payables denominated in a currency other than an entity's functional currency that are not of a long-term investment nature are recognized as gain (loss) on foreign currency transactions in our consolidated statements of operations. Where certain specific evidence indicates intercompany receivables and payables will not be settled in the foreseeable future and are of a long-term nature, gains and losses from foreign currency exchange rate changes are recognized as other comprehensive income (loss) in our consolidated statements of comprehensive income (loss).
Self Insurance Reserve [Policy Text Block]		Insurance We are self-insured for losses up to our third-party insurance deductibles for general liability, auto liability and workers' compensation at our owned, leased and managed properties that participate in our programs. We purchase insurance coverage for claim amounts that exceed our deductible obligations. In addition, through our captive insurance subsidiary, we participate in reinsurance arrangements that provide coverage for a certain portion of our deductibles and/or acts as a financial intermediary for claim payments on our self-insurance program, along with property and casualty insurance for certain international hotels that are reinsured by other third parties. These obligations and reinsurance arrangements can cause timing differences in the recognition of assets, liabilities, gains and losses between reporting periods, although these amounts ultimately offset when the related claims are settled. Our insurance reserves are accrued based on our deductibles related to the estimated ultimate cost of claims that occurred during the covered period, which includes claims incurred but not reported, for which we will be responsible. These estimates are prepared with the assistance of outside actuaries and consultants. The ultimate cost of claims for a covered period may differ from our original estimates.
Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]		Share-based Compensation As part of our 2013 and 2017 Omnibus Incentive Plans, we award time-vesting restricted stock units and restricted stock ("RSUs"), nonqualified stock options ("options") and performance-vesting restricted stock units and restricted stock (collectively, "performance shares") to our eligible employees and deferred share units ("DSUs") to members of our board of directors. • RSUs generally vest in equal annual installments over two or three years from the date of grant. Vested RSUs generally will be settled for the Company's common stock, with the exception of certain awards that will be settled in cash. The grant date fair value per share is equal to the closing stock price on the grant date. • Options vest over three years in equal annual installments from the grant date and terminate 10 years from the grant date or earlier if the individual's service terminates under certain circumstances. The exercise price is equal to the closing stock price on the grant date. The grant date fair value per share is estimated using the Black-Scholes-Merton option-pricing model. • Performance shares are settled at the end of a three -year performance period with 50 percent of the awards subject to achievement based on the compound annual growth rate ("CAGR") of the Company's adjusted earnings before interest expense, a provision for income taxes and depreciation and amortization ("Adjusted EBITDA"), referred to as EBITDA CAGR, and the other 50 percent of the awards subject to achievement based on the Company's free cash flow ("FCF") per share CAGR, referred to as FCF CAGR. The total number of performance shares that vest related to each performance measure is based on an achievement factor that, in both cases, ranges from a zero percent to 200 percent payout. The grant date fair value per share for these awards is equal to the closing stock price on the grant date. • DSUs are issued to our independent directors and are fully vested and non-forfeitable on the grant date. DSUs are settled for shares of the Company's common stock, which are deliverable upon the earlier of termination of the individual's service on our board of directors or a change in control. The grant date fair value per share is equal to the closing stock price on the grant date. We recognize these share-based payment transactions when services from the employees are received and recognize either a corresponding increase in additional paid-in capital or accounts payable, accrued expenses and other in our consolidated balance sheets, depending on whether the instruments granted satisfy the equity or liability classification criteria. The measurement objective for these equity awards is the estimated fair value at the grant date of the equity instruments that we are obligated to issue when employees have rendered the requisite service and satisfied any other conditions necessary to earn the right to benefit from the instruments. The compensation expense for an award classified as an equity instrument is recognized ratably over the requisite service period, which is the period during which an employee is required to provide service in exchange for an award. Liability awards are measured based on the award's fair value and the fair value is remeasured at each reporting date until the date of settlement. Compensation expense for each period until settlement is based on the change (or a portion of the change, depending on the percentage of the requisite service that has been rendered at the reporting date) in the fair value of the instrument for each reporting period for such liability awards. Compensation expense for awards with performance conditions is recognized over the requisite service period if it is probable that the performance condition will be satisfied. If such performance conditions are not considered probable until they occur, no compensation expense for these awards is recognized.
Income Tax, Policy [Policy Text Block]		Income Taxes We account for income taxes using the asset and liability method. The objectives of accounting for income taxes are to recognize the amount of taxes payable or refundable for the current year and to recognize the deferred tax assets and liabilities that relate to tax consequences in future years, which result from differences between the respective tax basis of assets and liabilities and their financial reporting amounts and tax attribute carryforwards. Deferred tax assets and liabilities are measured using the enacted tax rates in effect for the year in which the respective temporary differences or operating loss or tax credit carryforwards are expected to be recovered or settled. The realization of deferred tax assets and tax loss and tax credit carryforwards is contingent upon the generation of future taxable income and other restrictions that may exist under the tax laws of the jurisdiction in which a deferred tax asset exists. Valuation allowances are provided to reduce such deferred tax assets to amounts more likely than not to be ultimately realized. On December 22, 2017, H.R.1, known as the Tax Cuts and Jobs Act of 2017 (the "TCJ Act") was signed into law and included widespread changes to the Internal Revenue Code including, among other items, the creation of new taxes on certain foreign earnings. The TCJ Act subjects a U.S. stockholder to current tax on global intangible low-taxed income ("GILTI") earned by certain foreign subsidiaries. In addition, the TCJ Act provides for foreign derived intangible income ("FDII") to be taxed at a lower effective rate than the statutory rate by allowing a tax deduction against the income. Interpretive guidance on the accounting for GILTI states that an entity can make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI in the year the tax is incurred as a period expense only. We have elected to recognize the current tax on GILTI as an expense in the period the tax is incurred. We include the current tax impact of both GILTI and the FDII deduction in our effective tax rate. See Note 14: "Income Taxes" for additional information on the effects of the TCJ Act on our consolidated financial statements. We use a prescribed recognition threshold for the financial statement recognition and measurement of a tax position taken in a tax return. For all income tax positions, we first determine whether it is "more-likely-than-not" that a tax position will be sustained upon examination, including resolution of any related appeals or litigation processes, based on the technical merits of the position. If it is determined that a position meets the more-likely-than-not recognition threshold, the benefit recognized in the financial statements is measured as the largest amount of benefit that is greater than 50 percent likely of being realized upon settlement.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Issued Accounting Pronouncements In August 2018, the Financial Accounting Standards Board ("FASB") issued ASU No. 2018-15 ("ASU 2018-15"), Intangibles – Goodwill and Other – Internal-use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. This ASU aligns guidance for capitalizing implementation costs incurred in a cloud computing arrangement that is a service contract with guidance for capitalizing implementation costs to develop or obtain internal-use software. Capitalized implementation costs will be amortized over the term of the arrangement and presented in the same line item in the statement of operations as the fees associated with the service contract. We elected, as permitted by the standard, to early adopt ASU 2018-05 on a prospective basis as of January 1, 2019. The adoption did not have a material effect on our condensed consolidated financial statements. In February 2016, the FASB issued ASU 2016-02 , which supersedes existing guidance on accounting for leases in Leases (Topic 840) and generally requires all leases, including operating leases, to be recognized in the statement of financial position of lessees as ROU assets and lease liabilities, with certain practical expedients available. Subsequent to ASU 2016-02, the FASB issued related ASUs, including ASU No. 2018-11 ("ASU 2018-11"), Leases (Topic 842): Targeted Improvements, which provides for another transition method in addition to the modified retrospective approach required by ASU 2016-02. This option allows entities to initially apply the new leases standard at the adoption date and recognize a cumulative adjustment to the opening balance of retained earnings in the period of adoption. As described above, we adopted ASU 2016-02 on January 1, 2019 and applied the package of practical expedients included therein, as well as utilized the transition method included in ASU 2018-11. By applying ASU 2016-02 at the adoption date, as opposed to at the beginning of the earliest period presented, the presentation of financial information for periods prior to January 1, 2019 remain unchanged and in accordance with Leases (Topic 840) . On January 1, 2019, we recognized a $256 million cumulative adjustment to accumulated deficit, net of taxes of $81 million related to a decrease to our deferred tax liability, as a result of the impairment of ROU assets that occurred in periods prior to the adoption date.	Recently Issued Accounting Pronouncements Adopted Accounting Standards In February 2018, the Financial Accounting Standards Board ("FASB") issued ASU No. 2018-02 ("ASU 2018-02"), Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income . This ASU permits a reclassification from accumulated other comprehensive income (loss) to retained earnings (deficit) for stranded tax effects that do not reflect the appropriate tax rates as a result of the TCJ Act. We early adopted, as permitted by the standard, the provisions of ASU 2018-02 during the fourth quarter of 2018 and reclassified $16 million from accumulated other comprehensive loss to accumulated deficit as of January 1, 2018. In March 2017, the FASB issued ASU No. 2017-07 ("ASU 2017-07"), Compensation – Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost . This ASU requires employers to report the service cost component of net periodic pension cost in the same line item or items of the statement of operations as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net periodic pension cost must be presented separately from the service cost component and outside of a subtotal of income (loss) from operations. We adopted ASU 2017-07 on January 1, 2018 on a retrospective basis in our consolidated statements of operations, which includes presenting: (i) the service cost component of net periodic pension cost in owned and leased hotel expenses and general and administrative expenses and (ii) the other components of net periodic pension cost in other non-operating income (loss), net. Prior to adoption, all net periodic pension costs were presented in owned and leased hotel expenses and general and administrative expenses. We have applied the practical expedient permitting us to use the amounts disclosed in Note 15: "Employee Benefit Plans" for the prior comparative periods as the estimation basis for applying the retrospective presentation requirements. See the "Prior Period Financial Information" below for the effect of the adoption of ASU 2017-07 on our consolidated statements of operations for the years ended December 31, 2017 and 2016 . In May 2014, the FASB issued ASU 2014-09. This ASU supersedes the revenue recognition requirements in Revenue Recognition (Topic 605) and requires entities to recognize revenue when a customer obtains control of promised goods or services and in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. Subsequent to ASU 2014-09, the FASB issued several related ASUs to clarify the application of the new revenue recognition standard, collectively referred to herein as ASU 2014-09. We adopted the requirements of ASU 2014-09 on January 1, 2018 using the full retrospective approach, as permitted by the standard, resulting in a cumulative adjustment to accumulated deficit of $212 million as of January 1, 2016. The provisions of ASU 2014-09 affected our revenue recognition as follows: • Application, initiation and other fees are recognized over the term of the franchise contract, rather than upon execution of the contract and the unamortized portion of these fees is included in deferred revenues in our consolidated balance sheets. • Contract acquisition costs related to our management and franchise contracts are recognized over the term of the contracts as a reduction to revenue, instead of as amortization expense. This change does not affect net income (loss). • Incentive management fees are recognized to the extent that it is probable that a significant reversal will not occur as a result of future hotel profits or cash flows, as opposed to recognizing amounts that would be due if the management contract was terminated at the end of the reporting period. This change does not affect net income (loss) for any full year period. • Revenue related to our Hilton Honors guest loyalty program is recognized upon point redemption, net of any reward reimbursement paid to a third party, as opposed to recognized on a gross basis at the time points are issued in conjunction with the accrual of the expected future cost of the reward reimbursement. Additionally, points issued at owned and leased hotels are accounted for as a reduction of owned and leased hotel revenues, as opposed to owned and leased hotel expenses. Fees received in excess of the estimated liability for guest loyalty program are included in deferred revenues in our consolidated balance sheets. • Reimbursable fees related to our management and franchise contracts are recognized as they are billed, as opposed to when we incur the related expenses. Timing differences related to the receipt and spend of these fees will no longer be recorded in other assets and other liabilities in our consolidated balance sheets. We have not retrospectively restated for contract modifications of management and franchise contracts that occurred before January 1, 2016. Instead, we have reflected the aggregate effect of all contract modifications when identifying the satisfied and unsatisfied performance obligations, determining the transaction price and allocating the transaction price. The estimated effect of applying this practical expedient is to use a longer period over which to recognize on a straight line basis any fixed consideration either received from the customer or paid to the customer, since all fees will be amortized over the full contract term beginning on the date of initial execution, rather than amortizing fees received upon contract modifications prospectively from the contract modification date. We do not anticipate that this effect is material given the insignificance of the fixed consideration compared to the overall consideration we expect to earn over the term of the contract. We also elected not to disclose the amount of the transaction price and timing of revenue recognition related to our remaining performance obligations as of December 31, 2017 . See the "Prior Period Financial Information" below for the effect of the adoption of ASU 2014-09 on our consolidated balance sheet as of December 31, 2017 and our consolidated statements of operations for the years ended December 31, 2017 and 2016 . Prior Period Financial Information The following table presents the effect of the adoption of ASU 2014-09 for the line items affected in our consolidated balance sheet: December 31, 2017 As Previously Reported Adoption of ASU 2014-09 As Adjusted (in millions) ASSETS Accounts receivable, net $ 998 $ 7 $ 1,005 Prepaid expenses 111 16 127 Other current assets 171 (2 ) 169 Management and franchise contracts, net 909 44 953 Deferred income tax assets 113 (2 ) 111 Other non-current assets 434 (143 ) 291 TOTAL ASSETS 14,308 (80 ) 14,228 LIABILITIES AND EQUITY Current liabilities: Accounts payable, accrued expenses and other (1) 1,487 (71 ) 1,416 Current portion of deferred revenues (1) 41 325 366 Current portion of liability for guest loyalty program (1) 622 — 622 Deferred revenues 97 732 829 Deferred income tax liabilities 1,063 (132 ) 931 Other long-term liabilities 1,470 (550 ) 920 Total liabilities 12,233 304 12,537 Equity: Accumulated deficit (6,596 ) (385 ) (6,981 ) Accumulated other comprehensive loss (742 ) 1 (741 ) Total equity 2,075 (384 ) 1,691 TOTAL LIABILITIES AND EQUITY 14,308 (80 ) 14,228 ____________ (1) The current portion of deferred revenues and current portion of liability for guest loyalty program have been separated from accounts payable, accrued expenses and other in the "As Previously Reported" column to conform with current presentation. The following tables present the effect of the adoption of ASU 2014-09 and ASU 2017-07 on our consolidated statements of operations: Year Ended December 31, 2017 As Previously Reported Adoption of ASU 2014-09 Adoption of ASU 2017-07 As Adjusted (in millions) Revenues Franchise and licensing fees $ 1,382 $ (61 ) $ — $ 1,321 Base and other management fees 336 (12 ) — 324 Incentive management fees 222 — — 222 Owned and leased hotels 1,450 (18 ) — 1,432 Other revenues 105 — — 105 3,495 (91 ) — 3,404 Other revenues from managed and franchised properties 5,645 (918 ) — 4,727 Total revenues 9,140 (1,009 ) — 8,131 Expenses Owned and leased hotels 1,286 (18 ) 1 1,269 Depreciation and amortization 347 (11 ) — 336 General and administrative 434 — 5 439 Other expenses 56 — — 56 2,123 (29 ) 6 2,100 Other expenses from managed and franchised properties 5,645 (746 ) — 4,899 Total expenses 7,768 (775 ) 6 6,999 Operating income 1,372 (234 ) (6 ) 1,132 Interest expense (408 ) 57 — (351 ) Gain on foreign currency transactions 3 — — 3 Loss on debt extinguishment (60 ) — — (60 ) Other non-operating income, net 23 — 6 29 Income before income taxes 930 (177 ) — 753 Income tax benefit 334 2 — 336 Net income 1,264 (175 ) — 1,089 Net income attributable to noncontrolling interests (5 ) — — (5 ) Net income attributable to Hilton stockholders $ 1,259 $ (175 ) $ — $ 1,084 Earnings per share: Basic $ 3.88 $ 3.34 Diluted $ 3.85 $ 3.32 Year Ended December 31, 2016 As Previously Reported Adoption of ASU 2014-09 Adoption of ASU 2017-07 As Adjusted (in millions) Revenues Franchise and licensing fees $ 1,154 $ (63 ) $ — $ 1,091 Base and other management fees 242 (12 ) — 230 Incentive management fees 142 — — 142 Owned and leased hotels 1,452 (18 ) — 1,434 Other revenues 82 — — 82 3,072 (93 ) — 2,979 Other revenues from managed and franchised properties 4,310 (713 ) — 3,597 Total revenues 7,382 (806 ) — 6,576 Expenses Owned and leased hotels 1,295 (18 ) 2 1,279 Depreciation and amortization 364 (11 ) — 353 General and administrative 403 — 6 409 Other expenses 66 — — 66 2,128 (29 ) 8 2,107 Other expenses from managed and franchised properties 4,310 (701 ) — 3,609 Total expenses 6,438 (730 ) 8 5,716 Gain on sales of assets, net 8 — — 8 Operating income 952 (76 ) (8 ) 868 Interest expense (394 ) 60 — (334 ) Loss on foreign currency transactions (16 ) — — (16 ) Other non-operating income, net 14 — 8 22 Income from continuing operations before income taxes 556 (16 ) — 540 Income tax expense (564 ) 7 — (557 ) Loss from continuing operations, net of taxes (8 ) (9 ) — (17 ) Income from discontinued operations, net of taxes 372 (1 ) — 371 Net income 364 (10 ) — 354 Net income attributable to noncontrolling interests (16 ) — — (16 ) Net income attributable to Hilton stockholders $ 348 $ (10 ) $ — $ 338 Earnings (loss) per share: Basic: Net loss from continuing operations per share $ (0.05 ) $ (0.08 ) Net income from discontinued operations per share 1.11 1.11 Net income per share $ 1.06 $ 1.03 Diluted: Net loss from continuing operations per share $ (0.05 ) $ (0.08 ) Net income from discontinued operations per share 1.11 1.11 Net income per share $ 1.06 $ 1.03 Accounting Standards Not Yet Adopted In August 2018, the FASB issued ASU No. 2018-15 ("ASU 2018-15"), Intangibles – Goodwill and Other – Internal-use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. This ASU aligns guidance for capitalizing implementation costs incurred in a cloud computing arrangement that is a service contract with guidance for capitalizing implementation costs to develop or obtain internal-use software. Capitalized implementation costs will be amortized over the term of the arrangement and presented in the same line item in the statement of operations as the fees associated with the service contract. The provisions of ASU 2018-15 are effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years; early adoption is permitted. We intend to adopt ASU 2018-15 on January 1, 2019 on a prospective basis, and we do not expect it to have a material effect on our consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02 ("ASU 2016-02"), Leases (Topic 842), which supersedes existing guidance on accounting for leases in Leases (Topic 840) and generally requires all leases, including operating leases, to be recognized in the statement of financial position of lessees as right-of-use ("ROU") assets and lease liabilities, with certain practical expedients available. Subsequent to ASU 2016-02, the FASB issued related ASUs, including ASU No. 2018-11 ("ASU 2018-11"), Leases (Topic 842): Targeted Improvements, which provides for another transition method in addition to the modified retrospective approach required by ASU 2016-02. This option allows entities to initially apply the new leases standard at the adoption date and recognize a cumulative adjustment to the opening balance of retained earnings in the period of adoption. We will adopt ASU 2016-02 on January 1, 2019 and apply the package of practical expedients included therein, as well as utilize the transition method included in ASU 2018-11. By applying ASU 2016-02 at the adoption date, as opposed to at the beginning of the earliest period presented, the presentation of financial information for periods prior to January 1, 2019 will remain unchanged and in accordance with Leases (Topic 840) . On January 1, 2019, we expect to recognize additional ROU assets of between $0.9 billion and $1.1 billion and lease liabilities of between $1.2 billion and $1.4 billion in our consolidated balance sheet, with the difference recognized in accumulated deficit as a result of the impairment of ROU assets that occurred in periods prior to the adoption date. In preparation for the adoption, we have designed internal controls and information system functionality to enable the preparation of the necessary financial information and have reached conclusions on key accounting assessments.

Basis of Presentation and Sum_3

Basis of Presentation and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]	The following table presents the effect of the adoption of ASU 2014-09 for the line items affected in our consolidated balance sheet: December 31, 2017 As Previously Reported Adoption of ASU 2014-09 As Adjusted (in millions) ASSETS Accounts receivable, net $ 998 $ 7 $ 1,005 Prepaid expenses 111 16 127 Other current assets 171 (2 ) 169 Management and franchise contracts, net 909 44 953 Deferred income tax assets 113 (2 ) 111 Other non-current assets 434 (143 ) 291 TOTAL ASSETS 14,308 (80 ) 14,228 LIABILITIES AND EQUITY Current liabilities: Accounts payable, accrued expenses and other (1) 1,487 (71 ) 1,416 Current portion of deferred revenues (1) 41 325 366 Current portion of liability for guest loyalty program (1) 622 — 622 Deferred revenues 97 732 829 Deferred income tax liabilities 1,063 (132 ) 931 Other long-term liabilities 1,470 (550 ) 920 Total liabilities 12,233 304 12,537 Equity: Accumulated deficit (6,596 ) (385 ) (6,981 ) Accumulated other comprehensive loss (742 ) 1 (741 ) Total equity 2,075 (384 ) 1,691 TOTAL LIABILITIES AND EQUITY 14,308 (80 ) 14,228 ____________ (1) The current portion of deferred revenues and current portion of liability for guest loyalty program have been separated from accounts payable, accrued expenses and other in the "As Previously Reported" column to conform with current presentation. The following tables present the effect of the adoption of ASU 2014-09 and ASU 2017-07 on our consolidated statements of operations: Year Ended December 31, 2017 As Previously Reported Adoption of ASU 2014-09 Adoption of ASU 2017-07 As Adjusted (in millions) Revenues Franchise and licensing fees $ 1,382 $ (61 ) $ — $ 1,321 Base and other management fees 336 (12 ) — 324 Incentive management fees 222 — — 222 Owned and leased hotels 1,450 (18 ) — 1,432 Other revenues 105 — — 105 3,495 (91 ) — 3,404 Other revenues from managed and franchised properties 5,645 (918 ) — 4,727 Total revenues 9,140 (1,009 ) — 8,131 Expenses Owned and leased hotels 1,286 (18 ) 1 1,269 Depreciation and amortization 347 (11 ) — 336 General and administrative 434 — 5 439 Other expenses 56 — — 56 2,123 (29 ) 6 2,100 Other expenses from managed and franchised properties 5,645 (746 ) — 4,899 Total expenses 7,768 (775 ) 6 6,999 Operating income 1,372 (234 ) (6 ) 1,132 Interest expense (408 ) 57 — (351 ) Gain on foreign currency transactions 3 — — 3 Loss on debt extinguishment (60 ) — — (60 ) Other non-operating income, net 23 — 6 29 Income before income taxes 930 (177 ) — 753 Income tax benefit 334 2 — 336 Net income 1,264 (175 ) — 1,089 Net income attributable to noncontrolling interests (5 ) — — (5 ) Net income attributable to Hilton stockholders $ 1,259 $ (175 ) $ — $ 1,084 Earnings per share: Basic $ 3.88 $ 3.34 Diluted $ 3.85 $ 3.32 Year Ended December 31, 2016 As Previously Reported Adoption of ASU 2014-09 Adoption of ASU 2017-07 As Adjusted (in millions) Revenues Franchise and licensing fees $ 1,154 $ (63 ) $ — $ 1,091 Base and other management fees 242 (12 ) — 230 Incentive management fees 142 — — 142 Owned and leased hotels 1,452 (18 ) — 1,434 Other revenues 82 — — 82 3,072 (93 ) — 2,979 Other revenues from managed and franchised properties 4,310 (713 ) — 3,597 Total revenues 7,382 (806 ) — 6,576 Expenses Owned and leased hotels 1,295 (18 ) 2 1,279 Depreciation and amortization 364 (11 ) — 353 General and administrative 403 — 6 409 Other expenses 66 — — 66 2,128 (29 ) 8 2,107 Other expenses from managed and franchised properties 4,310 (701 ) — 3,609 Total expenses 6,438 (730 ) 8 5,716 Gain on sales of assets, net 8 — — 8 Operating income 952 (76 ) (8 ) 868 Interest expense (394 ) 60 — (334 ) Loss on foreign currency transactions (16 ) — — (16 ) Other non-operating income, net 14 — 8 22 Income from continuing operations before income taxes 556 (16 ) — 540 Income tax expense (564 ) 7 — (557 ) Loss from continuing operations, net of taxes (8 ) (9 ) — (17 ) Income from discontinued operations, net of taxes 372 (1 ) — 371 Net income 364 (10 ) — 354 Net income attributable to noncontrolling interests (16 ) — — (16 ) Net income attributable to Hilton stockholders $ 348 $ (10 ) $ — $ 338 Earnings (loss) per share: Basic: Net loss from continuing operations per share $ (0.05 ) $ (0.08 ) Net income from discontinued operations per share 1.11 1.11 Net income per share $ 1.06 $ 1.03 Diluted: Net loss from continuing operations per share $ (0.05 ) $ (0.08 ) Net income from discontinued operations per share 1.11 1.11 Net income per share $ 1.06 $ 1.03

Discontinued Operations (Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2018
Discontinued Operations and Disposal Groups [Abstract]
Schedules of Discontinued Operations	The following table presents the results of operations of Park and HGV that were included in discontinued operations in our consolidated statement of operations for the year ended December 31, 2016: (in millions) Total revenues from discontinued operations $ 4,236 Expenses Owned and leased hotels 1,770 Timeshare 942 Depreciation and amortization 320 Other 298 Total expenses from discontinued operations 3,330 Gain on sales of assets, net 1 Operating income from discontinued operations 907 Non-operating loss, net (210 ) Income from discontinued operations before income taxes 697 Income tax expense (326 ) Income from discontinued operations, net of taxes 371 Income from discontinued operations attributable to noncontrolling interests, net of taxes (6 ) Income from discontinued operations attributable to Hilton stockholders, net of taxes $ 365 The following table presents selected financial information of Park and HGV that was included in our consolidated statement of cash flows for the year ended December 31, 2016: (in millions) Non-cash items included in net income: Depreciation and amortization $ 320 Gain on sales of assets, net (1 ) Investing activities: Capital expenditures for property and equipment $ (255 )

Revenues from Contracts with _2

Revenues from Contracts with Customers (Tables)	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Contract with Customer, Asset and Liability	The following table summarizes the activity of our contract liabilities, which are classified as a component of current and long-term deferred revenues, during the six months ended June 30, 2019 : (in millions) Balance as of December 31, 2018 $ 1,060 Cash received in advance and not recognized as revenue (1) 220 Revenue recognized (1) (135 ) Other (2) (92 ) Balance as of June 30, 2019 $ 1,053 ____________ (1) Primarily related to Hilton Honors, our guest loyalty program. (2) Primarily the result of changes in estimated transaction prices for our performance obligations related to points issued under Hilton Honors, which had no effect on revenues.	The following table summarizes the activity of our contract liabilities during the year ended December 31, 2018: in millions Balance as of December 31, 2017 $ 1,087 Cash received in advance and not recognized as revenue (1) 377 Revenue recognized (1) (229 ) Other (2) (175 ) Balance as of December 31, 2018 $ 1,060 ____________ (1) Primarily related to Hilton Honors. (2) Primarily the result of changes in estimated transaction prices for our performance obligations related to points issued under Hilton Honors, which had no effect on revenues.

Consolidated Variable Interes_2

Consolidated Variable Interest Entities (Tables)	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Variable Interest Entities [Table Text Block]	Our condensed consolidated balance sheets included the assets and liabilities of the VIEs that we consolidated as of the respective periods, which primarily comprised the following: June 30, December 31, 2019 2018 (in millions) Cash and cash equivalents $ 72 $ 71 Property and equipment, net 73 68 Deferred income tax assets 51 53 Other non-current assets 61 58 Accounts payable, accrued expenses and other 52 41 Long-term debt (1) 204 205 Other long-term liabilities 15 15 ____________ (1) Includes finance lease liabilities of $186 million and $187 million as of June 30, 2019 and December 31, 2018 , respectively.	Our consolidated balance sheets included the assets and liabilities of these entities, which primarily comprised the following: December 31, 2018 2017 (in millions) Cash and cash equivalents $ 71 $ 73 Accounts receivable, net 15 16 Property and equipment, net 68 57 Deferred income tax assets 53 56 Other non-current assets 58 57 Accounts payable, accrued expenses and other 41 43 Long-term debt (1) 205 212 Other long-term liabilities 15 13 ____________ (1) Includes capital lease obligations of $187 million and $191 million as of December 31, 2018 and 2017, respectively.

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill		Our goodwill balances, by reporting unit, were as follows: Ownership (1) Management and Franchise (2) Total (in millions) Balance as of December 31, 2016 $ 184 $ 5,034 $ 5,218 Spin-off of Park (91 ) — (91 ) Foreign currency translation 11 52 63 Balance as of December 31, 2017 104 5,086 5,190 Foreign currency translation (5 ) (25 ) (30 ) Balance as of December 31, 2018 $ 99 $ 5,061 $ 5,160 ____________ (1) Amounts for the ownership reporting unit include the following gross carrying values and accumulated impairment losses for the periods presented: Gross Carrying Value Accumulated Impairment Losses Net Carrying Value (in millions) Balance as of December 31, 2016 $ 856 $ (672 ) $ 184 Spin-off of Park (423 ) 332 (91 ) Foreign currency translation 11 — 11 Balance as of December 31, 2017 444 (340 ) 104 Foreign currency translation (5 ) — (5 ) Balance as of December 31, 2018 $ 439 $ (340 ) $ 99 (2) There were no accumulated impairment losses for the management and franchise reporting unit as of December 31, 2018, 2017 and 2016.
Schedule Of Intangible Assets, Excluding Goodwill	Amortizing intangible assets were as follows: June 30, 2019 Gross Carrying Value Accumulated Amortization Net Carrying Value (in millions) Management and franchise contracts: Management and franchise contracts recorded at Merger (1) $ 2,232 $ (1,960 ) $ 272 Contract acquisition costs 548 (108 ) 440 Development commissions and other 122 (17 ) 105 $ 2,902 $ (2,085 ) $ 817 Other intangible assets: Leases (1) $ 287 $ (167 ) $ 120 Capitalized software costs 547 (358 ) 189 Hilton Honors (1) 338 (247 ) 91 Other (1) 34 (34 ) — $ 1,206 $ (806 ) $ 400 December 31, 2018 Gross Carrying Value Accumulated Amortization Net Carrying Value (in millions) Management and franchise contracts: Management and franchise contracts recorded at Merger (1) $ 2,228 $ (1,873 ) $ 355 Contract acquisition costs 525 (101 ) 424 Development commissions and other 108 (15 ) 93 $ 2,861 $ (1,989 ) $ 872 Other intangible assets: Leases (1) $ 288 $ (161 ) $ 127 Capitalized software costs 503 (321 ) 182 Hilton Honors (1) 338 (236 ) 102 Other (1) 38 (34 ) 4 $ 1,167 $ (752 ) $ 415 ____________ (1) Represents intangible assets that were initially recorded at their fair value as part of the October 24, 2007 transaction whereby we became a wholly owned subsidiary of affiliates of The Blackstone Group L.P (the "Merger").	Amortizing intangible assets were as follows: December 31, 2018 Gross Carrying Value Accumulated Amortization Net Carrying Value (in millions) Management and franchise contracts: Management and franchise contracts recorded at Merger (1) $ 2,228 $ (1,873 ) $ 355 Contract acquisition costs 525 (101 ) 424 Development commissions 108 (15 ) 93 $ 2,861 $ (1,989 ) $ 872 Other intangible assets: Leases (1) $ 288 $ (161 ) $ 127 Capitalized software costs 503 (321 ) 182 Hilton Honors (1) 338 (236 ) 102 Other (1) 38 (34 ) 4 $ 1,167 $ (752 ) $ 415 December 31, 2017 Gross Carrying Value Accumulated Amortization Net Carrying Value (in millions) Management and franchise contracts: Management and franchise contracts recorded at Merger (1) $ 2,242 $ (1,716 ) $ 526 Contract acquisition costs 416 (74 ) 342 Development commissions 97 (12 ) 85 $ 2,755 $ (1,802 ) $ 953 Other intangible assets: Leases (1) $ 301 $ (153 ) $ 148 Capitalized software costs 585 (428 ) 157 Hilton Honors (1) 341 (217 ) 124 Other (1) 38 (34 ) 4 $ 1,265 $ (832 ) $ 433 ____________ (1) Includes intangible assets that were initially recorded at their fair value at the time of the Merger.
Amortization of Amortizing Intangible Assets	Amortization of our amortizing intangible assets was as follows: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 (in millions) Recognized in depreciation and amortization expense (1) $ 71 $ 66 $ 141 $ 135 Recognized as a reduction of franchise and licensing fees and base and other management fees 7 7 14 14 ____________ (1) Includes amortization expense of $51 million and $52 million for the three months ended June 30, 2019 and 2018 , respectively, and $102 million and $103 million for the six months ended June 30, 2019 and 2018 , respectively, associated with assets that were initially recorded at their fair value at the time of the Merger.	Amortization of our amortizing intangible assets was as follows: Year Ended December 31, 2018 2017 2016 (in millions) Recognized in depreciation and amortization expense (1) $ 271 $ 277 $ 301 Recognized as a reduction of franchise and licensing fees and base and other management fees 27 17 16 ____________ (1) Includes amortization expense that was associated with assets recorded at their fair value at the time of the Merger of $204 million , $206 million and $208 million for the years ended December 31, 2018 , 2017 and 2016 , respectively, and amortization expense on capitalized software costs of $62 million , $67 million and $87 million , respectively.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	We estimate future amortization of our amortizing intangible assets as of June 30, 2019 to be as follows: Recognized in Depreciation and Amortization Expense Recognized as a Reduction of Franchise and Licensing Fees and Base and Other Management Fees Year (in millions) 2019 (remaining) $ 141 $ 13 2020 250 26 2021 110 25 2022 81 23 2023 51 23 Thereafter 144 330 $ 777 $ 440	We estimate future amortization of our amortizing intangible assets as of December 31, 2018 to be as follows: Recognized in Depreciation and Amortization Expense Recognized as a Reduction of Franchise and Licensing Fees and Base and Other Management Fees Year (in millions) 2019 $ 279 $ 27 2020 236 25 2021 97 24 2022 66 22 2023 48 22 Thereafter 137 304 $ 863 $ 424

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment [Table Text Block]	Property and equipment were as follows: December 31, 2018 2017 (in millions) Land $ 12 $ 12 Buildings and leasehold improvements (1) 456 428 Furniture and equipment 356 346 Construction-in-progress 24 17 848 803 Accumulated depreciation (1) (481 ) (450 ) $ 367 $ 353 ____________ (1) Buildings and leasehold improvements included $65 million and $68 million of capital lease assets as of December 31, 2018 and 2017 , respectively, with associated accumulated amortization of $45 million and $43 million , respectively.

Accounts Payable, Accrued Exp_2

Accounts Payable, Accrued Expenses and Other (Tables)	12 Months Ended
	Dec. 31, 2018
Payables and Accruals [Abstract]
Schedule of Accounts Payable and Accrued Liabilities	Accounts payable, accrued expenses and other were as follows: December 31, 2018 2017 (in millions) Accrued employee compensation and benefits $ 532 $ 502 Accounts payable 283 282 Insurance reserves, current 199 189 Other accrued expenses (1) 516 443 $ 1,530 $ 1,416 ____________ (1) Includes deposit liabilities related to hotel operations and application fees, taxes, interest and other accrued balances.

Debt (Tables)

Debt (Tables)	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Schedule of Debt	Long-term debt balances, including obligations for finance leases, and associated interest rates and maturities as of June 30, 2019 , were as follows: June 30, December 31, 2019 2018 (in millions) Senior secured term loan facility with a rate of 4.15%, due 2026 $ 2,619 $ 3,119 Senior notes with a rate of 4.250%, due 2024 1,000 1,000 Senior notes with a rate of 4.625%, due 2025 900 900 Senior notes with a rate of 5.125%, due 2026 1,500 1,500 Senior notes with a rate of 4.875%, due 2027 600 600 Senior notes with a rate of 4.875%, due 2030 1,000 — Finance lease liabilities with an average rate of 5.80%, due 2019 to 2030 260 225 Other debt with a rate of 3.08% due 2026 18 17 7,897 7,361 Less: unamortized deferred financing costs and discount (88 ) (79 ) Less: current maturities of long-term debt (1) (37 ) (16 ) $ 7,772 $ 7,266 ____________ (1) Represents current maturities of finance lease liabilities.	Long-term debt balances, including obligations for capital leases, and associated interest rates as of December 31, 2018 were as follows: December 31, 2018 2017 (in millions) Senior notes with a rate of 4.250%, due 2024 $ 1,000 $ 1,000 Senior notes with a rate of 4.625%, due 2025 900 900 Senior notes with a rate of 5.125%, due 2026 1,500 — Senior notes with a rate of 4.875%, due 2027 600 600 Senior secured term loan facility with a rate of 4.26%, due 2023 3,119 3,929 Capital lease obligations with an average rate of 6.43%, due 2021 to 2030 225 233 Other debt with an average rate of 3.08%, due 2026 17 21 7,361 6,683 Less: unamortized deferred financing costs and discount (79 ) (81 ) Less: current maturities of long-term debt (1) (16 ) (46 ) $ 7,266 $ 6,556 ____________ (1) Balance as of December 31, 2017 is net of unamortized deferred financing costs and discount attributable to current maturities of long-term debt.
Schedule of Maturities of Long-term Debt	The contractual maturities of our long-term debt as of June 30, 2019 were as follows: Year (in millions) 2019 (remaining) $ 19 2020 35 2021 28 2022 20 2023 21 Thereafter 7,774 $ 7,897	The contractual maturities of long-term debt as of December 31, 2018 , were as follows: Year (in millions) 2019 $ 16 2020 17 2021 18 2022 19 2023 3,139 Thereafter 4,152 $ 7,361

Other Liabilities (Tables)

Other Liabilities (Tables)	12 Months Ended
	Dec. 31, 2018
Other Liabilities Disclosure [Abstract]
Other Noncurrent Liabilities	Other long-term liabilities were as follows: December 31, 2018 2017 (in millions) Pension obligations $ 145 $ 165 Other long-term tax liabilities 395 397 Deferred employee compensation and benefits 113 117 Insurance reserves (1) 146 162 Other 64 79 $ 863 $ 920 ____________ (1) Obligations related to insurance claims are expected to be satisfied, on average, over the next three years .

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	The fair values of our derivative instruments in our consolidated balance sheets were as follows: December 31, Balance Sheet Classification 2018 2017 (in millions) Cash Flow Hedges: Interest rate swaps Other non-current assets $ 16 $ 11 Forward contracts Other current assets 1 — Forward contracts Accounts payable, accrued expenses and other — 1 Non-designated Hedges: Forward contracts Other current assets 1 4 Forward contracts Accounts payable, accrued expenses and other 2 1
Derivative Instruments, Gain (Loss) [Table Text Block]	The gains and losses recognized in our consolidated statements of operations and consolidated statements of comprehensive income before any effect for income taxes were as follows: Year Ended December 31, Classification of Gain (Loss) Recognized 2018 2017 2016 (in millions) Cash Flow Hedges (1)(2) : Interest rate swaps Other comprehensive income (loss) $ 22 $ (5 ) $ (15 ) Interest rate swaps Interest expense (1 ) (16 ) (8 ) Forward contracts Other comprehensive income (loss) 2 (1 ) N/A Non-designated Hedges: Interest rate swaps (3) Other non-operating income, net N/A 2 4 Interest rate swaps (3) Interest expense (5 ) (10 ) (4 ) Forward contracts Gain (loss) on foreign currency transactions (9 ) 12 7 ____________ (1) There were no amounts recognized in earnings related to hedge ineffectiveness or amounts excluded from hedge effectiveness testing during the years ended December 31, 2018 , 2017 and 2016 . (2) The earnings effect of the Fee Forward Contracts on fee revenues for the years ended December 31, 2018 and 2017 was less than $1 million. (3) These amounts relate to the interest rate swaps that we have dedesignated and settled. The amounts recognized in interest expense were reclassified from accumulated other comprehensive loss as the underlying transactions occurred.

Fair Value Estimates (Tables)

Fair Value Estimates (Tables)	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value, by Balance Sheet Grouping	The fair values of certain financial instruments and the hierarchy level we used to estimate the fair values are shown below; the fair values of financial instruments not included in these tables are estimated to be equal to their carrying values as of June 30, 2019 and December 31, 2018 : June 30, 2019 Hierarchy Level Carrying Value Level 1 Level 2 Level 3 (in millions) Assets: Cash equivalents $ 265 $ — $ 265 $ — Restricted cash equivalents 19 — 19 — Liabilities: Long-term debt (1) 7,531 5,149 — 2,624 Interest rate swaps 35 — 35 — December 31, 2018 Hierarchy Level Carrying Value Level 1 Level 2 Level 3 (in millions) Assets: Cash equivalents $ 87 $ — $ 87 $ — Restricted cash equivalents 18 — 18 — Interest rate swaps 16 — 16 — Liabilities: Long-term debt (1) 7,040 3,809 — 3,039 ____________ (1) The carrying values include unamortized deferred financing costs and discount. The carrying values and fair values exclude finance lease liabilities and other debt.	The fair values of certain financial instruments and the hierarchy level we used to estimate the fair values are shown below; see Note 11 : " Derivative Instruments and Hedging Activities " for the fair value information of our derivatives and Note 15 : " Employee Benefit Plans " for fair value information of our pension assets: December 31, 2018 Hierarchy Level Carrying Value Level 1 Level 2 Level 3 (in millions) Assets: Cash equivalents $ 87 $ — $ 87 $ — Restricted cash equivalents 18 — 18 — Liabilities: Long-term debt (1) 7,040 3,809 — 3,039 December 31, 2017 Hierarchy Level Carrying Value Level 1 Level 2 Level 3 (in millions) Assets: Cash equivalents $ 284 $ — $ 284 $ — Restricted cash equivalents 12 — 12 — Liabilities: Long-term debt (1) 6,348 2,575 — 3,954 ____________ (1) The carrying values include unamortized deferred financing costs and discount. The carrying values and fair values exclude capital lease obligations and other debt.

Leases (Tables)

Leases (Tables)	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Schedule of Future Minimum Rent Payments		The future minimum rent payments as of December 31, 2018 , were as follows: Operating Capital Year (in millions) 2019 $ 206 $ 30 2020 191 30 2021 166 30 2022 134 29 2023 119 29 Thereafter 865 164 Total minimum lease payments $ 1,681 312 Less: amount representing interest (87 ) Present value of minimum lease payments $ 225
Schedule of Rent Expense		Lease expense for operating leases was as follows: Year Ended December 31, 2018 2017 2016 (in millions) Fixed $ 225 $ 183 $ 224 Contingent 142 101 98 $ 367 $ 284 $ 322
Supplemental balance sheet information related to leases	Supplemental balance sheet information related to leases as of June 30, 2019 was as follows: (dollars in millions) Operating leases: Operating lease right-of-use assets $ 891 Accounts payable, accrued expenses and other 131 Operating lease liabilities 1,066 Finance leases: Property and equipment, net $ 57 Current maturities of long-term debt 37 Long-term debt 223 Weighted average remaining lease term: Operating leases 13.0 years Finance leases 8.9 years Weighted average discount rate: Operating leases 3.74 % Finance leases 5.80 %
Lease, Cost	The components of lease expense were as follows: Three Months Ended Six Months Ended June 30, 2019 June 30, 2019 (in millions) Operating lease expense for fixed payments $ 36 $ 73 Finance lease expense: Amortization of ROU assets 8 16 Interest on lease liabilities 3 7 Variable lease expense (1) 52 82 ____________ (1) Includes amounts related to operating leases and interest payments on finance leases.
Supplemental cash flow information related to leases	Supplemental cash flow information related to leases for the six months ended June 30, 2019 was as follows: (in millions) Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 90 Financing cash flows from finance leases 21 ROU assets obtained in exchange for lease liabilities in non-cash transactions: Operating leases 21 Finance leases 52
Schedule of Future Minimum Lease Payments	Our future minimum lease payments as of June 30, 2019 were as follows: Operating Finance Year (in millions) 2019 (remaining) $ 89 $ 26 2020 175 49 2021 161 40 2022 137 31 2023 122 30 Thereafter 872 166 Total minimum lease payments 1,556 342 Less: imputed interest (359 ) (82 ) Total lease liabilities $ 1,197 $ 260

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]	The domestic and foreign components of income from continuing operations before income taxes were as follows: Year Ended December 31, 2018 2017 2016 (in millions) U.S. income before tax $ 881 $ 632 $ 906 Foreign income (loss) before tax 197 121 (366 ) Income from continuing operations before income taxes $ 1,078 $ 753 $ 540
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	The components of our provision (benefit) for income taxes were as follows: Year Ended December 31, 2018 2017 2016 (in millions) Current: Federal $ 210 $ 239 $ 441 State 53 59 143 Foreign 60 95 70 Total current 323 393 654 Deferred: Federal (52 ) (667 ) (123 ) State (14 ) (35 ) 45 Foreign 52 (27 ) (19 ) Total deferred (14 ) (729 ) (97 ) Total provision (benefit) for income taxes $ 309 $ (336 ) $ 557
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Reconciliations of our tax provision at the U.S. statutory rate to the provision (benefit) for income taxes were as follows: Year Ended December 31, 2018 2017 2016 (in millions) Statutory U.S. federal income tax provision $ 226 $ 264 $ 189 State income taxes, net of U.S. federal tax benefit 37 19 22 Impact of foreign operations 26 4 34 Effects of the TCJ Act 13 (600 ) — Corporate restructuring 9 — 477 Change in deferred tax asset valuation allowance (6 ) (48 ) (20 ) Provision (benefit) for uncertain tax positions 16 38 (139 ) Other, net (12 ) (13 ) (6 ) Provision (benefit) for income taxes $ 309 $ (336 ) $ 557
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	The tax effects of the temporary differences and carryforwards that give rise to our net deferred taxes were as follows: December 31, 2018 2017 (in millions) Deferred tax assets: Net operating loss carryforwards $ 389 $ 395 Compensation 118 113 Reserves 18 39 Capital lease obligations 75 78 Deferred income 258 210 Other 42 52 Total gross deferred tax assets 900 887 Less: valuation allowance (399 ) (408 ) Deferred tax assets 501 479 Deferred tax liabilities: Brands (1,123 ) (1,122 ) Amortizing intangible assets (157 ) (177 ) Investment in foreign subsidiaries (29 ) — Deferred tax liabilities (1,309 ) (1,299 ) Net deferred taxes $ (808 ) $ (820 )
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]	Reconciliations of the beginning and ending amounts of unrecognized tax benefits were as follows: Year Ended December 31, 2018 2017 2016 (in millions) Balance at beginning of year $ 283 $ 174 $ 315 Additions for tax positions related to prior years 37 3 77 Additions for tax positions related to the current year 16 126 9 Reductions for tax positions related to prior years (15 ) (10 ) (204 ) Settlements — (9 ) (21 ) Lapse of statute of limitations (3 ) (2 ) (2 ) Currency translation adjustment — 1 — Balance at end of year $ 318 $ 283 $ 174

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block]	The following table presents the projected benefit obligation, fair value of plan assets, funded status and accumulated benefit obligation for the Domestic Plan, the U.K. Plan and the International Plans: Domestic Plan U.K. Plan International Plans 2018 2017 2018 2017 2018 2017 (in millions) Change in Projected Benefit Obligation: Benefit obligation at beginning of year $ 384 $ 381 $ 443 $ 404 $ 86 $ 81 Service cost — — 3 2 2 1 Interest cost 12 12 9 10 2 1 Prior service cost (1) — — 4 — — — Actuarial loss (gain) (14 ) 16 (39 ) 4 — 3 Settlements and curtailments (2 ) (1 ) — — (1 ) — Effect of foreign exchange rates — — (25 ) 40 (1 ) 4 Benefits paid (23 ) (24 ) (20 ) (17 ) (5 ) (4 ) Benefit obligation at end of year $ 357 $ 384 $ 375 $ 443 $ 83 $ 86 Change in Plan Assets: Fair value of plan assets at beginning of year $ 306 $ 267 $ 386 $ 336 $ 65 $ 58 Actual return on plan assets, net of expenses (23 ) 43 (14 ) 24 (1 ) 6 Employer contributions 16 21 10 9 4 4 Settlements (2 ) (1 ) — — — — Effect of foreign exchange rates — — (22 ) 34 — 1 Benefits paid (23 ) (24 ) (20 ) (17 ) (5 ) (4 ) Fair value of plan assets at end of year 274 306 340 386 63 65 Funded status at end of year (underfunded) (83 ) (78 ) (35 ) (57 ) (20 ) (21 ) Accumulated benefit obligation $ 357 $ 384 $ 375 $ 443 $ 83 $ 86 ____________ (1) Relates to U.K. pension equalization requirements.
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]	Amounts recognized in the consolidated balance sheets consisted of the following: Domestic Plan U.K. Plan International Plans 2018 2017 2018 2017 2018 2017 (in millions) Other non-current assets $ — $ — $ — $ — $ 7 $ 9 Other liabilities (83 ) (78 ) (35 ) (57 ) (27 ) (30 ) Net amount recognized $ (83 ) $ (78 ) $ (35 ) $ (57 ) $ (20 ) $ (21 )
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]	Amounts recognized in accumulated other comprehensive loss consisted of the following: Domestic Plan U.K. Plan International Plans 2018 2017 2016 2018 2017 2016 2018 2017 2016 (in millions) Net actuarial loss (gain) $ 22 $ (15 ) $ — $ (14 ) $ 13 $ 41 $ 3 $ — $ 3 Prior service cost (credit) (4 ) (3 ) (3 ) 4 — — — — — Amortization of net loss (3 ) (3 ) (3 ) (4 ) (4 ) (2 ) (1 ) — (1 ) Net amount recognized $ 15 $ (21 ) $ (6 ) $ (14 ) $ 9 $ 39 $ 2 $ — $ 2
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]	The estimated unrecognized prior service cost and net loss that will be amortized into net periodic pension cost (credit) during the year ended December 31, 2019 are as follows: Domestic Plan U.K. Plan International Plans (in millions) Unrecognized prior service cost (1) $ 3 $ — $ — Unrecognized net loss (1) 3 4 — Amount unrecognized $ 6 $ 4 $ — ____________ (1) Unrecognized prior service cost amounts for the U.K. Plan and International Plans are less than $1 million and unrecognized net loss amounts for the International Plans are less than $1 million.
Schedule of Net Benefit Costs [Table Text Block]	The net periodic pension cost (credit) was as follows: Domestic Plan U.K. Plan International Plans 2018 2017 2016 2018 2017 2016 2018 2017 2016 (in millions) Service cost $ 6 $ 8 $ 8 $ 3 $ 2 $ 2 $ 2 $ 2 $ 3 Interest cost 12 12 13 9 10 12 2 2 2 Expected return on plan assets (19 ) (19 ) (19 ) (21 ) (19 ) (22 ) (3 ) (3 ) (3 ) Amortization of prior service cost 3 3 4 — — — — — — Amortization of net loss 3 3 3 4 4 2 1 — — Net periodic pension cost (credit) $ 5 $ 7 $ 9 $ (5 ) $ (3 ) $ (6 ) $ 2 $ 1 $ 2
Schedule of Assumptions Used [Table Text Block]	The weighted-average assumptions used to determine benefit obligations were as follows: Domestic Plan U.K. Plan International Plans 2018 2017 2018 2017 2018 2017 Discount rate 4.3 % 3.6 % 3.1 % 2.6 % 3.3 % 2.4 % Salary inflation N/A N/A 1.8 1.8 2.2 2.2 Pension inflation N/A N/A 3.0 3.0 1.8 1.8 The weighted-average assumptions used to determine net periodic pension cost (credit) were as follows: Domestic Plan U.K. Plan International Plans 2018 2017 2016 2018 2017 2016 2018 2017 2016 Discount rate 3.6 % 4.0 % 4.2 % 2.6 % 2.8 % 3.9 % 2.9 % 3.0 % 3.5 % Expected return on plan assets 7.0 7.0 7.3 5.5 5.5 6.5 4.6 4.3 5.4 Salary inflation N/A N/A N/A 1.8 1.9 1.7 2.2 2.1 2.1 Pension inflation N/A N/A N/A 3.0 3.1 2.8 1.8 1.7 1.6
Schedule of Allocation of Plan Assets [Table Text Block]	The following tables present the fair value hierarchy of total plan assets measured at fair value by asset category: December 31, 2018 Domestic Plan U.K. Plan International Plans (in millions) Level 1 Cash and cash equivalents $ — $ 34 $ 11 Equity funds — 33 2 Bond funds — 39 — Alternative investments — 140 — Level 2 Equity funds — — 4 Bond funds — — 6 Net asset value (1) Bond funds — 44 — Common collective trusts 274 — 40 Other — 50 — $ 274 $ 340 $ 63 December 31, 2017 Domestic Plan U.K. Plan International Plans (in millions) Level 1 Cash and cash equivalents $ — $ — $ 11 Level 2 Equity funds — — 6 Bond funds — — 5 Net asset value (1) Common collective trusts 306 386 43 $ 306 $ 386 $ 65 ____________ (1) Certain investments are measured at net asset value per share as a practical expedient and, therefore, have not been classified in the fair value hierarchy.
Schedule of Expected Benefit Payments [Table Text Block]	As of December 31, 2018 , the benefits expected to be paid in the next five years and in the aggregate for the five years thereafter were as follows: Domestic Plan U.K. Plan International Plans Year (in millions) 2019 $ 35 $ 19 $ 11 2020 27 19 6 2021 27 20 5 2022 26 20 5 2023 26 20 5 2024-2028 121 107 24 $ 262 $ 205 $ 56

Share-Based Compensation (Table

Share-Based Compensation (Tables)	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule Of Additional Information On Restricted Stock Units [Table Text Block]		The following table provides information about our RSU grants for the last three fiscal years: Year Ended December 31, 2018 2017 2016 (in millions, except per share data) Number of shares granted 0.9 1.5 1.2 Weighted average grant date fair value per share $ 79.31 $ 58.80 $ 59.73 Aggregate intrinsic value of shares vested $ 123 $ 78 $ 40
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]		The following table summarizes the activity of our RSUs during the year ended December 31, 2018 : Number of Shares Weighted Average Grant Date Fair Value per Share (in millions) Outstanding as of December 31, 2017 2.8 $ 51.44 Granted 0.9 79.31 Vested (1.5 ) 49.56 Forfeited (0.2 ) 56.09 Outstanding as of December 31, 2018 2.0 64.88
Schedule of Additional Information on Stock Options [Table Text Block]		The following table provides information about our option grants for the last three fiscal years: Year Ended December 31, 2018 2017 2016 (in millions, except per share data) Number of options granted 0.6 0.7 0.5 Weighted average exercise price per share $ 79.36 $ 58.40 $ 58.83 Weighted average grant date fair value per share $ 23.72 $ 13.96 $ 16.41
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	The weighted average grant date fair value per share of the options granted during the six months ended June 30, 2019 was $21.08 , which was determined using the Black-Scholes-Merton option-pricing model with the following assumptions: Expected volatility (1) 23.51 % Dividend yield (2) 0.81 % Risk-free rate (3) 2.47 % Expected term (in years) (4) 6.0 ____________ (1) Estimated using historical movement of Hilton's stock price. (2) Estimated based on the quarterly dividend and the three-month average stock price at the date of grant. (3) Based on the yields of U.S. Department of Treasury instruments with similar expected lives. (4) Estimated using the average of the vesting periods and the contractual term of the options.	The weighted average grant date fair value per share of each of these option grants was determined using the Black-Scholes-Merton option-pricing model with the following assumptions: Year Ended December 31, 2018 2017 2016 Expected volatility (1) 27.91 % 24.00 % 32.00 % Dividend yield (2) 0.74 % 0.92% - 1.03% 1.43 % Risk-free rate (3) 2.73 % 1.93% - 2.03% 1.36 % Expected term (in years) (4) 6.0 6.0 6.0 ____________ (1) Estimated using historical movement of Hilton's stock price. (2) For the year ended December 31, 2018, estimated based on the quarterly dividend and the three-month average stock price at the grant date; for the years ended December 31, 2017 and 2016, estimated based on the expected annualized dividend payment at the grant date. (3) Based on the yields of U.S. Department of Treasury instruments with similar expected lives. (4) Estimated using the average of the vesting periods and the contractual term of the options.
Share-based Compensation, Stock Options, Activity [Table Text Block]		The following table summarizes the activity of our options during the year ended December 31, 2018 : Number of Shares Weighted Average Exercise Price per Share (in millions) Outstanding as of December 31, 2017 2.0 $ 51.24 Granted 0.6 79.36 Exercised (0.2 ) 50.15 Outstanding as of December 31, 2018 (1) 2.4 58.50 Exercisable as of December 31, 2018 (2) 1.1 50.07 ____________ (1) The aggregate intrinsic value was $36 million and the weighted average remaining contractual term was 8 years. (2) The aggregate intrinsic value was $25 million and the weighted average remaining contractual term was 7 years.
Performance Shares Achievement Percentages [Table Text Block]		We determined that the performance conditions for performance shares issued in 2018 and 2017 are probable of achievement and, as of December 31, 2018 , we recognized compensation expense related to these awards based on the following anticipated achievement percentages: EBITDA CAGR FCF CAGR 2017 performance shares 200 % 200 % 2018 performance shares 150 % 150 %
Schedule of Additional Information on Performance Shares [Table Text Block]		The following table provides information about our performance share grants for the last three fiscal years: Year Ended December 31, 2018 2017 2016 (in millions, except per share data) EBITDA CAGR: Number of shares granted 0.2 0.2 0.3 Weighted average grant date fair value per share $ 79.36 $ 58.40 $ 58.83 Aggregate intrinsic value of shares vested $ — $ — $ 12 FCF CAGR: Number of shares granted 0.2 0.2 N/A Weighted average grant date fair value per share $ 79.36 $ 58.40 N/A Aggregate intrinsic value of shares vested $ — $ — N/A Relative Shareholder Return: Number of shares granted N/A N/A 0.3 Weighted average grant date fair value per share N/A N/A $ 62.43 Aggregate intrinsic value of shares vested N/A N/A $ 16
Schedule of Nonvested Performance-based Units Activity [Table Text Block]		The following table summarizes the activity of our performance shares during the year ended December 31, 2018 : EBITDA CAGR FCF CAGR Number of Shares Weighted Average Grant Date Fair Value per Share Number of Shares Weighted Average Grant Date Fair Value per Share (in millions) (in millions) Outstanding as of December 31, 2017 0.2 $ 58.41 0.2 $ 58.41 Granted 0.2 79.36 0.2 79.36 Outstanding as of December 31, 2018 0.4 69.53 0.4 69.53

Earnings per Share (Tables)

Earnings per Share (Tables)	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The following table presents the calculation of basic and diluted earnings per share ("EPS"): Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 (in millions, except per share amounts) Basic EPS: Numerator: Net income attributable to Hilton stockholders $ 260 $ 217 $ 418 $ 378 Denominator: Weighted average shares outstanding 290 301 291 308 Basic EPS $ 0.90 $ 0.72 $ 1.43 $ 1.22 Diluted EPS: Numerator: Net income attributable to Hilton stockholders $ 260 $ 217 $ 418 $ 378 Denominator: Weighted average shares outstanding 292 303 294 311 Diluted EPS $ 0.89 $ 0.71 $ 1.42 $ 1.21	The following table presents the calculation of basic and diluted earnings (loss) per share ("EPS"). Year Ended December 31, 2018 2017 2016 (in millions, except per share amounts) Basic EPS: Numerator: Net income (loss) from continuing operations attributable to Hilton stockholders $ 764 $ 1,084 $ (27 ) Denominator: Weighted average shares outstanding 302 324 329 Basic EPS $ 2.53 $ 3.34 $ (0.08 ) Diluted EPS: Numerator: Net income (loss) from continuing operations attributable to Hilton stockholders $ 764 $ 1,084 $ (27 ) Denominator: Weighted average shares outstanding 305 327 329 Diluted EPS $ 2.50 $ 3.32 $ (0.08 )

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Equity [Abstract]
Schedule of Stockholders Equity [Table Text Block]	The following tables present the changes in the components of stockholders' equity (deficit) for the three and six months ended June 30, 2019 and 2018 : Three Months Ended June 30, 2019 Equity (Deficit) Attributable to Hilton Stockholders Treasury Stock Additional Accumulated Deficit Accumulated Other Comprehensive Loss Common Stock Noncontrolling Shares Amount Total (in millions) Balance as of March 31, 2019 292 $ 3 $ (2,921 ) $ 10,374 $ (6,558 ) $ (798 ) $ 8 $ 108 Net income — — — — 260 — 1 261 Other comprehensive loss — — — — — (8 ) — (8 ) Dividends — — — — (44 ) — — (44 ) Repurchases of common stock (4 ) — (383 ) — — — — (383 ) Share-based compensation — — — 45 — — — 45 Deconsolidation of a VIE — — — — — — (2 ) (2 ) Balance as of June 30, 2019 288 $ 3 $ (3,304 ) $ 10,419 $ (6,342 ) $ (806 ) $ 7 $ (23 ) Three Months Ended June 30, 2018 Equity (Deficit) Attributable to Hilton Stockholders Treasury Stock Additional Accumulated Deficit Accumulated Other Comprehensive Loss Common Stock Noncontrolling Interests Shares Amount Total (in millions) Balance as of March 31, 2018 317 $ 3 $ (1,001 ) $ 10,288 $ (6,868 ) $ (680 ) $ 5 $ 1,747 Net income — — — — 217 — — 217 Other comprehensive loss — — — — — (62 ) — (62 ) Dividends — — — — (46 ) — — (46 ) Repurchases of common stock (19 ) — (1,329 ) — — — — (1,329 ) Share-based compensation — — — 33 — — — 33 Balance as of June 30, 2018 298 $ 3 $ (2,330 ) $ 10,321 $ (6,697 ) $ (742 ) $ 5 $ 560 Six Months Ended June 30, 2019 Equity (Deficit) Attributable to Hilton Stockholders Treasury Stock Additional Accumulated Deficit Accumulated Other Comprehensive Loss Common Stock Noncontrolling Shares Amount Total (in millions) Balance as of December 31, 2018 295 $ 3 $ (2,625 ) $ 10,372 $ (6,417 ) $ (782 ) $ 7 $ 558 Net income — — — — 418 — 2 420 Other comprehensive loss — — — — — (24 ) — (24 ) Dividends — — — — (87 ) — — (87 ) Repurchases of common stock (8 ) — (679 ) — — — — (679 ) Share-based compensation 1 — — 47 — — — 47 Cumulative effect of the adoption of ASU 2016-02 — — — — (256 ) — — (256 ) Deconsolidation of a VIE — — — — — — (2 ) (2 ) Balance as of June 30, 2019 288 $ 3 $ (3,304 ) $ 10,419 $ (6,342 ) $ (806 ) $ 7 $ (23 ) Six Months Ended June 30, 2018 Equity (Deficit) Attributable to Hilton Stockholders Treasury Stock Additional Accumulated Deficit Accumulated Other Comprehensive Loss Common Stock Noncontrolling Interests Shares Amount Total (in millions) Balance as of December 31, 2017 317 $ 3 $ (891 ) $ 10,298 $ (6,981 ) $ (741 ) $ 3 $ 1,691 Net income — — — — 378 — 2 380 Other comprehensive loss — — — — — (1 ) — (1 ) Dividends — — — — (94 ) — — (94 ) Repurchases of common stock (20 ) — (1,439 ) — — — — (1,439 ) Share-based compensation 1 — — 23 — — — 23 Balance as of June 30, 2018 298 $ 3 $ (2,330 ) $ 10,321 $ (6,697 ) $ (742 ) $ 5 $ 560
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The changes in the components of accumulated other comprehensive loss, net of taxes, were as follows: Currency Translation Adjustment (1) Pension Liability Adjustment Cash Flow Hedge Adjustment Total (in millions) Balance as of December 31, 2018 $ (545 ) $ (260 ) $ 23 $ (782 ) Other comprehensive income (loss) before reclassifications 11 — (35 ) (24 ) Amounts reclassified from accumulated other comprehensive loss 1 4 (5 ) — Net current period other comprehensive income (loss) 12 4 (40 ) (24 ) Balance as of June 30, 2019 $ (533 ) $ (256 ) $ (17 ) $ (806 ) Currency Translation Adjustment (1) Pension Liability Adjustment Cash Flow Hedge Adjustment Total (in millions) Balance as of December 31, 2017 $ (513 ) $ (229 ) $ 1 $ (741 ) Other comprehensive income (loss) before reclassifications (45 ) — 36 (9 ) Amounts reclassified from accumulated other comprehensive loss — 3 5 8 Net current period other comprehensive income (loss) (45 ) 3 41 (1 ) Balance as of June 30, 2018 $ (558 ) $ (226 ) $ 42 $ (742 ) ____________ (1) Includes net investment hedges and intra-entity foreign currency transactions that are of a long-term investment nature.	The components of accumulated other comprehensive loss, net of taxes, were as follows: Currency Translation Adjustment (1) Pension Liability Adjustment Cash Flow Hedge Adjustment Total (in millions) Balance as of December 31, 2015 $ (580 ) $ (194 ) $ (10 ) $ (784 ) Other comprehensive loss before reclassifications (157 ) (63 ) (9 ) (229 ) Amounts reclassified from accumulated other comprehensive loss (1 ) 6 7 12 Net current period other comprehensive loss (158 ) (57 ) (2 ) (217 ) Balance as of December 31, 2016 (738 ) (251 ) (12 ) (1,001 ) Other comprehensive income (loss) before reclassifications 161 15 (4 ) 172 Amounts reclassified from accumulated other comprehensive loss 1 7 17 25 Net current period other comprehensive income 162 22 13 197 Spin-offs of Park and HGV 63 — — 63 Balance as of December 31, 2017 (513 ) (229 ) 1 (741 ) Other comprehensive income (loss) before reclassifications (70 ) (18 ) 17 (71 ) Amounts reclassified from accumulated other comprehensive loss — 9 5 14 Net current period other comprehensive income (loss) (70 ) (9 ) 22 (57 ) Cumulative effect of the adoption of ASU 2018-02 38 (22 ) — 16 Balance as of December 31, 2018 $ (545 ) $ (260 ) $ 23 $ (782 ) ____________ (1) Includes net investment hedges and intra-entity foreign currency transactions that are of a long-term investment nature.
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]	The following table presents additional information about reclassifications out of accumulated other comprehensive loss; amounts in parentheses indicate a loss in our condensed consolidated statements of operations: Three Months Ended Six Months Ended June 30, 2019 June 30, 2019 (in millions) Currency translation adjustment: Liquidation of investment in a foreign entity (1) $ (1 ) $ (1 ) Total currency translation adjustment reclassifications for the period, net of taxes (1 ) (1 ) Pension liability adjustment: Amortization of prior service cost (3) (1 ) (2 ) Amortization of net loss (3) (1 ) (3 ) Tax benefit (2) — 1 Total pension liability adjustment reclassifications for the period, net of taxes (2 ) (4 ) Cash flow hedge adjustment: Dedesignated interest rate swaps (4) 3 6 Tax expense (2) — (1 ) Total cash flow hedge adjustment reclassifications for the period, net of taxes 3 5 Total reclassifications for the period, net of taxes $ — $ — ____________ (1) Includes a gain on the related net investment hedge. Reclassified to loss on foreign currency transactions in our condensed consolidated statements of operations. The related tax benefit reclassified to income tax expense in our condensed consolidated statements of operations was less than $1 million . (2) Reclassified to income tax expense in our condensed consolidated statements of operations. (3) Reclassified to other non-operating income (loss), net in our condensed consolidated statements of operations. (4) Reclassified to interest expense in our condensed consolidated statements of operations.	The following table presents additional information about reclassifications out of accumulated other comprehensive loss (amounts in parentheses indicate a loss in our consolidated statements of operations): Year Ended December 31, 2018 2017 2016 (in millions) Currency translation adjustment: Sale or liquidation of investment in foreign entity (1) $ — $ (2 ) $ — Gains on net investment hedges (1) — 1 1 Total currency translation adjustment reclassifications for the period, net of taxes — (1 ) 1 Pension liability adjustment: Amortization of prior service cost (2) (3 ) (3 ) (4 ) Amortization of net loss (2) (8 ) (7 ) (5 ) Tax benefit (3) 2 3 3 Total pension liability adjustment reclassifications for the period, net of taxes (9 ) (7 ) (6 ) Cash flow hedge adjustment: Dedesignated interest rate swaps (4) (6 ) (26 ) (12 ) Tax benefit (3) 1 9 5 Total cash flow hedge adjustment reclassifications for the period, net of taxes (5 ) (17 ) (7 ) Total reclassifications for the period, net of taxes $ (14 ) $ (25 ) $ (12 ) ____________ (1) Reclassified out of accumulated other comprehensive loss to gain (loss) on foreign currency transactions in our consolidated statements of operations. The related tax benefits for the years ended December 31, 2017 and 2016 were less than $1 million and were reclassified out of accumulated other comprehensive loss to income tax benefit (expense) in our consolidated statements of operations. (2) Reclassified out of accumulated other comprehensive loss to other non-operating income, net in our consolidated statements of operations. These amounts were included in the computation of net periodic pension cost (credit). See Note 15 : " Employee Benefit Plans " for additional information. (3) Reclassified out of accumulated other comprehensive loss to income tax benefit (expense) in our consolidated statements of operations. (4) Reclassified out of accumulated other comprehensive loss to interest expense in our consolidated statements of operations. See Note 11 : " Derivative Instruments and Hedging Activities " for additional information.

Business Segments (Tables)

Business Segments (Tables)	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Segment Reporting [Abstract]
Reconciliation of Revenue from Segments to Consolidated	The following table presents revenues for our reportable segments, reconciled to consolidated amounts: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 (in millions) Franchise and licensing fees $ 445 $ 405 $ 830 $ 738 Base and other management fees (1) 106 101 198 191 Incentive management fees 58 59 113 114 Management and franchise 609 565 1,141 1,043 Ownership 387 392 699 726 Segment revenues 996 957 1,840 1,769 Amortization of contract acquisition costs (7 ) (7 ) (14 ) (14 ) Other revenues 26 22 52 45 Direct reimbursements from managed and franchised properties (2) 789 730 1,564 1,429 Indirect reimbursements from managed and franchised properties (2) 691 600 1,265 1,155 Intersegment fees elimination (1) (11 ) (11 ) (19 ) (19 ) Total revenues $ 2,484 $ 2,291 $ 4,688 $ 4,365 ____________ (1) Includes management, royalty and IP fees charged to our ownership segment by our management and franchise segment, which were eliminated in our condensed consolidated statements of operations. (2) Included in other revenues from managed and franchised properties in our condensed consolidated statements of operations.	The following table presents revenues for our reportable segments, reconciled to consolidated amounts: Year Ended December 31, 2018 2017 2016 (in millions) Franchise and licensing fees $ 1,537 $ 1,326 $ 1,095 Base and other management fees(1) 385 379 284 Incentive management fees 235 222 142 Management and franchise 2,157 1,927 1,521 Ownership 1,484 1,432 1,434 Segment revenues 3,641 3,359 2,955 Amortization of contract acquisition costs (27 ) (17 ) (16 ) Other revenues 98 105 82 Direct reimbursements from managed and franchised properties (2) 2,881 2,572 1,644 Indirect reimbursements from managed and franchised properties (2) 2,357 2,155 1,953 Intersegment fees elimination (1) (44 ) (43 ) (42 ) Total revenues $ 8,906 $ 8,131 $ 6,576 ____________ (1) Includes management, royalty and IP fees charged to our ownership segment by our management and franchise segment, which were eliminated in our consolidated statements of operations. (2) Included in other revenues from managed and franchised properties in our consolidated statements of operations.
Reconciliation of Operating Profit (Loss) from Segments to Consolidated	The following table presents operating income for our reportable segments, reconciled to consolidated income before income taxes: Three Months Ended Six Months Ended June 30, June 30, 2019 2018 2019 2018 (in millions) Management and franchise (1) $ 609 $ 565 $ 1,141 $ 1,043 Ownership (1) 42 29 48 35 Segment operating income 651 594 1,189 1,078 Amortization of contract acquisition costs (7 ) (7 ) (14 ) (14 ) Other revenues, less other expenses 11 10 17 19 Net other revenues (expenses) from managed and franchised properties 22 3 (12 ) (18 ) Depreciation and amortization (86 ) (79 ) (170 ) (161 ) General and administrative (113 ) (115 ) (220 ) (219 ) Operating income 478 406 790 685 Interest expense (101 ) (95 ) (199 ) (178 ) Loss on foreign currency transactions (3 ) (12 ) (3 ) (1 ) Other non-operating income (loss), net (12 ) (1 ) (8 ) 13 Income before income taxes $ 362 $ 298 $ 580 $ 519 ____________ (1) Includes management, royalty and IP fees charged to our ownership segment by our management and franchise segment, which were eliminated in our condensed consolidated statements of operations.	The following table presents operating income for our reportable segments, reconciled to consolidated income from continuing operations before income taxes: Year Ended December 31, 2018 2017 2016 (in millions) Management and franchise (1) $ 2,157 $ 1,927 $ 1,521 Ownership (1) 108 120 113 Segment operating income 2,265 2,047 1,634 Amortization of contract acquisition costs (27 ) (17 ) (16 ) Other revenues, less other expenses 47 49 16 Net other expenses from managed and franchised properties (85 ) (172 ) (12 ) Depreciation and amortization (325 ) (336 ) (353 ) General and administrative (443 ) (439 ) (409 ) Gain on sales of assets, net — — 8 Operating income 1,432 1,132 868 Interest expense (371 ) (351 ) (334 ) Gain (loss) on foreign currency transactions (11 ) 3 (16 ) Loss on debt extinguishment — (60 ) — Other non-operating income, net 28 29 22 Income from continuing operations before income taxes $ 1,078 $ 753 $ 540 ____________ (1) Includes management, royalty and IP fees charged to our ownership segment by our management and franchise segment, which were eliminated in our consolidated statements of operations.
Reconciliation of Assets from Segment to Consolidated	The following table presents total assets for our reportable segments, reconciled to consolidated amounts: June 30, December 31, 2019 2018 (in millions) Management and franchise $ 11,399 $ 11,362 Ownership 1,731 927 Corporate and other 2,010 1,706 $ 15,140 $ 13,995	The following table presents total assets for our reportable segments, reconciled to consolidated amounts: December 31, 2018 2017 (in millions) Management and franchise $ 11,362 $ 11,505 Ownership 927 964 Corporate and other 1,706 1,759 $ 13,995 $ 14,228
Reconciliation of Capital Expenditures for Property and Equipment from Segment to Consolidated	The following table presents capital expenditures for property and equipment for our reportable segments, reconciled to consolidated amounts: Six Months Ended June 30, 2019 2018 (in millions) Ownership $ 25 $ 19 Corporate and other 21 9 $ 46 $ 28	The following table presents capital expenditures for property and equipment for our reportable segments, reconciled to consolidated capital expenditures of continuing operations: Year Ended December 31, 2018 2017 2016 (in millions) Ownership $ 42 $ 32 $ 45 Corporate and other 30 26 17 $ 72 $ 58 $ 62
Revenue from External Customers by Geographic Areas		Total revenues by country were as follows: Year Ended December 31, 2018 2017 2016 (in millions) U.S. $ 6,848 $ 6,046 $ 4,524 United Kingdom 545 544 942 All other 1,513 1,541 1,110 $ 8,906 $ 8,131 $ 6,576
Long-lived Assets by Geographic Areas		Property and equipment, net by country was as follows: December 31, 2018 2017 (in millions) U.S. $ 109 $ 105 Japan 106 94 United Kingdom 75 82 Germany 40 36 All other 37 36 $ 367 $ 353

Condensed Consolidated Guaran_2

Condensed Consolidated Guarantor Information (Tables)	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Condensed Financial Statements [Text Block]	Condensed Consolidating Guarantor Financial Information Hilton Worldwide Finance LLC and Hilton Worldwide Finance Corp. (together, the "HWF Issuers"), which are 100 percent owned by Hilton Worldwide Parent LLC ("HWP"), which is 100 percent owned by the Parent, issued the 2025 Senior Notes and the 2027 Senior Notes. Hilton Domestic Operating Company Inc. ("HOC"), which is 100 percent owned by Hilton Worldwide Finance LLC, assumed the 2024 Senior Notes, issued the 2026 Senior Notes and, in June 2019, issued the 2030 Senior Notes. The 2024 Senior Notes, 2025 Senior Notes, 2026 Senior Notes, 2027 Senior Notes and 2030 Senior Notes are collectively referred to as the Senior Notes. The HWF Issuers and HOC are collectively referred to as the Subsidiary Issuers. The Senior Notes are guaranteed jointly and severally on a senior unsecured basis by HWP, the Parent and certain of the Parent's wholly owned domestic restricted subsidiaries that are themselves not issuers of the applicable series of Senior Notes (together, the "Guarantors''). The indentures that govern the Senior Notes provide that any subsidiary of the Company that provides a guarantee of our senior secured credit facilities will guarantee the Senior Notes. Additionally, the HWF Issuers are guarantors of the 2024 Senior Notes, the 2026 Senior Notes and the 2030 Senior Notes and HOC is a guarantor of the 2025 Senior Notes and the 2027 Senior Notes. As of June 30, 2019 , none of our foreign subsidiaries or U.S. subsidiaries owned by foreign subsidiaries or conducting foreign operations or our non-wholly owned subsidiaries guarantee the Senior Notes (collectively, the "Non-Guarantors"). The guarantees are full and unconditional, subject to certain customary release provisions. The indentures that govern the Senior Notes provide that any Guarantor may be released from its guarantee so long as: (i) the subsidiary is sold or sells all of its assets; (ii) the subsidiary is released from its guaranty under our senior secured credit facilities; (iii) the subsidiary is declared "unrestricted" for covenant purposes; (iv) the subsidiary is merged with or into the applicable Subsidiary Issuers or another Guarantor or the Guarantor liquidates after transferring all of its assets to the applicable Subsidiary Issuers or another Guarantor; or (v) the requirements for legal defeasance or covenant defeasance or to discharge the indenture have been satisfied, in each case in compliance with applicable provisions of the indentures. The following tables present the condensed consolidating financial information as of June 30, 2019 and December 31, 2018 , and for the three and six months ended June 30, 2019 and 2018 , for the Parent, HWF Issuers, HOC, Guarantors and Non-Guarantors. The condensed consolidating financial information presents the financial information for all periods based on the composition of the Guarantors and Non-Guarantors as of June 30, 2019 . June 30, 2019 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) ASSETS Current Assets: Cash and cash equivalents $ — $ — $ 3 $ 23 $ 609 $ — $ 635 Restricted cash and cash equivalents — — 34 16 33 — 83 Accounts receivable, net — — 14 852 324 — 1,190 Intercompany receivables — — — — 40 (40 ) — Prepaid expenses — — 16 48 55 (2 ) 117 Other — 1 1 48 147 (7 ) 190 Total current assets — 1 68 987 1,208 (49 ) 2,215 Intangibles and Other Assets: Investments in subsidiaries 2 4,113 7,850 2 — (11,967 ) — Goodwill — — — 3,824 1,333 — 5,157 Brands — — — 4,405 469 — 4,874 Management and franchise contracts, net — — 1 502 314 — 817 Other intangible assets, net — — — 279 121 — 400 Operating lease right-of-use assets — — 36 10 845 — 891 Property and equipment, net — — 61 67 290 — 418 Deferred income tax assets 4 7 86 — 146 (97 ) 146 Other — 12 31 17 162 — 222 Total intangibles and other assets 6 4,132 8,065 9,106 3,680 (12,064 ) 12,925 TOTAL ASSETS $ 6 $ 4,133 $ 8,133 $ 10,093 $ 4,888 $ (12,113 ) $ 15,140 LIABILITIES AND EQUITY (DEFICIT) Current Liabilities: Accounts payable, accrued expenses and other $ 36 $ 20 $ 201 $ 664 $ 743 $ (7 ) $ 1,657 Current maturities of long-term debt — — 20 — 17 — 37 Current portion of deferred revenues — — 47 241 12 (2 ) 298 Intercompany payables — — 40 — — (40 ) — Current portion of liability for guest loyalty program — — — 788 — — 788 Total current liabilities 36 20 308 1,693 772 (49 ) 2,780 Long-term debt — 4,076 3,473 — 223 — 7,772 Operating lease liabilities — — 43 8 1,015 — 1,066 Deferred revenues — — — 754 68 — 822 Deferred income tax liabilities — — — 958 — (97 ) 861 Liability for guest loyalty program — — — 986 — — 986 Other — 35 196 94 551 — 876 Total liabilities 36 4,131 4,020 4,493 2,629 (146 ) 15,163 Equity (Deficit): Total Hilton stockholders' equity (deficit) (30 ) 2 4,113 5,600 2,252 (11,967 ) (30 ) Noncontrolling interests — — — — 7 — 7 Total equity (deficit) (30 ) 2 4,113 5,600 2,259 (11,967 ) (23 ) TOTAL LIABILITIES AND EQUITY (DEFICIT) $ 6 $ 4,133 $ 8,133 $ 10,093 $ 4,888 $ (12,113 ) $ 15,140 December 31, 2018 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) ASSETS Current Assets: Cash and cash equivalents $ — $ — $ 3 $ 17 $ 383 $ — $ 403 Restricted cash and cash equivalents — — 34 15 32 — 81 Accounts receivable, net — — 10 735 405 — 1,150 Intercompany receivables — — — — 40 (40 ) — Prepaid expenses — — 52 37 80 (9 ) 160 Other — 1 1 36 154 (3 ) 189 Total current assets — 1 100 840 1,094 (52 ) 1,983 Intangibles and Other Assets: Investments in subsidiaries 557 5,131 7,930 557 — (14,175 ) — Goodwill — — — 3,824 1,336 — 5,160 Brands — — — 4,404 465 — 4,869 Management and franchise contracts, net — — — 556 316 — 872 Other intangible assets, net — — — 287 128 — 415 Property and equipment, net — — 27 65 275 — 367 Deferred income tax assets 4 — 94 — 90 (98 ) 90 Other — 23 33 22 161 — 239 Total intangibles and other assets 561 5,154 8,084 9,715 2,771 (14,273 ) 12,012 TOTAL ASSETS $ 561 $ 5,155 $ 8,184 $ 10,555 $ 3,865 $ (14,325 ) $ 13,995 LIABILITIES AND EQUITY Current Liabilities: Accounts payable, accrued expenses and other $ 10 $ 19 $ 229 $ 529 $ 765 $ (3 ) $ 1,549 Current maturities of long-term debt — — — — 16 — 16 Current portion of deferred revenues — — 106 239 14 (9 ) 350 Intercompany payables — — 40 — — (40 ) — Current portion of liability for guest loyalty program — — — 700 — — 700 Total current liabilities 10 19 375 1,468 795 (52 ) 2,615 Long-term debt — 4,573 2,467 — 226 — 7,266 Deferred revenues — — — 762 64 — 826 Deferred income tax liabilities — 6 — 962 28 (98 ) 898 Liability for guest loyalty program — — — 969 — — 969 Other — — 211 93 559 — 863 Total liabilities 10 4,598 3,053 4,254 1,672 (150 ) 13,437 Equity: Total Hilton stockholders' equity 551 557 5,131 6,301 2,186 (14,175 ) 551 Noncontrolling interests — — — — 7 — 7 Total equity 551 557 5,131 6,301 2,193 (14,175 ) 558 TOTAL LIABILITIES AND EQUITY $ 561 $ 5,155 $ 8,184 $ 10,555 $ 3,865 $ (14,325 ) $ 13,995 Three Months Ended June 30, 2019 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Revenues Franchise and licensing fees $ — $ — $ 69 $ 338 $ 41 $ (4 ) $ 444 Base and other management fees — — — 57 32 — 89 Incentive management fees — — — 21 37 — 58 Owned and leased hotels — — — — 387 — 387 Other revenues — — 1 20 5 — 26 — — 70 436 502 (4 ) 1,004 Other revenues from managed and franchised properties — — 81 1,247 152 — 1,480 Total revenues — — 151 1,683 654 (4 ) 2,484 Expenses Owned and leased hotels — — — — 334 — 334 Depreciation and amortization — — 1 63 22 — 86 General and administrative — — 89 — 31 (7 ) 113 Other expenses — — 3 2 7 3 15 — — 93 65 394 (4 ) 548 Other expenses from managed and franchised properties — — 87 1,224 147 — 1,458 Total expenses — — 180 1,289 541 (4 ) 2,006 Operating income (loss) — — (29 ) 394 113 — 478 Interest expense — (52 ) (33 ) — (16 ) — (101 ) Gain (loss) on foreign currency transactions — — (1 ) (9 ) 7 — (3 ) Other non-operating income (loss), net — (9 ) — (5 ) 2 — (12 ) Income (loss) before income taxes and equity in earnings from subsidiaries — (61 ) (63 ) 380 106 — 362 Income tax benefit (expense) — 15 14 (94 ) (36 ) — (101 ) Income (loss) before equity in earnings from subsidiaries — (46 ) (49 ) 286 70 — 261 Equity in earnings from subsidiaries 260 306 355 260 — (1,181 ) — Net income 260 260 306 546 70 (1,181 ) 261 Net income attributable to noncontrolling interests — — — — (1 ) — (1 ) Net income attributable to Hilton stockholders $ 260 $ 260 $ 306 $ 546 $ 69 $ (1,181 ) $ 260 Comprehensive income $ 252 $ 235 $ 308 $ 546 $ 85 $ (1,173 ) $ 253 Comprehensive income attributable to noncontrolling interests — — — — (1 ) — (1 ) Comprehensive income attributable to Hilton stockholders $ 252 $ 235 $ 308 $ 546 $ 84 $ (1,173 ) $ 252 Three Months Ended June 30, 2018 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Revenues Franchise and licensing fees $ — $ — $ 50 $ 322 $ 36 $ (4 ) $ 404 Base and other management fees — — 1 55 28 — 84 Incentive management fees — — — 22 37 — 59 Owned and leased hotels — — — — 392 — 392 Other revenues — — 1 17 3 1 22 — — 52 416 496 (3 ) 961 Other revenues from managed and franchised properties — — 62 1,110 158 — 1,330 Total revenues — — 114 1,526 654 (3 ) 2,291 Expenses Owned and leased hotels — — — — 352 — 352 Depreciation and amortization — — 2 58 19 — 79 General and administrative — — 83 — 32 — 115 Other expenses — — 2 8 6 (4 ) 12 — — 87 66 409 (4 ) 558 Other expenses from managed and franchised properties — — 62 1,114 151 — 1,327 Total expenses — — 149 1,180 560 (4 ) 1,885 Operating income (loss) — — (35 ) 346 94 1 406 Interest expense — (57 ) (31 ) — (9 ) 2 (95 ) Gain (loss) on foreign currency transactions — — 6 (89 ) 71 — (12 ) Other non-operating income (loss), net — (7 ) 1 4 4 (3 ) (1 ) Income (loss) before income taxes and equity in earnings from subsidiaries — (64 ) (59 ) 261 160 — 298 Income tax benefit (expense) — 16 14 (61 ) (50 ) — (81 ) Income (loss) before equity in earnings from subsidiaries — (48 ) (45 ) 200 110 — 217 Equity in earnings from subsidiaries 217 265 310 217 — (1,009 ) — Net income 217 217 265 417 110 (1,009 ) 217 Net income attributable to noncontrolling interests — — — — — — — Net income attributable to Hilton stockholders $ 217 $ 217 $ 265 $ 417 $ 110 $ (1,009 ) $ 217 Comprehensive income $ 155 $ 227 $ 266 $ 416 $ 38 $ (947 ) $ 155 Comprehensive income attributable to noncontrolling interests — — — — — — — Comprehensive income attributable to Hilton stockholders $ 155 $ 227 $ 266 $ 416 $ 38 $ (947 ) $ 155 Six Months Ended June 30, 2019 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Revenues Franchise and licensing fees $ — $ — $ 130 $ 632 $ 73 $ (9 ) $ 826 Base and other management fees — — — 109 60 — 169 Incentive management fees — — — 44 69 — 113 Owned and leased hotels — — — — 699 — 699 Other revenues — — 1 43 8 — 52 — — 131 828 909 (9 ) 1,859 Other revenues from managed and franchised properties — — 156 2,386 287 — 2,829 Total revenues — — 287 3,214 1,196 (9 ) 4,688 Expenses Owned and leased hotels — — — — 632 — 632 Depreciation and amortization — — 3 125 42 — 170 General and administrative — — 171 — 62 (13 ) 220 Other expenses — — 4 10 17 4 35 — — 178 135 753 (9 ) 1,057 Other expenses from managed and franchised properties — — 159 2,402 280 — 2,841 Total expenses — — 337 2,537 1,033 (9 ) 3,898 Operating income (loss) — — (50 ) 677 163 — 790 Interest expense — (103 ) (68 ) — (28 ) — (199 ) Gain (loss) on foreign currency transactions — — 1 (27 ) 23 — (3 ) Other non-operating income (loss), net — (9 ) — (5 ) 6 — (8 ) Income (loss) before income taxes and equity in earnings from subsidiaries — (112 ) (117 ) 645 164 — 580 Income tax benefit (expense) — 27 27 (159 ) (55 ) — (160 ) Income (loss) before equity in earnings from subsidiaries — (85 ) (90 ) 486 109 — 420 Equity in earnings from subsidiaries 418 503 593 418 — (1,932 ) — Net income 418 418 503 904 109 (1,932 ) 420 Net income attributable to noncontrolling interests — — — — (2 ) — (2 ) Net income attributable to Hilton stockholders $ 418 $ 418 $ 503 $ 904 $ 107 $ (1,932 ) $ 418 Comprehensive income $ 394 $ 378 $ 506 $ 904 $ 122 $ (1,908 ) $ 396 Comprehensive income attributable to noncontrolling interests — — — — (2 ) — (2 ) Comprehensive income attributable to Hilton stockholders $ 394 $ 378 $ 506 $ 904 $ 120 $ (1,908 ) $ 394 Six Months Ended June 30, 2018 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Revenues Franchise and licensing fees $ — $ — $ 94 $ 584 $ 65 $ (8 ) $ 735 Base and other management fees — — 1 106 54 — 161 Incentive management fees — — — 43 71 — 114 Owned and leased hotels — — — — 726 — 726 Other revenues — — 3 41 5 (4 ) 45 — — 98 774 921 (12 ) 1,781 Other revenues from managed and franchised properties — — 106 2,180 298 — 2,584 Total revenues — — 204 2,954 1,219 (12 ) 4,365 Expenses Owned and leased hotels — — — — 672 — 672 Depreciation and amortization — — 3 118 40 — 161 General and administrative — — 156 — 67 (4 ) 219 Other expenses — — 4 15 15 (8 ) 26 — — 163 133 794 (12 ) 1,078 Other expenses from managed and franchised properties — — 108 2,198 296 — 2,602 Total expenses — — 271 2,331 1,090 (12 ) 3,680 Operating income (loss) — — (67 ) 623 129 — 685 Interest expense — (118 ) (44 ) — (19 ) 3 (178 ) Gain (loss) on foreign currency transactions — — 3 (81 ) 77 — (1 ) Other non-operating income (loss), net — (7 ) 4 12 7 (3 ) 13 Income (loss) before income taxes and equity in earnings from subsidiaries — (125 ) (104 ) 554 194 — 519 Income tax benefit (expense) — 31 27 (134 ) (63 ) — (139 ) Income (loss) before equity in earnings from subsidiaries — (94 ) (77 ) 420 131 — 380 Equity in earnings from subsidiaries 378 472 549 378 — (1,777 ) — Net income 378 378 472 798 131 (1,777 ) 380 Net income attributable to noncontrolling interests — — — — (2 ) — (2 ) Net income attributable to Hilton stockholders $ 378 $ 378 $ 472 $ 798 $ 129 $ (1,777 ) $ 378 Comprehensive income $ 377 $ 417 $ 473 $ 798 $ 90 $ (1,776 ) $ 379 Comprehensive income attributable to noncontrolling interests — — — — (2 ) — (2 ) Comprehensive income attributable to Hilton stockholders $ 377 $ 417 $ 473 $ 798 $ 88 $ (1,776 ) $ 377 Six Months Ended June 30, 2019 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Operating Activities: Net cash provided by (used in) operating activities $ — $ (85 ) $ — $ 675 $ 75 $ (15 ) $ 650 Investing Activities: Capital expenditures for property and equipment — — (5 ) (3 ) (38 ) — (46 ) Capitalized software costs — — — (44 ) — — (44 ) Other — — — 1 (6 ) — (5 ) Net cash used in investing activities — — (5 ) (46 ) (44 ) — (95 ) Financing Activities: Borrowings — 795 1,000 — — — 1,795 Repayment of debt — (1,295 ) (14 ) — (8 ) — (1,317 ) Debt issuance costs — (13 ) (14 ) — — — (27 ) Intercompany transfers 740 598 (933 ) (622 ) 217 — — Dividends paid (87 ) — — — — — (87 ) Repurchases of common stock (653 ) — — — — — (653 ) Intercompany dividends — — — — (15 ) 15 — Share-based compensation tax withholdings and other — — (34 ) — — — (34 ) Net cash provided by (used in) financing activities — 85 5 (622 ) 194 15 (323 ) Effect of exchange rate changes on cash, restricted cash and cash equivalents — — — — 2 — 2 Net increase in cash, restricted cash and cash equivalents — — — 7 227 — 234 Cash, restricted cash and cash equivalents, beginning of period — — 37 32 415 — 484 Cash, restricted cash and cash equivalents, end of period $ — $ — $ 37 $ 39 $ 642 $ — $ 718 Six Months Ended June 30, 2018 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Operating Activities: Net cash provided by (used in) operating activities $ — $ (102 ) $ (8 ) $ 494 $ 148 $ — $ 532 Investing Activities: Capital expenditures for property and equipment — — (4 ) (1 ) (23 ) — (28 ) Capitalized software costs — — — (38 ) — — (38 ) Other — — — (3 ) (6 ) — (9 ) Net cash used in investing activities — — (4 ) (42 ) (29 ) — (75 ) Financing Activities: Borrowings — 150 1,500 — — — 1,650 Repayment of debt — (660 ) — — (12 ) — (672 ) Debt issuance costs — — (21 ) — — — (21 ) Intercompany transfers 1,531 612 (1,451 ) (450 ) (242 ) — — Dividends paid (92 ) — — — — — (92 ) Repurchases of common stock (1,439 ) — — — — — (1,439 ) Share-based compensation tax withholdings and other — — (42 ) — — — (42 ) Net cash provided by (used in) financing activities — 102 (14 ) (450 ) (254 ) — (616 ) Effect of exchange rate changes on cash, restricted cash and cash equivalents — — — — (6 ) — (6 ) Net increase (decrease) in cash, restricted cash and cash equivalents — — (26 ) 2 (141 ) — (165 ) Cash, restricted cash and cash equivalents, beginning of period — — 63 28 579 — 670 Cash, restricted cash and cash equivalents, end of period $ — $ — $ 37 $ 30 $ 438 $ — $ 505	Condensed Consolidating Guarantor Financial Information In April 2018, Hilton Domestic Operating Company Inc. ("HOC"), which is 100 percent owned by Hilton Worldwide Finance LLC, issued the 2026 Senior Notes. In March 2017, Hilton Worldwide Finance LLC and Hilton Worldwide Finance Corp. (the "HWF Issuers"), entities that are 100 percent owned by Hilton Worldwide Parent LLC ("HWP"), which is 100 percent owned by the Parent, issued the 2025 Senior Notes and 2027 Senior Notes. In September 2016, HOC assumed the 2024 Senior Notes that were issued in August 2016 by escrow issuers. In October 2013, the HWF Issuers issued the 2021 Senior Notes, which were redeemed in full in March 2017. See Note 9 : " Debt " for additional information. The HWF Issuers are guarantors of the 2026 Senior Notes and the 2024 Senior Notes. HOC is a guarantor of the 2025 Senior Notes and the 2027 Senior Notes and was a guarantor of the 2021 Senior Notes prior to their redemption. The 2024 Senior Notes, 2025 Senior Notes, 2026 Senior Notes and 2027 Senior Notes are collectively referred to as the Senior Notes. The HWF Issuers and HOC are collectively referred to as the Subsidiary Issuers. The Senior Notes are guaranteed jointly and severally on a senior unsecured basis by HWP, the Parent and certain of the Parent's 100 percent owned domestic restricted subsidiaries that are themselves not issuers of the applicable series of Senior Notes (together, the "Guarantors''). The indentures that govern the Senior Notes provide that any subsidiary of the Company that provides a guarantee of our senior secured credit facility will guarantee the Senior Notes. As of December 31, 2018 , none of our foreign subsidiaries or U.S. subsidiaries owned by foreign subsidiaries or conducting foreign operations or our non-wholly owned subsidiaries guaranteed the Senior Notes (collectively, the "Non-Guarantors"). The guarantees are full and unconditional, subject to certain customary release provisions. The indentures that govern the Senior Notes provide that any Guarantor may be released from its guarantee so long as: (i) the subsidiary is sold or sells all of its assets; (ii) the subsidiary is released from its guaranty under our senior secured credit facility; (iii) the subsidiary is declared "unrestricted" for covenant purposes; (iv) the subsidiary is merged with or into the applicable Subsidiary Issuers or another Guarantor or the Guarantor liquidates after transferring all of its assets to the applicable Subsidiary Issuers or another Guarantor; or (v) the requirements for legal defeasance or covenant defeasance or to discharge the indenture have been satisfied, in each case in compliance with applicable provisions of the indentures. The following tables present the condensed consolidating financial information as of December 31, 2018 and 2017 and for the years ended December 31, 2018 , 2017 and 2016 , for the Parent, HWF Issuers, HOC, Guarantors and Non-Guarantors. December 31, 2018 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) ASSETS Current Assets: Cash and cash equivalents $ — $ — $ 3 $ 17 $ 383 $ — $ 403 Restricted cash and cash equivalents — — 34 15 32 — 81 Accounts receivable, net — — 10 735 405 — 1,150 Intercompany receivables — — — — 40 (40 ) — Prepaid expenses — — 52 37 80 (9 ) 160 Income taxes receivable — — — 23 — (3 ) 20 Other — 1 1 13 154 — 169 Total current assets — 1 100 840 1,094 (52 ) 1,983 Intangibles and Other Assets: Investments in subsidiaries 557 5,131 7,930 557 — (14,175 ) — Goodwill — — — 3,824 1,336 — 5,160 Brands — — — 4,404 465 — 4,869 Management and franchise contracts, net — — — 556 316 — 872 Other intangible assets, net — — — 287 128 — 415 Property and equipment, net — — 27 65 275 — 367 Deferred income tax assets 4 — 94 — 90 (98 ) 90 Other — 23 33 22 161 — 239 Total intangibles and other assets 561 5,154 8,084 9,715 2,771 (14,273 ) 12,012 TOTAL ASSETS $ 561 $ 5,155 $ 8,184 $ 10,555 $ 3,865 $ (14,325 ) $ 13,995 LIABILITIES AND EQUITY Current Liabilities: Accounts payable, accrued expenses and other $ 10 $ 19 $ 229 $ 529 $ 743 $ — $ 1,530 Current portion of deferred revenues — — 106 239 14 (9 ) 350 Intercompany payables — — 40 — — (40 ) — Current maturities of long-term debt — — — — 16 — 16 Income taxes payable — — — — 22 (3 ) 19 Current portion of liability for guest loyalty program — — — 700 — — 700 Total current liabilities 10 19 375 1,468 795 (52 ) 2,615 Long-term debt — 4,573 2,467 — 226 — 7,266 Deferred revenues — — — 762 64 — 826 Deferred income tax liabilities — 6 — 962 28 (98 ) 898 Liability for guest loyalty program — — — 969 — — 969 Other — — 211 93 559 — 863 Total liabilities 10 4,598 3,053 4,254 1,672 (150 ) 13,437 Equity: Total Hilton stockholders' equity 551 557 5,131 6,301 2,186 (14,175 ) 551 Noncontrolling interests — — — — 7 — 7 Total equity 551 557 5,131 6,301 2,193 (14,175 ) 558 TOTAL LIABILITIES AND EQUITY $ 561 $ 5,155 $ 8,184 $ 10,555 $ 3,865 $ (14,325 ) $ 13,995 December 31, 2017 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) ASSETS Current Assets: Cash and cash equivalents $ — $ — $ 2 $ 18 $ 550 $ — $ 570 Restricted cash and cash equivalents — — 61 10 29 — 100 Accounts receivable, net — — 18 712 275 — 1,005 Intercompany receivables — — — — 40 (40 ) — Prepaid expenses — — 25 24 84 (6 ) 127 Income taxes receivable — — — 60 — (24 ) 36 Other — — 1 13 155 — 169 Total current assets — — 107 837 1,133 (70 ) 2,007 Intangibles and Other Assets: Investments in subsidiaries 1,697 7,067 8,326 1,697 — (18,787 ) — Goodwill — — — 3,824 1,366 — 5,190 Brands — — — 4,405 485 — 4,890 Management and franchise contracts, net — — 2 645 306 — 953 Other intangible assets, net — — 1 283 149 — 433 Property and equipment, net — — 20 67 266 — 353 Deferred income tax assets 6 — 104 — 127 (126 ) 111 Other — 20 32 67 172 — 291 Total intangibles and other assets 1,703 7,087 8,485 10,988 2,871 (18,913 ) 12,221 TOTAL ASSETS $ 1,703 $ 7,087 $ 8,592 $ 11,825 $ 4,004 $ (18,983 ) $ 14,228 LIABILITIES AND EQUITY Current Liabilities: Accounts payable, accrued expenses and other $ 15 $ 20 $ 184 $ 576 $ 624 $ (3 ) $ 1,416 Current portion of deferred revenues — — 90 266 13 (3 ) 366 Intercompany payables — — 40 — — (40 ) — Current maturities of long-term debt — 32 — — 14 — 46 Income taxes payable — — — — 36 (24 ) 12 Current portion of liability for guest loyalty program — — — 622 — — 622 Total current liabilities 15 52 314 1,464 687 (70 ) 2,462 Long-term debt — 5,333 983 — 240 — 6,556 Deferred revenues — — — 770 59 — 829 Deferred income tax liabilities — 5 — 1,052 — (126 ) 931 Liability for guest loyalty program — — — 839 — — 839 Other — — 228 64 628 — 920 Total liabilities 15 5,390 1,525 4,189 1,614 (196 ) 12,537 Equity: Total Hilton stockholders' equity 1,688 1,697 7,067 7,636 2,387 (18,787 ) 1,688 Noncontrolling interests — — — — 3 — 3 Total equity 1,688 1,697 7,067 7,636 2,390 (18,787 ) 1,691 TOTAL LIABILITIES AND EQUITY $ 1,703 $ 7,087 $ 8,592 $ 11,825 $ 4,004 $ (18,983 ) $ 14,228 Year Ended December 31, 2018 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Revenues Franchise and licensing fees $ — $ — $ 227 $ 1,182 $ 139 $ (18 ) $ 1,530 Base and other management fees — — 1 205 115 — 321 Incentive management fees — — — 78 157 — 235 Owned and leased hotels — — — — 1,484 — 1,484 Other revenues — — 6 81 11 — 98 — — 234 1,546 1,906 (18 ) 3,668 Other revenues from managed and franchised properties — — 245 4,376 617 — 5,238 Total revenues — — 479 5,922 2,523 (18 ) 8,906 Expenses Owned and leased hotels — — — — 1,332 — 1,332 Depreciation and amortization — — 6 237 82 — 325 General and administrative — — 323 — 130 (10 ) 443 Other expenses — — 7 22 30 (8 ) 51 — — 336 259 1,574 (18 ) 2,151 Other expenses from managed and franchised properties — — 236 4,466 621 — 5,323 Total expenses — — 572 4,725 2,195 (18 ) 7,474 Operating income (loss) — — (93 ) 1,197 328 — 1,432 Interest expense — (227 ) (106 ) — (38 ) — (371 ) Gain (loss) on foreign currency transactions — — 4 84 (99 ) — (11 ) Other non-operating income (loss), net — (9 ) 3 16 18 — 28 Income (loss) before income taxes and equity in earnings from subsidiaries — (236 ) (192 ) 1,297 209 — 1,078 Income tax benefit (expense) — 57 39 (309 ) (96 ) — (309 ) Income (loss) before equity in earnings from subsidiaries — (179 ) (153 ) 988 113 — 769 Equity in earnings from subsidiaries 764 943 1,096 764 — (3,567 ) — Net income 764 764 943 1,752 113 (3,567 ) 769 Net income attributable to noncontrolling interests — — — — (5 ) — (5 ) Net income attributable to Hilton stockholders $ 764 $ 764 $ 943 $ 1,752 $ 108 $ (3,567 ) $ 764 Comprehensive income $ 707 $ 784 $ 932 $ 1,751 $ 48 $ (3,510 ) $ 712 Comprehensive income attributable to noncontrolling interests — — — — (5 ) — (5 ) Comprehensive income attributable to Hilton stockholders $ 707 $ 784 $ 932 $ 1,751 $ 43 $ (3,510 ) $ 707 Year Ended December 31, 2017 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Revenues Franchise and licensing fees $ — $ — $ 143 $ 1,077 $ 118 $ (17 ) $ 1,321 Base and other management fees — — 1 195 128 — 324 Incentive management fees — — — 76 146 — 222 Owned and leased hotels — — — — 1,432 — 1,432 Other revenues — — 31 70 11 (7 ) 105 — — 175 1,418 1,835 (24 ) 3,404 Other revenues from managed and franchised properties — — 159 3,986 582 — 4,727 Total revenues — — 334 5,404 2,417 (24 ) 8,131 Expenses Owned and leased hotels — — — — 1,269 — 1,269 Depreciation and amortization — — 5 242 89 — 336 General and administrative — — 327 — 118 (6 ) 439 Other expenses — — 17 29 27 (17 ) 56 — — 349 271 1,503 (23 ) 2,100 Other expenses from managed and franchised properties — — 147 4,147 605 — 4,899 Total expenses — — 496 4,418 2,108 (23 ) 6,999 Gain (loss) on sales of assets, net — — — (1 ) 1 — — Operating income (loss) — — (162 ) 985 310 (1 ) 1,132 Interest expense — (244 ) (61 ) — (47 ) 1 (351 ) Gain (loss) on foreign currency transactions — — 10 124 (131 ) — 3 Loss on debt extinguishment — (60 ) — — — — (60 ) Other non-operating income (loss), net — (3 ) 4 7 21 — 29 Income (loss) before income taxes and equity in earnings from subsidiaries — (307 ) (209 ) 1,116 153 — 753 Income tax benefit (expense) (3 ) 122 26 89 102 — 336 Income (loss) before equity in earnings from subsidiaries (3 ) (185 ) (183 ) 1,205 255 — 1,089 Equity in earnings from subsidiaries 1,087 1,272 1,455 1,087 — (4,901 ) — Net income 1,084 1,087 1,272 2,292 255 (4,901 ) 1,089 Net income attributable to noncontrolling interests — — — — (5 ) — (5 ) Net income attributable to Hilton stockholders $ 1,084 $ 1,087 $ 1,272 $ 2,292 $ 250 $ (4,901 ) $ 1,084 Comprehensive income $ 1,281 $ 1,101 $ 1,288 $ 2,295 $ 419 $ (5,098 ) $ 1,286 Comprehensive income attributable to noncontrolling interests — — — — (5 ) — (5 ) Comprehensive income attributable to Hilton stockholders $ 1,281 $ 1,101 $ 1,288 $ 2,295 $ 414 $ (5,098 ) $ 1,281 Year Ended December 31, 2016 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Revenues Franchise and licensing fees $ — $ — $ 21 $ 974 $ 106 $ (10 ) $ 1,091 Base and other management fees — — — 122 108 — 230 Incentive management fees — — — 16 126 — 142 Owned and leased hotels — — — — 1,434 — 1,434 Other revenues — — 10 61 11 — 82 — — 31 1,173 1,785 (10 ) 2,979 Other revenues from managed and franchised properties — — 32 3,053 512 — 3,597 Total revenues — — 63 4,226 2,297 (10 ) 6,576 Expenses Owned and leased hotels — — — — 1,279 — 1,279 Depreciation and amortization — — 1 266 86 — 353 General and administrative — — 90 203 116 — 409 Other expenses — — 1 31 44 (10 ) 66 — — 92 500 1,525 (10 ) 2,107 Other expenses from managed and franchised properties — — 32 3,083 494 — 3,609 Total expenses — — 124 3,583 2,019 (10 ) 5,716 Gain on sales of assets, net — — — — 8 — 8 Operating income (loss) — — (61 ) 643 286 — 868 Interest expense — (261 ) (14 ) (12 ) (47 ) — (334 ) Gain (loss) on foreign currency transactions — — 11 (150 ) 123 — (16 ) Other non-operating income, net — 1 1 7 13 — 22 Income (loss) from continuing operations before income taxes and equity in losses from subsidiaries — (260 ) (63 ) 488 375 — 540 Income tax benefit (expense) 193 100 26 (297 ) (579 ) — (557 ) Income (loss) from continuing operations before equity in losses from subsidiaries 193 (160 ) (37 ) 191 (204 ) — (17 ) Equity in losses from subsidiaries (220 ) (60 ) (23 ) (220 ) — 523 — Loss from continuing operations, net of taxes (27 ) (220 ) (60 ) (29 ) (204 ) 523 (17 ) Income from discontinued operations, net of taxes 365 365 365 426 375 (1,525 ) 371 Net income 338 145 305 397 171 (1,002 ) 354 Net income attributable to noncontrolling interests — — — — (16 ) — (16 ) Net income attributable to Hilton stockholders $ 338 $ 145 $ 305 $ 397 $ 155 $ (1,002 ) $ 338 Comprehensive income $ 121 $ 143 $ 310 $ 326 $ 21 $ (785 ) $ 136 Comprehensive income attributable to noncontrolling interests — — — — (15 ) — (15 ) Comprehensive income attributable to Hilton stockholders $ 121 $ 143 $ 310 $ 326 $ 6 $ (785 ) $ 121 Year Ended December 31, 2018 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Operating Activities: Net cash provided by (used in) operating activities $ — $ (185 ) $ (8 ) $ 1,267 $ 181 $ — $ 1,255 Investing Activities: Capital expenditures for property and equipment — — (9 ) (7 ) (56 ) — (72 ) Payments received on other financing receivables — — — 49 1 — 50 Capitalized software costs — — — (87 ) — — (87 ) Other — — — (6 ) (16 ) — (22 ) Net cash used in investing activities — — (9 ) (51 ) (71 ) — (131 ) Financing Activities: Borrowings — 175 1,500 — 1 — 1,676 Repayment of debt — (985 ) — — (20 ) — (1,005 ) Debt issuance costs — — (21 ) — — — (21 ) Intercompany transfers 1,902 995 (1,444 ) (1,209 ) (244 ) — — Dividends paid (181 ) — — — — — (181 ) Repurchases of common stock (1,721 ) — — — — — (1,721 ) Distributions to noncontrolling interests — — — — (1 ) — (1 ) Tax withholdings on share-based compensation — — (44 ) — — — (44 ) Acquisition of noncontrolling interest — — — (3 ) — — (3 ) Net cash provided by (used in) financing activities — 185 (9 ) (1,212 ) (264 ) — (1,300 ) Effect of exchange rate changes on cash, restricted cash and cash equivalents — — — — (10 ) — (10 ) Net increase (decrease) in cash, restricted cash and cash equivalents — — (26 ) 4 (164 ) — (186 ) Cash, restricted cash and cash equivalents, beginning of period — — 63 28 579 — 670 Cash, restricted cash and cash equivalents, end of period $ — $ — $ 37 $ 32 $ 415 $ — $ 484 Year Ended December 31, 2017 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Operating Activities: Net cash provided by (used in) operating activities $ — $ (113 ) $ (103 ) $ 950 $ 285 $ (170 ) $ 849 Investing Activities: Capital expenditures for property and equipment — — (12 ) (12 ) (34 ) — (58 ) Payments received on other financing receivables — — — 7 — — 7 Capitalized software costs — — — (75 ) — — (75 ) Other — (13 ) — (8 ) 3 (3 ) (21 ) Net cash used in investing activities — (13 ) (12 ) (88 ) (31 ) (3 ) (147 ) Financing Activities: Borrowings — 1,822 — — 2 — 1,824 Repayment of debt — (1,852 ) — — (8 ) — (1,860 ) Debt issuance costs and redemption premium — (69 ) — — — — (69 ) Repayment of intercompany borrowings — — (3 ) — — 3 — Intercompany transfers 1,086 225 122 (865 ) (568 ) — — Dividends paid (195 ) — — — — — (195 ) Intercompany dividends — — — — (170 ) 170 — Cash transferred in spin-offs of Park and HGV — — — — (501 ) — (501 ) Repurchases of common stock (891 ) — — — — — (891 ) Distributions to noncontrolling interests — — — — (1 ) — (1 ) Tax withholdings on share-based compensation — — (31 ) — — — (31 ) Net cash provided by (used in) financing activities — 126 88 (865 ) (1,246 ) 173 (1,724 ) Effect of exchange rate changes on cash, restricted cash and cash equivalents — — — — 8 — 8 Net decrease in cash, restricted cash and cash equivalents — — (27 ) (3 ) (984 ) — (1,014 ) Cash, restricted cash and cash equivalents from continuing operations, beginning of period — — 90 31 1,062 — 1,183 Cash, restricted cash and cash equivalents from discontinued operations, beginning of period — — — — 501 — 501 Cash, restricted cash and cash equivalents, beginning of period — — 90 31 1,563 — 1,684 Cash, restricted cash and cash equivalents, end of period $ — $ — $ 63 $ 28 $ 579 $ — $ 670 Year Ended December 31, 2016 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Operating Activities: Net cash provided by (used in) operating activities $ — $ (37 ) $ — $ 866 $ 1,086 $ (605 ) $ 1,310 Investing Activities: Capital expenditures for property and equipment — — — (9 ) (308 ) — (317 ) Payments received on other financing receivables — — — 2 1 — 3 Issuance of intercompany receivables — — — (192 ) (42 ) 234 — Payments received on intercompany receivables — — — 192 — (192 ) — Capitalized software costs — — — (73 ) (8 ) — (81 ) Other — (6 ) — (37 ) 15 — (28 ) Net cash used in investing activities — (6 ) — (117 ) (342 ) 42 (423 ) Financing Activities: Borrowings — — 1,000 — 3,715 — 4,715 Repayment of debt — (266 ) — — (4,093 ) — (4,359 ) Debt issuance costs — (17 ) (20 ) — (39 ) — (76 ) Intercompany borrowings — — — 42 192 (234 ) — Repayment of intercompany borrowings — — — — (192 ) 192 — Intercompany transfers 277 326 (890 ) (854 ) 1,141 — — Dividends paid (277 ) — — — — — (277 ) Intercompany dividends — — — — (605 ) 605 — Distributions to noncontrolling interests — — — — (32 ) — (32 ) Tax withholdings on share-based compensation — — — (15 ) — — (15 ) Net cash provided by (used in) financing activities — 43 90 (827 ) 87 563 (44 ) Effect of exchange rate changes on cash, restricted cash and cash equivalents — — — — (15 ) — (15 ) Net increase (decrease) in cash, restricted cash and cash equivalents — — 90 (78 ) 816 — 828 Cash, restricted cash and cash equivalents from continuing operations, beginning of period — — — 109 524 — 633 Cash, restricted cash and cash equivalents from discontinued operations, beginning of period — — — — 223 — 223 Cash, restricted cash and cash equivalents, beginning of period — — — 109 747 — 856 Cash, restricted cash and cash equivalents from continuing operations, end of period — — 90 31 1,062 — 1,183 Cash, restricted cash and cash equivalents from discontinued operations, end of period — — — — 501 — 501 Cash, restricted cash and cash equivalents, end of period $ — $ — $ 90 $ 31 $ 1,563 $ — $ 1,684
Condensed Balance Sheet [Table Text Block]	June 30, 2019 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) ASSETS Current Assets: Cash and cash equivalents $ — $ — $ 3 $ 23 $ 609 $ — $ 635 Restricted cash and cash equivalents — — 34 16 33 — 83 Accounts receivable, net — — 14 852 324 — 1,190 Intercompany receivables — — — — 40 (40 ) — Prepaid expenses — — 16 48 55 (2 ) 117 Other — 1 1 48 147 (7 ) 190 Total current assets — 1 68 987 1,208 (49 ) 2,215 Intangibles and Other Assets: Investments in subsidiaries 2 4,113 7,850 2 — (11,967 ) — Goodwill — — — 3,824 1,333 — 5,157 Brands — — — 4,405 469 — 4,874 Management and franchise contracts, net — — 1 502 314 — 817 Other intangible assets, net — — — 279 121 — 400 Operating lease right-of-use assets — — 36 10 845 — 891 Property and equipment, net — — 61 67 290 — 418 Deferred income tax assets 4 7 86 — 146 (97 ) 146 Other — 12 31 17 162 — 222 Total intangibles and other assets 6 4,132 8,065 9,106 3,680 (12,064 ) 12,925 TOTAL ASSETS $ 6 $ 4,133 $ 8,133 $ 10,093 $ 4,888 $ (12,113 ) $ 15,140 LIABILITIES AND EQUITY (DEFICIT) Current Liabilities: Accounts payable, accrued expenses and other $ 36 $ 20 $ 201 $ 664 $ 743 $ (7 ) $ 1,657 Current maturities of long-term debt — — 20 — 17 — 37 Current portion of deferred revenues — — 47 241 12 (2 ) 298 Intercompany payables — — 40 — — (40 ) — Current portion of liability for guest loyalty program — — — 788 — — 788 Total current liabilities 36 20 308 1,693 772 (49 ) 2,780 Long-term debt — 4,076 3,473 — 223 — 7,772 Operating lease liabilities — — 43 8 1,015 — 1,066 Deferred revenues — — — 754 68 — 822 Deferred income tax liabilities — — — 958 — (97 ) 861 Liability for guest loyalty program — — — 986 — — 986 Other — 35 196 94 551 — 876 Total liabilities 36 4,131 4,020 4,493 2,629 (146 ) 15,163 Equity (Deficit): Total Hilton stockholders' equity (deficit) (30 ) 2 4,113 5,600 2,252 (11,967 ) (30 ) Noncontrolling interests — — — — 7 — 7 Total equity (deficit) (30 ) 2 4,113 5,600 2,259 (11,967 ) (23 ) TOTAL LIABILITIES AND EQUITY (DEFICIT) $ 6 $ 4,133 $ 8,133 $ 10,093 $ 4,888 $ (12,113 ) $ 15,140 December 31, 2018 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) ASSETS Current Assets: Cash and cash equivalents $ — $ — $ 3 $ 17 $ 383 $ — $ 403 Restricted cash and cash equivalents — — 34 15 32 — 81 Accounts receivable, net — — 10 735 405 — 1,150 Intercompany receivables — — — — 40 (40 ) — Prepaid expenses — — 52 37 80 (9 ) 160 Other — 1 1 36 154 (3 ) 189 Total current assets — 1 100 840 1,094 (52 ) 1,983 Intangibles and Other Assets: Investments in subsidiaries 557 5,131 7,930 557 — (14,175 ) — Goodwill — — — 3,824 1,336 — 5,160 Brands — — — 4,404 465 — 4,869 Management and franchise contracts, net — — — 556 316 — 872 Other intangible assets, net — — — 287 128 — 415 Property and equipment, net — — 27 65 275 — 367 Deferred income tax assets 4 — 94 — 90 (98 ) 90 Other — 23 33 22 161 — 239 Total intangibles and other assets 561 5,154 8,084 9,715 2,771 (14,273 ) 12,012 TOTAL ASSETS $ 561 $ 5,155 $ 8,184 $ 10,555 $ 3,865 $ (14,325 ) $ 13,995 LIABILITIES AND EQUITY Current Liabilities: Accounts payable, accrued expenses and other $ 10 $ 19 $ 229 $ 529 $ 765 $ (3 ) $ 1,549 Current maturities of long-term debt — — — — 16 — 16 Current portion of deferred revenues — — 106 239 14 (9 ) 350 Intercompany payables — — 40 — — (40 ) — Current portion of liability for guest loyalty program — — — 700 — — 700 Total current liabilities 10 19 375 1,468 795 (52 ) 2,615 Long-term debt — 4,573 2,467 — 226 — 7,266 Deferred revenues — — — 762 64 — 826 Deferred income tax liabilities — 6 — 962 28 (98 ) 898 Liability for guest loyalty program — — — 969 — — 969 Other — — 211 93 559 — 863 Total liabilities 10 4,598 3,053 4,254 1,672 (150 ) 13,437 Equity: Total Hilton stockholders' equity 551 557 5,131 6,301 2,186 (14,175 ) 551 Noncontrolling interests — — — — 7 — 7 Total equity 551 557 5,131 6,301 2,193 (14,175 ) 558 TOTAL LIABILITIES AND EQUITY $ 561 $ 5,155 $ 8,184 $ 10,555 $ 3,865 $ (14,325 ) $ 13,995	The following tables present the condensed consolidating financial information as of December 31, 2018 and 2017 and for the years ended December 31, 2018 , 2017 and 2016 , for the Parent, HWF Issuers, HOC, Guarantors and Non-Guarantors. December 31, 2018 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) ASSETS Current Assets: Cash and cash equivalents $ — $ — $ 3 $ 17 $ 383 $ — $ 403 Restricted cash and cash equivalents — — 34 15 32 — 81 Accounts receivable, net — — 10 735 405 — 1,150 Intercompany receivables — — — — 40 (40 ) — Prepaid expenses — — 52 37 80 (9 ) 160 Income taxes receivable — — — 23 — (3 ) 20 Other — 1 1 13 154 — 169 Total current assets — 1 100 840 1,094 (52 ) 1,983 Intangibles and Other Assets: Investments in subsidiaries 557 5,131 7,930 557 — (14,175 ) — Goodwill — — — 3,824 1,336 — 5,160 Brands — — — 4,404 465 — 4,869 Management and franchise contracts, net — — — 556 316 — 872 Other intangible assets, net — — — 287 128 — 415 Property and equipment, net — — 27 65 275 — 367 Deferred income tax assets 4 — 94 — 90 (98 ) 90 Other — 23 33 22 161 — 239 Total intangibles and other assets 561 5,154 8,084 9,715 2,771 (14,273 ) 12,012 TOTAL ASSETS $ 561 $ 5,155 $ 8,184 $ 10,555 $ 3,865 $ (14,325 ) $ 13,995 LIABILITIES AND EQUITY Current Liabilities: Accounts payable, accrued expenses and other $ 10 $ 19 $ 229 $ 529 $ 743 $ — $ 1,530 Current portion of deferred revenues — — 106 239 14 (9 ) 350 Intercompany payables — — 40 — — (40 ) — Current maturities of long-term debt — — — — 16 — 16 Income taxes payable — — — — 22 (3 ) 19 Current portion of liability for guest loyalty program — — — 700 — — 700 Total current liabilities 10 19 375 1,468 795 (52 ) 2,615 Long-term debt — 4,573 2,467 — 226 — 7,266 Deferred revenues — — — 762 64 — 826 Deferred income tax liabilities — 6 — 962 28 (98 ) 898 Liability for guest loyalty program — — — 969 — — 969 Other — — 211 93 559 — 863 Total liabilities 10 4,598 3,053 4,254 1,672 (150 ) 13,437 Equity: Total Hilton stockholders' equity 551 557 5,131 6,301 2,186 (14,175 ) 551 Noncontrolling interests — — — — 7 — 7 Total equity 551 557 5,131 6,301 2,193 (14,175 ) 558 TOTAL LIABILITIES AND EQUITY $ 561 $ 5,155 $ 8,184 $ 10,555 $ 3,865 $ (14,325 ) $ 13,995	December 31, 2017 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) ASSETS Current Assets: Cash and cash equivalents $ — $ — $ 2 $ 18 $ 550 $ — $ 570 Restricted cash and cash equivalents — — 61 10 29 — 100 Accounts receivable, net — — 18 712 275 — 1,005 Intercompany receivables — — — — 40 (40 ) — Prepaid expenses — — 25 24 84 (6 ) 127 Income taxes receivable — — — 60 — (24 ) 36 Other — — 1 13 155 — 169 Total current assets — — 107 837 1,133 (70 ) 2,007 Intangibles and Other Assets: Investments in subsidiaries 1,697 7,067 8,326 1,697 — (18,787 ) — Goodwill — — — 3,824 1,366 — 5,190 Brands — — — 4,405 485 — 4,890 Management and franchise contracts, net — — 2 645 306 — 953 Other intangible assets, net — — 1 283 149 — 433 Property and equipment, net — — 20 67 266 — 353 Deferred income tax assets 6 — 104 — 127 (126 ) 111 Other — 20 32 67 172 — 291 Total intangibles and other assets 1,703 7,087 8,485 10,988 2,871 (18,913 ) 12,221 TOTAL ASSETS $ 1,703 $ 7,087 $ 8,592 $ 11,825 $ 4,004 $ (18,983 ) $ 14,228 LIABILITIES AND EQUITY Current Liabilities: Accounts payable, accrued expenses and other $ 15 $ 20 $ 184 $ 576 $ 624 $ (3 ) $ 1,416 Current portion of deferred revenues — — 90 266 13 (3 ) 366 Intercompany payables — — 40 — — (40 ) — Current maturities of long-term debt — 32 — — 14 — 46 Income taxes payable — — — — 36 (24 ) 12 Current portion of liability for guest loyalty program — — — 622 — — 622 Total current liabilities 15 52 314 1,464 687 (70 ) 2,462 Long-term debt — 5,333 983 — 240 — 6,556 Deferred revenues — — — 770 59 — 829 Deferred income tax liabilities — 5 — 1,052 — (126 ) 931 Liability for guest loyalty program — — — 839 — — 839 Other — — 228 64 628 — 920 Total liabilities 15 5,390 1,525 4,189 1,614 (196 ) 12,537 Equity: Total Hilton stockholders' equity 1,688 1,697 7,067 7,636 2,387 (18,787 ) 1,688 Noncontrolling interests — — — — 3 — 3 Total equity 1,688 1,697 7,067 7,636 2,390 (18,787 ) 1,691 TOTAL LIABILITIES AND EQUITY $ 1,703 $ 7,087 $ 8,592 $ 11,825 $ 4,004 $ (18,983 ) $ 14,228
Condensed Statement of Income and Comprehensive Income [Table Text Block]	Three Months Ended June 30, 2019 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Revenues Franchise and licensing fees $ — $ — $ 69 $ 338 $ 41 $ (4 ) $ 444 Base and other management fees — — — 57 32 — 89 Incentive management fees — — — 21 37 — 58 Owned and leased hotels — — — — 387 — 387 Other revenues — — 1 20 5 — 26 — — 70 436 502 (4 ) 1,004 Other revenues from managed and franchised properties — — 81 1,247 152 — 1,480 Total revenues — — 151 1,683 654 (4 ) 2,484 Expenses Owned and leased hotels — — — — 334 — 334 Depreciation and amortization — — 1 63 22 — 86 General and administrative — — 89 — 31 (7 ) 113 Other expenses — — 3 2 7 3 15 — — 93 65 394 (4 ) 548 Other expenses from managed and franchised properties — — 87 1,224 147 — 1,458 Total expenses — — 180 1,289 541 (4 ) 2,006 Operating income (loss) — — (29 ) 394 113 — 478 Interest expense — (52 ) (33 ) — (16 ) — (101 ) Gain (loss) on foreign currency transactions — — (1 ) (9 ) 7 — (3 ) Other non-operating income (loss), net — (9 ) — (5 ) 2 — (12 ) Income (loss) before income taxes and equity in earnings from subsidiaries — (61 ) (63 ) 380 106 — 362 Income tax benefit (expense) — 15 14 (94 ) (36 ) — (101 ) Income (loss) before equity in earnings from subsidiaries — (46 ) (49 ) 286 70 — 261 Equity in earnings from subsidiaries 260 306 355 260 — (1,181 ) — Net income 260 260 306 546 70 (1,181 ) 261 Net income attributable to noncontrolling interests — — — — (1 ) — (1 ) Net income attributable to Hilton stockholders $ 260 $ 260 $ 306 $ 546 $ 69 $ (1,181 ) $ 260 Comprehensive income $ 252 $ 235 $ 308 $ 546 $ 85 $ (1,173 ) $ 253 Comprehensive income attributable to noncontrolling interests — — — — (1 ) — (1 ) Comprehensive income attributable to Hilton stockholders $ 252 $ 235 $ 308 $ 546 $ 84 $ (1,173 ) $ 252 Three Months Ended June 30, 2018 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Revenues Franchise and licensing fees $ — $ — $ 50 $ 322 $ 36 $ (4 ) $ 404 Base and other management fees — — 1 55 28 — 84 Incentive management fees — — — 22 37 — 59 Owned and leased hotels — — — — 392 — 392 Other revenues — — 1 17 3 1 22 — — 52 416 496 (3 ) 961 Other revenues from managed and franchised properties — — 62 1,110 158 — 1,330 Total revenues — — 114 1,526 654 (3 ) 2,291 Expenses Owned and leased hotels — — — — 352 — 352 Depreciation and amortization — — 2 58 19 — 79 General and administrative — — 83 — 32 — 115 Other expenses — — 2 8 6 (4 ) 12 — — 87 66 409 (4 ) 558 Other expenses from managed and franchised properties — — 62 1,114 151 — 1,327 Total expenses — — 149 1,180 560 (4 ) 1,885 Operating income (loss) — — (35 ) 346 94 1 406 Interest expense — (57 ) (31 ) — (9 ) 2 (95 ) Gain (loss) on foreign currency transactions — — 6 (89 ) 71 — (12 ) Other non-operating income (loss), net — (7 ) 1 4 4 (3 ) (1 ) Income (loss) before income taxes and equity in earnings from subsidiaries — (64 ) (59 ) 261 160 — 298 Income tax benefit (expense) — 16 14 (61 ) (50 ) — (81 ) Income (loss) before equity in earnings from subsidiaries — (48 ) (45 ) 200 110 — 217 Equity in earnings from subsidiaries 217 265 310 217 — (1,009 ) — Net income 217 217 265 417 110 (1,009 ) 217 Net income attributable to noncontrolling interests — — — — — — — Net income attributable to Hilton stockholders $ 217 $ 217 $ 265 $ 417 $ 110 $ (1,009 ) $ 217 Comprehensive income $ 155 $ 227 $ 266 $ 416 $ 38 $ (947 ) $ 155 Comprehensive income attributable to noncontrolling interests — — — — — — — Comprehensive income attributable to Hilton stockholders $ 155 $ 227 $ 266 $ 416 $ 38 $ (947 ) $ 155 Six Months Ended June 30, 2019 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Revenues Franchise and licensing fees $ — $ — $ 130 $ 632 $ 73 $ (9 ) $ 826 Base and other management fees — — — 109 60 — 169 Incentive management fees — — — 44 69 — 113 Owned and leased hotels — — — — 699 — 699 Other revenues — — 1 43 8 — 52 — — 131 828 909 (9 ) 1,859 Other revenues from managed and franchised properties — — 156 2,386 287 — 2,829 Total revenues — — 287 3,214 1,196 (9 ) 4,688 Expenses Owned and leased hotels — — — — 632 — 632 Depreciation and amortization — — 3 125 42 — 170 General and administrative — — 171 — 62 (13 ) 220 Other expenses — — 4 10 17 4 35 — — 178 135 753 (9 ) 1,057 Other expenses from managed and franchised properties — — 159 2,402 280 — 2,841 Total expenses — — 337 2,537 1,033 (9 ) 3,898 Operating income (loss) — — (50 ) 677 163 — 790 Interest expense — (103 ) (68 ) — (28 ) — (199 ) Gain (loss) on foreign currency transactions — — 1 (27 ) 23 — (3 ) Other non-operating income (loss), net — (9 ) — (5 ) 6 — (8 ) Income (loss) before income taxes and equity in earnings from subsidiaries — (112 ) (117 ) 645 164 — 580 Income tax benefit (expense) — 27 27 (159 ) (55 ) — (160 ) Income (loss) before equity in earnings from subsidiaries — (85 ) (90 ) 486 109 — 420 Equity in earnings from subsidiaries 418 503 593 418 — (1,932 ) — Net income 418 418 503 904 109 (1,932 ) 420 Net income attributable to noncontrolling interests — — — — (2 ) — (2 ) Net income attributable to Hilton stockholders $ 418 $ 418 $ 503 $ 904 $ 107 $ (1,932 ) $ 418 Comprehensive income $ 394 $ 378 $ 506 $ 904 $ 122 $ (1,908 ) $ 396 Comprehensive income attributable to noncontrolling interests — — — — (2 ) — (2 ) Comprehensive income attributable to Hilton stockholders $ 394 $ 378 $ 506 $ 904 $ 120 $ (1,908 ) $ 394 Six Months Ended June 30, 2018 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Revenues Franchise and licensing fees $ — $ — $ 94 $ 584 $ 65 $ (8 ) $ 735 Base and other management fees — — 1 106 54 — 161 Incentive management fees — — — 43 71 — 114 Owned and leased hotels — — — — 726 — 726 Other revenues — — 3 41 5 (4 ) 45 — — 98 774 921 (12 ) 1,781 Other revenues from managed and franchised properties — — 106 2,180 298 — 2,584 Total revenues — — 204 2,954 1,219 (12 ) 4,365 Expenses Owned and leased hotels — — — — 672 — 672 Depreciation and amortization — — 3 118 40 — 161 General and administrative — — 156 — 67 (4 ) 219 Other expenses — — 4 15 15 (8 ) 26 — — 163 133 794 (12 ) 1,078 Other expenses from managed and franchised properties — — 108 2,198 296 — 2,602 Total expenses — — 271 2,331 1,090 (12 ) 3,680 Operating income (loss) — — (67 ) 623 129 — 685 Interest expense — (118 ) (44 ) — (19 ) 3 (178 ) Gain (loss) on foreign currency transactions — — 3 (81 ) 77 — (1 ) Other non-operating income (loss), net — (7 ) 4 12 7 (3 ) 13 Income (loss) before income taxes and equity in earnings from subsidiaries — (125 ) (104 ) 554 194 — 519 Income tax benefit (expense) — 31 27 (134 ) (63 ) — (139 ) Income (loss) before equity in earnings from subsidiaries — (94 ) (77 ) 420 131 — 380 Equity in earnings from subsidiaries 378 472 549 378 — (1,777 ) — Net income 378 378 472 798 131 (1,777 ) 380 Net income attributable to noncontrolling interests — — — — (2 ) — (2 ) Net income attributable to Hilton stockholders $ 378 $ 378 $ 472 $ 798 $ 129 $ (1,777 ) $ 378 Comprehensive income $ 377 $ 417 $ 473 $ 798 $ 90 $ (1,776 ) $ 379 Comprehensive income attributable to noncontrolling interests — — — — (2 ) — (2 ) Comprehensive income attributable to Hilton stockholders $ 377 $ 417 $ 473 $ 798 $ 88 $ (1,776 ) $ 377	Year Ended December 31, 2018 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Revenues Franchise and licensing fees $ — $ — $ 227 $ 1,182 $ 139 $ (18 ) $ 1,530 Base and other management fees — — 1 205 115 — 321 Incentive management fees — — — 78 157 — 235 Owned and leased hotels — — — — 1,484 — 1,484 Other revenues — — 6 81 11 — 98 — — 234 1,546 1,906 (18 ) 3,668 Other revenues from managed and franchised properties — — 245 4,376 617 — 5,238 Total revenues — — 479 5,922 2,523 (18 ) 8,906 Expenses Owned and leased hotels — — — — 1,332 — 1,332 Depreciation and amortization — — 6 237 82 — 325 General and administrative — — 323 — 130 (10 ) 443 Other expenses — — 7 22 30 (8 ) 51 — — 336 259 1,574 (18 ) 2,151 Other expenses from managed and franchised properties — — 236 4,466 621 — 5,323 Total expenses — — 572 4,725 2,195 (18 ) 7,474 Operating income (loss) — — (93 ) 1,197 328 — 1,432 Interest expense — (227 ) (106 ) — (38 ) — (371 ) Gain (loss) on foreign currency transactions — — 4 84 (99 ) — (11 ) Other non-operating income (loss), net — (9 ) 3 16 18 — 28 Income (loss) before income taxes and equity in earnings from subsidiaries — (236 ) (192 ) 1,297 209 — 1,078 Income tax benefit (expense) — 57 39 (309 ) (96 ) — (309 ) Income (loss) before equity in earnings from subsidiaries — (179 ) (153 ) 988 113 — 769 Equity in earnings from subsidiaries 764 943 1,096 764 — (3,567 ) — Net income 764 764 943 1,752 113 (3,567 ) 769 Net income attributable to noncontrolling interests — — — — (5 ) — (5 ) Net income attributable to Hilton stockholders $ 764 $ 764 $ 943 $ 1,752 $ 108 $ (3,567 ) $ 764 Comprehensive income $ 707 $ 784 $ 932 $ 1,751 $ 48 $ (3,510 ) $ 712 Comprehensive income attributable to noncontrolling interests — — — — (5 ) — (5 ) Comprehensive income attributable to Hilton stockholders $ 707 $ 784 $ 932 $ 1,751 $ 43 $ (3,510 ) $ 707	Year Ended December 31, 2017 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Revenues Franchise and licensing fees $ — $ — $ 143 $ 1,077 $ 118 $ (17 ) $ 1,321 Base and other management fees — — 1 195 128 — 324 Incentive management fees — — — 76 146 — 222 Owned and leased hotels — — — — 1,432 — 1,432 Other revenues — — 31 70 11 (7 ) 105 — — 175 1,418 1,835 (24 ) 3,404 Other revenues from managed and franchised properties — — 159 3,986 582 — 4,727 Total revenues — — 334 5,404 2,417 (24 ) 8,131 Expenses Owned and leased hotels — — — — 1,269 — 1,269 Depreciation and amortization — — 5 242 89 — 336 General and administrative — — 327 — 118 (6 ) 439 Other expenses — — 17 29 27 (17 ) 56 — — 349 271 1,503 (23 ) 2,100 Other expenses from managed and franchised properties — — 147 4,147 605 — 4,899 Total expenses — — 496 4,418 2,108 (23 ) 6,999 Gain (loss) on sales of assets, net — — — (1 ) 1 — — Operating income (loss) — — (162 ) 985 310 (1 ) 1,132 Interest expense — (244 ) (61 ) — (47 ) 1 (351 ) Gain (loss) on foreign currency transactions — — 10 124 (131 ) — 3 Loss on debt extinguishment — (60 ) — — — — (60 ) Other non-operating income (loss), net — (3 ) 4 7 21 — 29 Income (loss) before income taxes and equity in earnings from subsidiaries — (307 ) (209 ) 1,116 153 — 753 Income tax benefit (expense) (3 ) 122 26 89 102 — 336 Income (loss) before equity in earnings from subsidiaries (3 ) (185 ) (183 ) 1,205 255 — 1,089 Equity in earnings from subsidiaries 1,087 1,272 1,455 1,087 — (4,901 ) — Net income 1,084 1,087 1,272 2,292 255 (4,901 ) 1,089 Net income attributable to noncontrolling interests — — — — (5 ) — (5 ) Net income attributable to Hilton stockholders $ 1,084 $ 1,087 $ 1,272 $ 2,292 $ 250 $ (4,901 ) $ 1,084 Comprehensive income $ 1,281 $ 1,101 $ 1,288 $ 2,295 $ 419 $ (5,098 ) $ 1,286 Comprehensive income attributable to noncontrolling interests — — — — (5 ) — (5 ) Comprehensive income attributable to Hilton stockholders $ 1,281 $ 1,101 $ 1,288 $ 2,295 $ 414 $ (5,098 ) $ 1,281	Year Ended December 31, 2016 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Revenues Franchise and licensing fees $ — $ — $ 21 $ 974 $ 106 $ (10 ) $ 1,091 Base and other management fees — — — 122 108 — 230 Incentive management fees — — — 16 126 — 142 Owned and leased hotels — — — — 1,434 — 1,434 Other revenues — — 10 61 11 — 82 — — 31 1,173 1,785 (10 ) 2,979 Other revenues from managed and franchised properties — — 32 3,053 512 — 3,597 Total revenues — — 63 4,226 2,297 (10 ) 6,576 Expenses Owned and leased hotels — — — — 1,279 — 1,279 Depreciation and amortization — — 1 266 86 — 353 General and administrative — — 90 203 116 — 409 Other expenses — — 1 31 44 (10 ) 66 — — 92 500 1,525 (10 ) 2,107 Other expenses from managed and franchised properties — — 32 3,083 494 — 3,609 Total expenses — — 124 3,583 2,019 (10 ) 5,716 Gain on sales of assets, net — — — — 8 — 8 Operating income (loss) — — (61 ) 643 286 — 868 Interest expense — (261 ) (14 ) (12 ) (47 ) — (334 ) Gain (loss) on foreign currency transactions — — 11 (150 ) 123 — (16 ) Other non-operating income, net — 1 1 7 13 — 22 Income (loss) from continuing operations before income taxes and equity in losses from subsidiaries — (260 ) (63 ) 488 375 — 540 Income tax benefit (expense) 193 100 26 (297 ) (579 ) — (557 ) Income (loss) from continuing operations before equity in losses from subsidiaries 193 (160 ) (37 ) 191 (204 ) — (17 ) Equity in losses from subsidiaries (220 ) (60 ) (23 ) (220 ) — 523 — Loss from continuing operations, net of taxes (27 ) (220 ) (60 ) (29 ) (204 ) 523 (17 ) Income from discontinued operations, net of taxes 365 365 365 426 375 (1,525 ) 371 Net income 338 145 305 397 171 (1,002 ) 354 Net income attributable to noncontrolling interests — — — — (16 ) — (16 ) Net income attributable to Hilton stockholders $ 338 $ 145 $ 305 $ 397 $ 155 $ (1,002 ) $ 338 Comprehensive income $ 121 $ 143 $ 310 $ 326 $ 21 $ (785 ) $ 136 Comprehensive income attributable to noncontrolling interests — — — — (15 ) — (15 ) Comprehensive income attributable to Hilton stockholders $ 121 $ 143 $ 310 $ 326 $ 6 $ (785 ) $ 121
Condensed Cash Flow Statement [Table Text Block]	Six Months Ended June 30, 2019 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Operating Activities: Net cash provided by (used in) operating activities $ — $ (85 ) $ — $ 675 $ 75 $ (15 ) $ 650 Investing Activities: Capital expenditures for property and equipment — — (5 ) (3 ) (38 ) — (46 ) Capitalized software costs — — — (44 ) — — (44 ) Other — — — 1 (6 ) — (5 ) Net cash used in investing activities — — (5 ) (46 ) (44 ) — (95 ) Financing Activities: Borrowings — 795 1,000 — — — 1,795 Repayment of debt — (1,295 ) (14 ) — (8 ) — (1,317 ) Debt issuance costs — (13 ) (14 ) — — — (27 ) Intercompany transfers 740 598 (933 ) (622 ) 217 — — Dividends paid (87 ) — — — — — (87 ) Repurchases of common stock (653 ) — — — — — (653 ) Intercompany dividends — — — — (15 ) 15 — Share-based compensation tax withholdings and other — — (34 ) — — — (34 ) Net cash provided by (used in) financing activities — 85 5 (622 ) 194 15 (323 ) Effect of exchange rate changes on cash, restricted cash and cash equivalents — — — — 2 — 2 Net increase in cash, restricted cash and cash equivalents — — — 7 227 — 234 Cash, restricted cash and cash equivalents, beginning of period — — 37 32 415 — 484 Cash, restricted cash and cash equivalents, end of period $ — $ — $ 37 $ 39 $ 642 $ — $ 718 Six Months Ended June 30, 2018 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Operating Activities: Net cash provided by (used in) operating activities $ — $ (102 ) $ (8 ) $ 494 $ 148 $ — $ 532 Investing Activities: Capital expenditures for property and equipment — — (4 ) (1 ) (23 ) — (28 ) Capitalized software costs — — — (38 ) — — (38 ) Other — — — (3 ) (6 ) — (9 ) Net cash used in investing activities — — (4 ) (42 ) (29 ) — (75 ) Financing Activities: Borrowings — 150 1,500 — — — 1,650 Repayment of debt — (660 ) — — (12 ) — (672 ) Debt issuance costs — — (21 ) — — — (21 ) Intercompany transfers 1,531 612 (1,451 ) (450 ) (242 ) — — Dividends paid (92 ) — — — — — (92 ) Repurchases of common stock (1,439 ) — — — — — (1,439 ) Share-based compensation tax withholdings and other — — (42 ) — — — (42 ) Net cash provided by (used in) financing activities — 102 (14 ) (450 ) (254 ) — (616 ) Effect of exchange rate changes on cash, restricted cash and cash equivalents — — — — (6 ) — (6 ) Net increase (decrease) in cash, restricted cash and cash equivalents — — (26 ) 2 (141 ) — (165 ) Cash, restricted cash and cash equivalents, beginning of period — — 63 28 579 — 670 Cash, restricted cash and cash equivalents, end of period $ — $ — $ 37 $ 30 $ 438 $ — $ 505	Year Ended December 31, 2018 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Operating Activities: Net cash provided by (used in) operating activities $ — $ (185 ) $ (8 ) $ 1,267 $ 181 $ — $ 1,255 Investing Activities: Capital expenditures for property and equipment — — (9 ) (7 ) (56 ) — (72 ) Payments received on other financing receivables — — — 49 1 — 50 Capitalized software costs — — — (87 ) — — (87 ) Other — — — (6 ) (16 ) — (22 ) Net cash used in investing activities — — (9 ) (51 ) (71 ) — (131 ) Financing Activities: Borrowings — 175 1,500 — 1 — 1,676 Repayment of debt — (985 ) — — (20 ) — (1,005 ) Debt issuance costs — — (21 ) — — — (21 ) Intercompany transfers 1,902 995 (1,444 ) (1,209 ) (244 ) — — Dividends paid (181 ) — — — — — (181 ) Repurchases of common stock (1,721 ) — — — — — (1,721 ) Distributions to noncontrolling interests — — — — (1 ) — (1 ) Tax withholdings on share-based compensation — — (44 ) — — — (44 ) Acquisition of noncontrolling interest — — — (3 ) — — (3 ) Net cash provided by (used in) financing activities — 185 (9 ) (1,212 ) (264 ) — (1,300 ) Effect of exchange rate changes on cash, restricted cash and cash equivalents — — — — (10 ) — (10 ) Net increase (decrease) in cash, restricted cash and cash equivalents — — (26 ) 4 (164 ) — (186 ) Cash, restricted cash and cash equivalents, beginning of period — — 63 28 579 — 670 Cash, restricted cash and cash equivalents, end of period $ — $ — $ 37 $ 32 $ 415 $ — $ 484		Year Ended December 31, 2017 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Operating Activities: Net cash provided by (used in) operating activities $ — $ (113 ) $ (103 ) $ 950 $ 285 $ (170 ) $ 849 Investing Activities: Capital expenditures for property and equipment — — (12 ) (12 ) (34 ) — (58 ) Payments received on other financing receivables — — — 7 — — 7 Capitalized software costs — — — (75 ) — — (75 ) Other — (13 ) — (8 ) 3 (3 ) (21 ) Net cash used in investing activities — (13 ) (12 ) (88 ) (31 ) (3 ) (147 ) Financing Activities: Borrowings — 1,822 — — 2 — 1,824 Repayment of debt — (1,852 ) — — (8 ) — (1,860 ) Debt issuance costs and redemption premium — (69 ) — — — — (69 ) Repayment of intercompany borrowings — — (3 ) — — 3 — Intercompany transfers 1,086 225 122 (865 ) (568 ) — — Dividends paid (195 ) — — — — — (195 ) Intercompany dividends — — — — (170 ) 170 — Cash transferred in spin-offs of Park and HGV — — — — (501 ) — (501 ) Repurchases of common stock (891 ) — — — — — (891 ) Distributions to noncontrolling interests — — — — (1 ) — (1 ) Tax withholdings on share-based compensation — — (31 ) — — — (31 ) Net cash provided by (used in) financing activities — 126 88 (865 ) (1,246 ) 173 (1,724 ) Effect of exchange rate changes on cash, restricted cash and cash equivalents — — — — 8 — 8 Net decrease in cash, restricted cash and cash equivalents — — (27 ) (3 ) (984 ) — (1,014 ) Cash, restricted cash and cash equivalents from continuing operations, beginning of period — — 90 31 1,062 — 1,183 Cash, restricted cash and cash equivalents from discontinued operations, beginning of period — — — — 501 — 501 Cash, restricted cash and cash equivalents, beginning of period — — 90 31 1,563 — 1,684 Cash, restricted cash and cash equivalents, end of period $ — $ — $ 63 $ 28 $ 579 $ — $ 670 Year Ended December 31, 2016 Parent HWF Issuers HOC Guarantors Non-Guarantors Eliminations Total (in millions) Operating Activities: Net cash provided by (used in) operating activities $ — $ (37 ) $ — $ 866 $ 1,086 $ (605 ) $ 1,310 Investing Activities: Capital expenditures for property and equipment — — — (9 ) (308 ) — (317 ) Payments received on other financing receivables — — — 2 1 — 3 Issuance of intercompany receivables — — — (192 ) (42 ) 234 — Payments received on intercompany receivables — — — 192 — (192 ) — Capitalized software costs — — — (73 ) (8 ) — (81 ) Other — (6 ) — (37 ) 15 — (28 ) Net cash used in investing activities — (6 ) — (117 ) (342 ) 42 (423 ) Financing Activities: Borrowings — — 1,000 — 3,715 — 4,715 Repayment of debt — (266 ) — — (4,093 ) — (4,359 ) Debt issuance costs — (17 ) (20 ) — (39 ) — (76 ) Intercompany borrowings — — — 42 192 (234 ) — Repayment of intercompany borrowings — — — — (192 ) 192 — Intercompany transfers 277 326 (890 ) (854 ) 1,141 — — Dividends paid (277 ) — — — — — (277 ) Intercompany dividends — — — — (605 ) 605 — Distributions to noncontrolling interests — — — — (32 ) — (32 ) Tax withholdings on share-based compensation — — — (15 ) — — (15 ) Net cash provided by (used in) financing activities — 43 90 (827 ) 87 563 (44 ) Effect of exchange rate changes on cash, restricted cash and cash equivalents — — — — (15 ) — (15 ) Net increase (decrease) in cash, restricted cash and cash equivalents — — 90 (78 ) 816 — 828 Cash, restricted cash and cash equivalents from continuing operations, beginning of period — — — 109 524 — 633 Cash, restricted cash and cash equivalents from discontinued operations, beginning of period — — — — 223 — 223 Cash, restricted cash and cash equivalents, beginning of period — — — 109 747 — 856 Cash, restricted cash and cash equivalents from continuing operations, end of period — — 90 31 1,062 — 1,183 Cash, restricted cash and cash equivalents from discontinued operations, end of period — — — — 501 — 501 Cash, restricted cash and cash equivalents, end of period $ — $ — $ 90 $ 31 $ 1,563 $ — $ 1,684

Selected Quarterly Financial _2

Selected Quarterly Financial Information (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information	The following table sets forth the historical unaudited quarterly financial data for the periods indicated. The information for each of these periods has been prepared on the same basis as the audited consolidated financial statements and, in our opinion, reflects all adjustments necessary to fairly present our financial results. Operating results for previous periods do not necessarily indicate results that may be achieved in any future period. 2018 First Quarter Second Quarter Third Quarter Fourth Quarter Year (in millions, except per share data) Revenues $ 2,074 $ 2,291 $ 2,253 $ 2,288 $ 8,906 Operating income 279 406 385 362 1,432 Net income 163 217 164 225 769 Net income attributable to Hilton stockholders 161 217 162 224 764 Basic earnings per share (1) $ 0.51 $ 0.72 $ 0.55 $ 0.76 $ 2.53 Diluted earnings per share (1) $ 0.51 $ 0.71 $ 0.54 $ 0.75 $ 2.50 2017 First Quarter Second Quarter Third Quarter Fourth Quarter Year (in millions, except per share data) Revenues $ 1,896 $ 2,076 $ 2,091 $ 2,068 $ 8,131 Operating income 217 324 332 259 1,132 Net income 48 151 160 730 1,089 Net income attributable to Hilton stockholders 47 150 158 729 1,084 Basic earnings per share (1) $ 0.14 $ 0.46 $ 0.49 $ 2.29 $ 3.34 Diluted earnings per share (1) $ 0.14 $ 0.46 $ 0.49 $ 2.27 $ 3.32 ____________ (1) The sum of the earnings per share for the four quarters differs from annual earnings per share due to the required method of computing the weighted average shares outstanding in interim periods.

Organization (Details)

Organization (Details) shares in Millions	Jun. 30, 2019RoomCountryHotel	Dec. 31, 2018RoomCountryHotel	Mar. 15, 2017Rateshares
Organization and basis of presentation [Line Items]
Number of hotels and resorts, properties | Hotel	5,872	5,685
Number of hotels and resorts, rooms | Room	939,297	912,960
Number of Countries in which Entity Operates | Country	114	113
HNA Tourism Group Co., Ltd. [Member]
Organization and basis of presentation [Line Items]
Common stock acquired | shares			82.5
HNA Tourism Group Co., Ltd. [Member]
Organization and basis of presentation [Line Items]
Common Stock Ownership Percentage | Rate			25.00%

Basis of Presentation and Sum_4

Basis of Presentation and Summary of Significant Accounting Policies Additional Information (Details) - USD ($) $ in Millions	Jan. 01, 2019	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2016
Property, Plant and Equipment [Line Items]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage			50.00%
Management and franchise contracts, net		$ 817	$ 872	$ 953
Accounting standards update 2014-09
Property, Plant and Equipment [Line Items]
Management and franchise contracts, net				$ 44
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets					$ 212	$ 212
Accounting Standards Update 2016-02 [Member]
Property, Plant and Equipment [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 256	$ (256)
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle	81
Accounting standards update 2018-02
Property, Plant and Equipment [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			$ 0
Employee Stock Option [Member]
Property, Plant and Equipment [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		10 years	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years	3 years
Performance Shares [Member]
Property, Plant and Equipment [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights			zero percent to 200 percent
EBITDA CAGR [Member]
Property, Plant and Equipment [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			50.00%
Free cash flow CAGR [Member]
Property, Plant and Equipment [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			50.00%
Minimum [Member] | Restricted Stock Units (RSUs) [Member]
Property, Plant and Equipment [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		2 years	2 years
Minimum [Member] | Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life			8 years
Minimum [Member] | Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life			3 years
Minimum [Member] | Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life			3 years
Maximum [Member] | Restricted Stock Units (RSUs) [Member]
Property, Plant and Equipment [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years	3 years
Maximum [Member] | Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life			40 years
Maximum [Member] | Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life			8 years
Maximum [Member] | Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life			5 years
Management contracts [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life			13 years
Management contracts [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life			16 years
Management contract acquisition costs [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life			20 years
Management contract acquisition costs [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life			30 years
Franchise contracts [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life			12 years
Franchise contracts [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life			13 years
Franchise contract acquisition costs [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life			10 years
Franchise contract acquisition costs [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life			20 years
Lease Agreements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life			12 years
Lease Agreements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life			35 years
Hilton Honors Intangible [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life			16 years
Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Finite-Lived Intangible Asset, Useful Life			3 years
Accumulated other comprehensive loss | Accounting standards update 2018-02
Property, Plant and Equipment [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			$ 16
Assets [Member] | Minimum [Member] | Accounting Standards Update 2016-02 [Member]
Property, Plant and Equipment [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	900
Assets [Member] | Maximum [Member] | Accounting Standards Update 2016-02 [Member]
Property, Plant and Equipment [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	1,100
Liability [Member] | Minimum [Member] | Accounting Standards Update 2016-02 [Member]
Property, Plant and Equipment [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	1,200
Liability [Member] | Maximum [Member] | Accounting Standards Update 2016-02 [Member]
Property, Plant and Equipment [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 1,400

Basis of Presentation and Sum_5

Basis of Presentation and Summary of Significant Accounting Policies Prior Period Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended									6 Months Ended		12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2019	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net of allowance for doubtful accounts	$ 1,190	$ 1,150				$ 1,005				$ 1,190		$ 1,150	$ 1,005
Prepaid expenses	117	160				127				117		160	127
Other	190	169				169				190		169	169
Management and franchise contracts, net	817	872				953				817		872	953
Deferred income tax assets	146	90				111				146		90	111
Other	222	239				291				222		239	291
Assets	15,140	13,995				14,228				15,140		13,995	14,228
Accounts payable, accrued expenses and other	1,657	1,530				1,416				1,657		1,530	1,416
Current portion of deferred revenues	298	350				366				298		350	366
Customer Loyalty Program Liability, Current		700				622						700	622
Deferred revenue	822	826				829				822		826	829
Deferred income tax liabilities	861	898				931				861		898	931
Other	876	863				920				876		863	920
Liabilities	15,163	13,437				12,537				15,163		13,437	12,537
Accumulated deficit	(6,342)	(6,417)				(6,981)				(6,342)		(6,417)	(6,981)
Accumulated other comprehensive loss	(806)	(782)				(741)				(806)		(782)	(741)
Total equity (deficit)	(23)	558		$ 560	$ 1,747	1,691				(23)	$ 560	558	1,691	$ 5,627	$ 108	$ 5,951
Total liabilities and equity	15,140	13,995				14,228				15,140		13,995	14,228
Revenue from Contract with Customer, Excluding Assessed Tax	2,484	2,288	$ 2,253	2,291	2,074	2,068	$ 2,091	$ 2,076	$ 1,896	4,688	4,365	8,906	8,131	6,576
Depreciation and amortization	86			79						170	161		336	353
General and Administrative Expense	113			115						220	219	443	439	409
Other Expenses	15			12						35	26	51	56	66
Total expenses excluding reimbursable expenses	548			558						1,057	1,078	2,151	2,100	2,107
Total expenses	2,006			1,885						3,898	3,680	7,474	6,999	5,716
Gain on sale of assets, net												0	0	8
Operating income	478	362	385	406	279	259	332	324	217	790	685	1,432	1,132	868
Interest expense	(101)			(95)						(199)	(178)	(371)	(351)	(334)
Gain (loss) on foreign currency transactions	(3)			(12)						(3)	(1)	(11)	3	(16)
Loss on debt extinguishment												0	60	0
Other non-operating income, net	(12)			(1)						(8)	13	28	29	22
Income from continuing operations before income taxes	362			298						580	519	1,078	753	540
Income Tax Expense (Benefit)	(101)			(81)						(160)	(139)	(309)	336	(557)
Net income	261	225	164	217	163	730	160	151	48	420	380	769	1,089	354
Net income attributable to noncontrolling interest	(1)			0						(2)	(2)	(5)	(5)	(16)
Net income attributable to Hilton stockholders	$ 260	$ 224	$ 162	$ 217	$ 161	$ 729	$ 158	$ 150	$ 47	$ 418	$ 378	$ 764	$ 1,084	$ 338
Earnings Per Share, Basic	$ 0.90	$ 0.76	$ 0.55	$ 0.72	$ 0.51	$ 2.29	$ 0.49	$ 0.46	$ 0.14	$ 1.43	$ 1.22	$ 2.53	$ 3.34	$ 1.03
Net income per share, diluted	$ 0.89	$ 0.75	$ 0.54	$ 0.71	$ 0.51	$ 2.27	$ 0.49	$ 0.46	$ 0.14	$ 1.42	$ 1.21	$ 2.50	$ 3.32	$ 1.03
Income (loss) from continuing operations, net of taxes												$ 769	$ 1,089	$ (17)
Income from discontinued operations, net of taxes												$ 0	$ 0	$ 371
Net income (loss) from continuing operations per share												$ 2.53	$ 3.34	$ (0.08)
Net income from discontinued operations per share												0	0	1.11
Net income (loss) from continuing operations per share												2.50	3.32	(0.08)
Net income from discontinued operations per share												$ 0	$ 0	$ 1.11
Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net of allowance for doubtful accounts						$ 998							$ 998
Prepaid expenses						111							111
Other						171							171
Management and franchise contracts, net						909							909
Deferred income tax assets						113							113
Other						434							434
Assets						14,308							14,308
Accounts payable, accrued expenses and other						1,487							1,487
Current portion of deferred revenues						41							41
Customer Loyalty Program Liability, Current						622							622
Deferred revenue						97							97
Deferred income tax liabilities						1,063							1,063
Other						1,470							1,470
Liabilities						12,233							12,233
Accumulated deficit						(6,596)							(6,596)
Accumulated other comprehensive loss						(742)							(742)
Total equity (deficit)						2,075							2,075
Total liabilities and equity						14,308							14,308
Revenue from Contract with Customer, Excluding Assessed Tax													9,140	$ 7,382
Depreciation and amortization													347	364
General and Administrative Expense													434	403
Other Expenses													56	66
Total expenses excluding reimbursable expenses													2,123	2,128
Total expenses													7,768	6,438
Gain on sale of assets, net														8
Operating income													1,372	952
Interest expense													(408)	(394)
Gain (loss) on foreign currency transactions													3	(16)
Loss on debt extinguishment													60
Other non-operating income, net													23	14
Income from continuing operations before income taxes													930	556
Income Tax Expense (Benefit)													334	(564)
Net income													1,264	364
Net income attributable to noncontrolling interest													(5)	(16)
Net income attributable to Hilton stockholders													$ 1,259	$ 348
Earnings Per Share, Basic													$ 3.88	$ 1.06
Net income per share, diluted													$ 3.85	$ 1.06
Income (loss) from continuing operations, net of taxes														$ (8)
Income from discontinued operations, net of taxes														$ 372
Net income (loss) from continuing operations per share														$ (0.05)
Net income from discontinued operations per share														1.11
Net income (loss) from continuing operations per share														(0.05)
Net income from discontinued operations per share														$ 1.11
Accounting standards update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net of allowance for doubtful accounts						7							$ 7
Prepaid expenses						16							16
Other						(2)							(2)
Management and franchise contracts, net						44							44
Deferred income tax assets						(2)							(2)
Other						(143)							(143)
Assets						(80)							(80)
Accounts payable, accrued expenses and other						(71)							(71)
Current portion of deferred revenues						325							325
Customer Loyalty Program Liability, Current						0							0
Deferred revenue						732							732
Deferred income tax liabilities						(132)							(132)
Other						(550)							(550)
Liabilities						304							304
Accumulated deficit						(385)							(385)
Accumulated other comprehensive loss						1							1
Total equity (deficit)						(384)							(384)
Total liabilities and equity						(80)							(80)
Revenue from Contract with Customer, Excluding Assessed Tax													(1,009)	$ (806)
Depreciation and amortization													(11)	(11)
General and Administrative Expense													0	0
Other Expenses													0	0
Total expenses excluding reimbursable expenses													(29)	(29)
Total expenses													(775)	(730)
Gain on sale of assets, net														0
Operating income													(234)	(76)
Interest expense													57	60
Gain (loss) on foreign currency transactions													0	0
Loss on debt extinguishment													0
Other non-operating income, net													0	0
Income from continuing operations before income taxes													(177)	(16)
Income Tax Expense (Benefit)													2	7
Net income													(175)	(10)
Net income attributable to noncontrolling interest													0	0
Net income attributable to Hilton stockholders													(175)	(10)
Income (loss) from continuing operations, net of taxes														(9)
Income from discontinued operations, net of taxes														(1)
Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													0	0
Depreciation and amortization													0	0
General and Administrative Expense													5	6
Other Expenses													0	0
Total expenses excluding reimbursable expenses													6	8
Total expenses													6	8
Gain on sale of assets, net														0
Operating income													(6)	(8)
Interest expense													0	0
Gain (loss) on foreign currency transactions													0	0
Loss on debt extinguishment													0
Other non-operating income, net													6	8
Income from continuing operations before income taxes													0	0
Income Tax Expense (Benefit)													0	0
Net income													0	0
Net income attributable to noncontrolling interest													0	0
Net income attributable to Hilton stockholders													0	0
Income (loss) from continuing operations, net of taxes														0
Income from discontinued operations, net of taxes														0
Franchise and licensing fees
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 444			$ 404						$ 826	$ 735	$ 1,530	1,321	1,091
Franchise and licensing fees | Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													1,382	1,154
Franchise and licensing fees | Accounting standards update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													(61)	(63)
Franchise and licensing fees | Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													0	0
Base and other management fees
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	89			84						169	161	321	324	230
Base and other management fees | Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													336	242
Base and other management fees | Accounting standards update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													(12)	(12)
Base and other management fees | Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													0	0
Incentive management fees
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	58			59						113	114	235	222	142
Incentive management fees | Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													222	142
Incentive management fees | Accounting standards update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													0	0
Incentive management fees | Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													0	0
Hotel, Owned
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	387			392						699	726	1,484	1,432	1,434
Expenses	334			352						632	672	1,332	1,269	1,279
Hotel, Owned | Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													1,450	1,452
Expenses													1,286	1,295
Hotel, Owned | Accounting standards update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													(18)	(18)
Expenses													(18)	(18)
Hotel, Owned | Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													0	0
Expenses													1	2
Hotel, Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	26			22						52	45	98	105	82
Hotel, Other | Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													105	82
Hotel, Other | Accounting standards update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													0	0
Hotel, Other | Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													0	0
Total revenues excluding reimbursable revenues
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,004			961						1,859	1,781	3,668	3,404	2,979
Total revenues excluding reimbursable revenues | Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													3,495	3,072
Total revenues excluding reimbursable revenues | Accounting standards update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													(91)	(93)
Total revenues excluding reimbursable revenues | Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													0	0
Other revenues from managed and franchised properties
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,480			1,330						2,829	2,584	5,238	4,727	3,597
Other revenues from managed and franchised properties | Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													5,645	4,310
Other revenues from managed and franchised properties | Accounting standards update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													(918)	(713)
Other revenues from managed and franchised properties | Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													0	0
Other expenses from managed and franchised properties
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expenses	1,458			1,327						2,841	2,602	5,323	4,899	3,609
Other expenses from managed and franchised properties | Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expenses													5,645	4,310
Other expenses from managed and franchised properties | Accounting standards update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expenses													(746)	(701)
Other expenses from managed and franchised properties | Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expenses													0	0
Accumulated other comprehensive loss
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated other comprehensive loss	$ (806)	$ (782)		$ (742)		$ (741)				$ (806)	$ (742)	$ (782)	$ (741)	$ (1,001)		$ (784)

Discontinued Operations Additio

Discontinued Operations Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jan. 03, 2017
Park and HGV spin-offs [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Distribution of spin-off companies stock to stockholders			100.00%
Park and HGV spin-offs [Member] | Transition Services Agreement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Period of continuing involvement after disposal		2 years
HGV spin-off [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Spin-off company common stock distributed for every ten shares of the Company's common stock			1
Common stock to receive for spin-off company common stock			10
HGV spin-off [Member] | Franchise and licensing fees
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues from discontinued operations after disposal	$ 98	$ 87
HGV spin-off [Member] | Licensing Agreements [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Period of continuing involvement after disposal		100 years
Royalty fee rate		5.00%
Park spin-off [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Spin-off company common stock distributed for every five shares of the Company's common stock			1
Common stock to receive for spin-off company common stock			5
Park spin-off [Member] | Management and franchise
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues from discontinued operations after disposal	154	$ 157
Park spin-off [Member] | Other revenue from managed and franchised properties [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues from discontinued operations after disposal	$ 1,167	$ 1,197

Discontinued Operations Income

Discontinued Operations Income Statement Disclosures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations, net of taxes	$ 0	$ 0	$ 371
Park and HGV spin-offs [Member] | Spin-offs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues from discontinued operations			4,236
Owned and leased hotels			1,770
Timeshare			942
Depreciation and amortization			320
Other expenses			298
Total expenses from discontinued operations			3,330
Gain on sales of assets, net			1
Operating income from discontinued operations			907
Non-operating loss, net			(210)
Income from discontinued operations before taxes			697
Income tax expense			(326)
Income from discontinued operations, net of taxes			371
Income from discontinued operations attributable to noncontrolling interests, net of taxes			(6)
Income from discontinued operations attributable to Hilton stockholders, net of taxes			$ 365

Discontinued Operations Stateme

Discontinued Operations Statement of Cash Flow Disclosures (Details) - Park and HGV spin-offs [Member] - Spin-offs $ in Millions	12 Months Ended
	Dec. 31, 2016USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation and amortization	$ 320
Gain on sale of assets, net	(1)
Capital expenditure for property and equipment	$ (255)

Revenues from Contracts with _3

Revenues from Contracts with Customers Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Contract with Customer, Liability, Revenue Recognized	$ (78)	$ (56)	$ (135)	$ (116)	$ 229	$ 132	$ 211
Loyalty Program Revenues [Member]
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 438		$ 438		$ 471
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	2 years		2 years		2 years
Application, initiation and other fees [Member]
Disaggregation of Revenue [Line Items]
Revenue, Remaining Performance Obligation, Amount	$ 615		$ 615		$ 589

Revenues from Contracts with _4

Revenues from Contracts with Customers Revenues from Contracts with Customers - Contract Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue from Contract with Customer [Abstract]
Contract with Customer, Liability, beginning balance			$ 1,060	$ 1,087	$ 1,087
Deferred Revenue, Additions			220		377
Contract with Customer, Liability, Revenue Recognized	$ (78)	$ (56)	(135)	$ (116)	229	$ 132	$ 211
Reclassification from deferred revenues due to change in estimated transaction price			(92)		175
Contract with Customer, Liability, ending balance	$ 1,053		$ 1,053		$ 1,060	$ 1,087

Consolidated Variable Interes_3

Consolidated Variable Interest Entities (Details) $ in Millions	Jun. 30, 2019USD ($)Entity	Jun. 01, 2019USD ($)	Dec. 31, 2018USD ($)Entity	Dec. 31, 2017USD ($)Entity
Variable Interest Entity [Line Items]
Number Of Consolidated Variable Interest Entities | Entity			3
Assets	$ 15,140		$ 13,995	$ 14,228
Liabilities	$ 15,163		$ 13,437	$ 12,537
Leased Hotel VIEs [Member]
Variable Interest Entity [Line Items]
Number Of Consolidated Variable Interest Entities | Entity	2		2
Hotel VIEs [Member]
Variable Interest Entity [Line Items]
Number Of Consolidated Variable Interest Entities | Entity			2	2
Management Company [Member]
Variable Interest Entity [Line Items]
Number Of Consolidated Variable Interest Entities | Entity			1	1
Assets		$ 7
Liabilities		$ 3
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
Variable Interest Entity [Line Items]
Capital Lease Obligations			$ 187	$ 191

Consolidated Variable Interes_4

Consolidated Variable Interest Entities Consolidated Variable Interest Entities - Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Finance Lease, Liability	$ 260
Cash and cash equivalents	635	$ 403	$ 570
Accounts receivable, net of allowance for doubtful accounts	1,190	1,150	1,005
Property, Plant and Equipment, Net	418	367	353
Deferred income tax assets	146	90	111
Other	222	239	291
Accounts payable, accrued expenses and other	1,657	1,530	1,416
Long-term Debt and Capital Lease Obligations	7,772	7,266	6,556
Other	876	863	920
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member]
Variable Interest Entity [Line Items]
Finance Lease, Liability	186	187
Cash and cash equivalents	72	71	73
Accounts receivable, net of allowance for doubtful accounts		15	16
Property, Plant and Equipment, Net	73	68	57
Deferred income tax assets	51	53	56
Other	61	58	57
Accounts payable, accrued expenses and other	52	41	43
Long-term Debt	204	205
Long-term Debt and Capital Lease Obligations		205	212
Other	$ 15	$ 15	$ 13

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Goodwill at period start	$ 5,190	$ 5,218
Spin-off of Park		91
Foreign currency translation	(30)	63
Goodwill at period end	5,160	5,190
Ownership [Member]
Goodwill [Roll Forward]
Goodwill at period start	104	184
Spin-off of Park		91
Foreign currency translation	(5)	11
Goodwill at period end	99	104
Management and franchise
Goodwill [Roll Forward]
Goodwill at period start	5,086	5,034
Spin-off of Park		0
Foreign currency translation	(25)	52
Goodwill at period end	$ 5,061	$ 5,086

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets Goodwill Impairment Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2019	Dec. 31, 2016
Goodwill [Line Items]
Net Carrying Value	$ 5,160	$ 5,190	$ 5,157	$ 5,218
Spin-off of Park		91
Foreign currency translation	(30)	63
Ownership [Member]
Goodwill [Line Items]
Gross Carrying Value	439	444		856
Accumulated Impairment Losses	(340)	(340)		(672)
Net Carrying Value	99	104		$ 184
Spin-off of Park		423
Accumulated impairment losses, disposed of related to sale of a business		332
Spin-off of Park		91
Foreign currency translation	$ (5)	$ 11

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 2,902	$ 2,861	$ 2,755
Accumulated Amortization	2,085	1,989	1,802
Net Carrying Value	817	872	953
Gross Carrying Value	1,206	1,167	1,265
Accumulated Amortization	806	752	832
Net Carrying Value	400	415	433
Management and Franchise Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2,232	2,228	2,242
Accumulated Amortization	1,960	1,873	1,716
Net Carrying Value	272	355	526
Contract-Based Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	548	525	416
Accumulated Amortization	108	101	74
Net Carrying Value	440	424	342
Capitalized Contract Cost [Domain]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	122	108	97
Accumulated Amortization	17	15	12
Net Carrying Value	105	93	85
Lease Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	287	288	301
Accumulated Amortization	167	161	153
Net Carrying Value	120	127	148
Software and Software Development Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	547	503	585
Accumulated Amortization	358	321	428
Net Carrying Value	189	182	157
Hilton Honors Intangible [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	338	338	341
Accumulated Amortization	247	236	217
Net Carrying Value	91	102	124
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	34	38	38
Accumulated Amortization	34	34	34
Net Carrying Value	$ 0	$ 4	$ 4

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets Amortization of Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Depreciation and amortization [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 71	$ 66	$ 141	$ 135	$ 271	$ 277	$ 301
Depreciation and amortization [Member] | Intangible assets recorded at fair value at the time of the Merger [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	51	52	102	103	204	206	208
Depreciation and amortization [Member] | Software and Software Development Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets					62	67	87
Franchise fee and base and other management fee revenues [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 7	$ 7	$ 14	$ 14	$ 27	$ 17	$ 16

Goodwill and Intangible Asset_6

Goodwill and Intangible Assets Estimated Future Amoritzation (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Depreciation and amortization [Member]
Finite-Lived Intangible Assets [Line Items]
2019 (remaining)	$ 141
2019		$ 279
2020	250	236
2021	110	97
2022	81	66
2023	51	48
Thereafter	144	137
Total intangible assets	777	863
Franchise fee and base and other management fee revenues [Member]
Finite-Lived Intangible Assets [Line Items]
2019 (remaining)	13
2019		27
2020	26	25
2021	25	24
2022	23	22
2023	23	22
Thereafter	330	304
Total intangible assets	$ 440	$ 424

Property and Equipment Property

Property and Equipment Property and Equipment - Property and Equipment (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Land		$ 12	$ 12
Buildings And Leasehold Improvements		456	428
Furniture And Equipment		356	346
Construction in Progress, Gross		24	17
Property, Plant and Equipment, Gross		848	803
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment		481	450
Property, Plant and Equipment, Net	$ 418	$ 367	$ 353

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Capital Leases, Balance Sheet, Assets by Major Class, Net	$ 65	$ 68
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	45	43
Depreciation, Nonproduction	$ 54	$ 59	$ 52

Accounts Payable, Accrued Exp_3

Accounts Payable, Accrued Expenses and Other (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Employee-related Liabilities, Current		$ 532	$ 502
Accounts Payable, Current		283	282
Self Insurance Reserve, Current		199	189
Other Accrued Liabilities, Current		516	443
Accounts Payable and Accrued Liabilities, Current	$ 1,657	$ 1,530	$ 1,416

Debt (Details)

Debt (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Apr. 01, 2018	Dec. 31, 2017	Mar. 01, 2017
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 7,897	$ 7,361		$ 6,683
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(88)	(79)		(81)
Long-term Debt and Capital Lease Obligations, Current	(37)	(16)		(46)
Long-term Debt and Capital Lease Obligations	7,772	7,266		6,556
Senior secured term loan facility due 2026 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 2,619	3,119
Debt Instrument, Interest Rate, Stated Percentage	4.15%
Senior notes due 2024 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 1,000	$ 1,000		1,000
Debt Instrument, Interest Rate, Stated Percentage	4.25%	4.25%
Senior notes due 2025 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 900	$ 900		900
Debt Instrument, Interest Rate, Stated Percentage	4.625%	4.625%			4.625%
Senior notes due 2026 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 1,500	$ 1,500		0
Debt Instrument, Interest Rate, Stated Percentage	5.125%	5.125%	5.125%
Senior notes due 2027 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 600	$ 600		600
Debt Instrument, Interest Rate, Stated Percentage	4.875%	4.875%			4.875%
Senior notes due 2030 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 1,000	$ 0
Debt Instrument, Interest Rate, Stated Percentage	4.875%
Senior secured term loan facility due 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 3,119		3,929
Debt Instrument, Interest Rate, Stated Percentage		4.26%
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 260	$ 225		233
Debt, Weighted Average Interest Rate		6.43%
Long-term Debt, Weighted Average Interest Rate, at Point in Time	5.80%
Other Debt Obligations [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 18	$ 17		$ 21
Debt, Weighted Average Interest Rate		3.08%
Long-term Debt, Weighted Average Interest Rate, at Point in Time	3.08%

Debt Additional Information (De

Debt Additional Information (Details) - USD ($) shares in Millions, $ in Millions	Apr. 01, 2018	Feb. 12, 2019	Mar. 31, 2017	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Mar. 01, 2017
Debt Instrument [Line Items]
Treasury Stock, Value, Acquired, Cost Method				$ 383		$ 1,329	$ 679	$ 1,439	$ 1,721	$ 891
Proceeds from Lines of Credit		$ 100							150
Long-term Debt, Gross				$ 7,897	$ 7,361		$ 7,897		7,361	6,683
Senior secured term loan facility due 2026 [Member]
Debt Instrument [Line Items]
Debt Discount, Percent				0.25%			0.25%
Debt Instrument, Interest Rate, Stated Percentage				4.15%			4.15%
Debt Issuance Costs, Gross				$ 2			$ 2
Repayments of Debt							500
Write off of Deferred Debt Issuance Cost							8
Long-term Debt, Gross				$ 2,619	$ 3,119		$ 2,619		$ 3,119
Senior notes due 2026 [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Long-term Debt	$ 1,500
Debt Instrument, Interest Rate, Stated Percentage	5.125%			5.125%	5.125%		5.125%		5.125%
Debt Issuance Costs, Gross	$ 21
Long-term Debt, Gross				$ 1,500	$ 1,500		$ 1,500		$ 1,500	0
Senior secured term loan facility due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					4.26%				4.26%
Repayments of Long-term Debt	$ 500				$ 300
Debt Instrument, Unamortized Discount					8				$ 8
Debt Instrument, Interest Rate, Increase (Decrease)	0.25%
Debt Instrument, Basis Spread on Variable Rate	1.75%
Long-term Debt, Gross					$ 3,119				$ 3,119	3,929
Senior notes due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				4.625%	4.625%		4.625%		4.625%		4.625%
Long-term Debt, Gross				$ 900	$ 900		$ 900		$ 900	900
Senior notes due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				4.875%	4.875%		4.875%		4.875%		4.875%
Long-term Debt, Gross				$ 600	$ 600		$ 600		$ 600	600
Senior notes due 2021 [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt			$ 1,500
Premium paid to redeem debt instrument										42
Write off of Deferred Debt Issuance Cost										18
Senior notes due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				4.25%	4.25%		4.25%		4.25%
Long-term Debt, Gross				$ 1,000	$ 1,000		$ 1,000		$ 1,000	$ 1,000
Senior secured revolving credit facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					1,000				1,000
Letters of Credit Outstanding, Amount					63				63
Line of Credit Facility, Remaining Borrowing Capacity					937				$ 937
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage									0.125%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Issuance Costs, Gross				7			7
Repayments of Debt							225
Line of Credit Facility, Maximum Borrowing Capacity				1,750			1,750
Line of Credit Facility, Remaining Borrowing Capacity				$ 1,690			$ 1,690
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage							0.125%
Senior notes due 2030 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				4.875%			4.875%
Debt Issuance Costs, Gross				$ 13			$ 13
Long-term Debt, Gross				1,000	$ 0		1,000		$ 0
Other stockholder [Member]
Debt Instrument [Line Items]
Treasury Stock, Shares, Acquired	16.5
Treasury Stock, Value, Acquired, Cost Method	$ 1,171
Letter of Credit [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				250			250
Letters of Credit Outstanding, Amount				$ 59			$ 59

Debt Debt Maturities (Details)

Debt Debt Maturities (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal Remainder of Fiscal Year	$ 19
Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months		$ 16
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two	35	17
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three	28	18
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four	20	19
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five	21	3,139
Thereafter	7,774	4,152
Long-term Debt, Gross	$ 7,897	$ 7,361	$ 6,683

Other Liabilities (Details)

Other Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2019	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Pension obligations	$ 145		$ 165
Other long-term tax liabilities	395		397
Deferred employee compensation and benefits	113		117
Insurance reserves	146		162
Other	64		79
Other liabilities	$ 863	$ 876	$ 920
Insurance Claims, Satisfied Average Term	three years

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities (Details)	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)Derivative	May 01, 2018USD ($)	Mar. 01, 2017USD ($)Derivative
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$ 0	$ 0	$ 0
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 98,000,000
Derivative, Remaining Maturity	24 years
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 412,000,000
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount			$ 1,450,000,000
Number of Interest Rate Derivatives Held | Derivative			4
Derivative, Swaption Interest Rate			1.87%
Interest Rate Swaps Maturing 2022 [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Number of Interest Rate Derivatives Entered Into | Derivative					2
$1.6 billion notional [Member] | Interest Rate Swaps Maturing 2022 [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount					$ 1,600,000,000
Derivative, Swaption Interest Rate					1.98%
$1.6 billion notional [Member] | Interest Rate Swaps Maturing 2023 [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount				$ 1,600,000,000
Derivative, Swaption Interest Rate				3.03%
$750 million notional [Member] | Interest Rate Swaps Maturing 2022 [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount					$ 750,000,000
Proceeds received for settlement of interest rate swap	$ 18,000,000
Derivative, Swaption Interest Rate					2.02%
Franchise [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative instruments, gain (loss) reclassified from accumulated OCI into income, effective portion	less than $1 million	less than $1 million

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Asset	$ 16	$ 11
Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Asset	1	0
Designated as Hedging Instrument [Member] | Accounts Payable and Accrued Liabilities [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Liability	0	1
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Asset	1	4
Not Designated as Hedging Instrument [Member] | Accounts Payable and Accrued Liabilities [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative Liability	$ 2	$ 1

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities Earnings Effect of Derivative Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ 22	$ (5)	$ (15)
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	2	(1)
Interest Expense [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(1)	(16)	(8)
Interest Expense [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Gain (Loss) Reclassified to Earnings, Net from Discontinued Cash Flow Hedges	(5)	(10)	(4)
Other Nonoperating Income (Expense) [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments		2	4
Foreign Currency Gain (Loss) [Member] | Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Derivative [Line Items]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ (9)	$ 12	$ 7

Fair Value Estimates (Details)

Fair Value Estimates (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	$ 5,149	$ 3,809	$ 2,575
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	265	87
Cash Equivalents		87	284
Restricted Cash Equivalents, Current	19	18	12
Interest Rate Derivative Assets, at Fair Value		16
Interest Rate Derivative Liabilities, at Fair Value	35
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt	2,624	3,039	3,954
Reported Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Equivalents, at Carrying Value	265	87	284
Restricted Cash Equivalents, Current	19	18	12
Interest Rate Derivative Assets, at Fair Value		16
Long-term Debt	7,531	$ 7,040	$ 6,348
Interest Rate Derivative Liabilities, at Fair Value	$ 35

Leases (Details)

Leases (Details)	Jun. 30, 2019Hotel	Dec. 31, 2018HotelEntity	Dec. 31, 2017HotelEntity
Leases [Abstract]
Property Subject to or Available for Operating Lease, Number of Units		58	59
Capital Leased Assets, Number of Units		4	4
Number Of Consolidated Variable Interest Entities Capital Leases | Entity		2	2
Hotels under operating leases	53
Hotels under finance leases	6
Number of finance leases that were the liabilities of VIEs	2

Leases Minimum Lease Payments (

Leases Minimum Lease Payments (Details) $ in Millions	Dec. 31, 2018USD ($)
Operating leases [Member]
Operating Leases
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 206
Operating Leases, Future Minimum Payments, Due in Two Years	191
Operating Leases, Future Minimum Payments, Due in Three Years	166
Operating Leases, Future Minimum Payments, Due in Four Years	134
Operating Leases, Future Minimum Payments, Due in Five Years	119
Operating Leases, Future Minimum Payments, Due Thereafter	865
Total minimum lease payments	1,681
Capital Leases [Member]
Capital Leases
Capital Leases, Future Minimum Payments Due, Next Twelve Months	30
Capital Leases, Future Minimum Payments Due in Two Years	30
Capital Leases, Future Minimum Payments Due in Three Years	30
Capital Leases, Future Minimum Payments Due in Four Years	29
Capital Leases, Future Minimum Payments Due in Five Years	29
Capital Leases, Future Minimum Payments Due Thereafter	164
Total minimum lease payments	312
Less: amount representing interest	(87)
Present value of minimum lease payments	$ 225

Leases Lease Expenses (Details)

Leases Lease Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Leases [Abstract]
Fixed	$ 225	$ 183	$ 224
Contingent	142	101	98
Operating Leases, Rent Expense, Net	$ 367	$ 284	$ 322

Leases Supplemental Balance She

Leases Supplemental Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease right-of-use asset	$ 891	$ 0
Operating Lease, Liability, Current	131
Operating lease liabilities	1,066	$ 0
Finance Lease, Right-of-Use Asset	57
Finance Lease, Liability, Current	37
Finance Lease, Liability, Noncurrent	$ 223
Operating Lease, Weighted Average Remaining Lease Term	13 years
Finance Lease, Weighted Average Remaining Lease Term	8 years 10 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent	3.74%
Finance Lease, Weighted Average Discount Rate, Percent	5.80%

Leases Lease Costs (Details)

Leases Lease Costs (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Leases [Abstract]
Operating Lease, Cost	$ 36	$ 73
Finance Lease, Right-of-Use Asset, Amortization	8	16
Finance Lease, Interest Expense	3	7
Variable Lease, Cost	$ 52	$ 82

Leases Supplemental Cash Flow (

Leases Supplemental Cash Flow (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
Leases [Abstract]
Operating Lease, Payments	$ 90
Finance Lease, Principal Payments	21
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	21
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 52

Leases Future Minimum Lease Pay

Leases Future Minimum Lease Payments (Details) $ in Millions	Jun. 30, 2019USD ($)
Leases [Abstract]
Finance Lease, Liability, Payments, Remainder of Fiscal Year	$ 26
Finance Lease, Liability, Payments, Due Year Two	49
Finance Lease, Liability, Payments, Due Year Three	40
Finance Lease, Liability, Payments, Due Year Four	31
Finance Lease, Liability, Payments, Due Year Five	30
Finance Lease, Liability, Payments, Due after Year Five	166
Finance Lease, Liability, Payments, Due	342
Finance Lease, Liability, Undiscounted Excess Amount	(82)
Finance Lease, Liability	260
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	89
Lessee, Operating Lease, Liability, Payments, Due Year Two	175
Lessee, Operating Lease, Liability, Payments, Due Year Three	161
Lessee, Operating Lease, Liability, Payments, Due Year Four	137
Lessee, Operating Lease, Liability, Payments, Due Year Five	122
Lessee, Operating Lease, Liability, Payments, Due after Year Five	872
Lessee, Operating Lease, Liability, Payments, Due	1,556
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(359)
Operating Lease, Liability	$ 1,197

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Examination [Line Items]
Unrecognized Tax Benefits	$ 323		$ 323		$ 318	$ 283	$ 174	$ 315
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	44		44		40	33
Operating Loss Carryforwards					1,500
Income Tax Expense (Benefit)	(101)	$ (81)	(160)	$ (139)	(309)	336	(557)
Tax Cuts And Jobs Act 2017 Incomplete Accounting Provisional Income Tax Expense Benefit						600
Tax Cuts And Jobs Act Of 2017 Incomplete Accounting Transition Tax For Accumulated Foreign Earnings Provisional Income Tax Expense Benefit					2	15
Deferred Tax Assets, Operating Loss Carryforwards, Foreign					389
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration					$ 11
Operating Loss Carryforwards, Expiration Range					2019 and 2038
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration Within One Year					less than $1 million
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration					$ 378
Operating Loss Carryforwards, Valuation Allowance					379
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount					(9)
Release of valuation allowance against foreign deferred tax assets					6
Foreign deferred tax assets, valuation allowance, decrease					3
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	312		312		310	285
Income Tax Examination, Estimate of Possible Loss			817		817
Accrual for Taxing Authority Proposed Tax Owed Adjustment	$ 55		$ 55		52
Restructuring [Member]
Income Tax Examination [Line Items]
Deferred Other Tax Expense (Benefit)					(9)
Income Tax Expense (Benefit)							$ 477
Restructuring [Member] | U.S. DTLs [Member]
Income Tax Examination [Line Items]
Deferred Other Tax Expense (Benefit)					(12)
Restructuring [Member] | Remeasurement of DTAs/DTLs [Member]
Income Tax Examination [Line Items]
Deferred Other Tax Expense (Benefit)					3
Remeasurement of DTAs/DTLs, uncertain tax position reserves and other tax liabilities [Member]
Income Tax Examination [Line Items]
Tax Cuts And Jobs Act 2017 Incomplete Accounting Provisional Income Tax Expense Benefit						$ 569
Tax Cuts and Jobs Act of 2017, adjustment to complete accounting, income tax expense benefit					10
Post-enactment [Member]
Income Tax Examination [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent						21.00%
Remeasurement of U.S. DTAs/DTLs [Member]
Income Tax Examination [Line Items]
Tax Cuts And Jobs Act 2017 Incomplete Accounting Provisional Income Tax Expense Benefit						$ 452
Uncertain tax position reserves [Member]
Income Tax Examination [Line Items]
Tax Cuts And Jobs Act 2017 Incomplete Accounting Provisional Income Tax Expense Benefit						33
Other tax liabilities [Member]
Income Tax Examination [Line Items]
Tax Cuts And Jobs Act 2017 Incomplete Accounting Provisional Income Tax Expense Benefit						$ 84
Pre-enactment [Member]
Income Tax Examination [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent						35.00%
Recognition of tax benefits [Member]
Income Tax Examination [Line Items]
Tax Cuts And Jobs Act Of 2017 Incomplete Accounting Transition Tax For Accumulated Foreign Earnings Provisional Income Tax Expense Benefit						$ 16
Outside basis difference in controlled foreign corporation [Member]
Income Tax Examination [Line Items]
Tax Cuts and Jobs Act of 2017, adjustment to complete accounting, income tax expense benefit					$ 31

Income Taxes Income Tax Provisi

Income Taxes Income Tax Provision (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Domestic					$ 881	$ 632	$ 906
Income (Loss) from Continuing Operations before Income Taxes, Foreign					197	121	(366)
Income from continuing operations before income taxes	$ 362	$ 298	$ 580	$ 519	$ 1,078	$ 753	$ 540

Income Taxes Provision (Benefit

Income Taxes Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Current Federal Tax Expense (Benefit)					$ 210	$ 239	$ 441
Current State and Local Tax Expense (Benefit)					53	59	143
Current Foreign Tax Expense (Benefit)					60	95	70
Current Income Tax Expense (Benefit)					323	393	654
Deferred Federal Income Tax Expense (Benefit)					(52)	(667)	(123)
Deferred State and Local Income Tax Expense (Benefit)					(14)	(35)	45
Deferred Foreign Income Tax Expense (Benefit)					52	(27)	(19)
Deferred income taxes			$ 1	$ (39)	(14)	(729)	(97)
Income Tax Expense (Benefit)	$ (101)	$ (81)	$ (160)	$ (139)	$ (309)	$ 336	$ (557)

Income Taxes Reconciliation of

Income Taxes Reconciliation of Tax Provision (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount					$ 226	$ 264	$ 189
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount					37	19	22
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount					26	4	34
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount					13	(600)	0
Effective Income Tax Rate Reconciliation Additional Income Tax Expense From Structuring Transactions					9	0	477
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount					(6)	(48)	(20)
Income Tax Reconciliation Uncertain Tax Positions					16	38	(139)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount					(12)	(13)	(6)
Income Tax Expense (Benefit)	$ (101)	$ (81)	$ (160)	$ (139)	$ (309)	$ 336	$ (557)

Income Taxes Deferred Income Ta

Income Taxes Deferred Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards	$ 389	$ 395
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation	118	113
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other	18	39
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent	75	78
Deferred Tax Assets, Deferred Income	258	210
Deferred Tax Assets, Other	42	52
Deferred Tax Assets, Gross	900	887
Deferred Tax Assets, Valuation Allowance	399	408
Deferred Tax Assets, Net of Valuation Allowance	501	479
Deferred Tax Liabilities, Brand Intangible	1,123	1,122
Deferred Tax Liabilities, Intangible Assets	157	177
Deferred Tax Liabilities, Investment In Foreign Subsidiaries	29	0
Deferred Tax Liabilities, Gross	1,309	1,299
Deferred Tax Liabilities, Net	$ 808	$ 820

Income Taxes Tax Uncertainties

Income Taxes Tax Uncertainties (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2019	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits	$ 318	$ 283	$ 174	$ 323	$ 315
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	37	3	77
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	16	126	9
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	15	10	204
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	0	9	21
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	3	2	2
Unrecognized Tax Benefits, Increase Resulting from Foreign Currency Translation	$ 0	$ 1	$ 0

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Multiemployer Plans, Plan Assets	$ 297	$ 331
Multiemployer Plans, Accumulated Benefit Obligation	380	409
Defined Contribution Plan, Cost	$ 16	$ 15	$ 17
Domestic Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	80 percent	80 percent
Domestic Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	20 percent	20 percent
UK and foreign plan [Member] | Debt and equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	75 percent	75 percent
UK and foreign plan [Member] | Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment Policy and Strategy, Description	25 percent	25 percent
U.K. Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Amount Contributed	less than 1 million
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Amount Contributed	less than 1 million
Net Loss	less than 1 million
Total	less than 1 million

Employee Benefit Plans Changes

Employee Benefit Plans Changes in Projected Benefit Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation	$ 357	$ 384	$ 381
Defined Benefit Plan, Service Cost	0	0
Defined Benefit Plan, Interest Cost	12	12
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	0	0
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(14)	16
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	2	1
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	0	0
Defined Benefit Plan, Benefit Obligation, Benefits Paid	23	24
Defined Benefit Plan, Plan Assets, Amount	274	306	267
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(23)	43
Defined Benefit Plan, Plan Assets, Contributions by Employer	16	21
Defined Benefit Plan, Plan Assets, Payment for Settlement	2	1
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	0	0
Defined Benefit Plan, Plan Assets, Benefits Paid	23	24
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(83)	(78)
Defined Benefit Plan, Accumulated Benefit Obligation	357	384
U.K. Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation	375	443	404
Defined Benefit Plan, Service Cost	3	2
Defined Benefit Plan, Interest Cost	9	10
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	4	0
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(39)	4
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	0	0
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	(25)	40
Defined Benefit Plan, Benefit Obligation, Benefits Paid	20	17
Defined Benefit Plan, Plan Assets, Amount	340	386	336
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(14)	24
Defined Benefit Plan, Plan Assets, Contributions by Employer	10	9
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	0
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	(22)	34
Defined Benefit Plan, Plan Assets, Benefits Paid	20	17
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(35)	(57)
Defined Benefit Plan, Accumulated Benefit Obligation	375	443
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation	83	86	81
Defined Benefit Plan, Service Cost	2	1
Defined Benefit Plan, Interest Cost	2	1
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	0	0
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	0	3
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	1	0
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	(1)	4
Defined Benefit Plan, Benefit Obligation, Benefits Paid	5	4
Defined Benefit Plan, Plan Assets, Amount	63	65	$ 58
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	(1)	6
Defined Benefit Plan, Plan Assets, Contributions by Employer	4	4
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	0
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	0	1
Defined Benefit Plan, Plan Assets, Benefits Paid	5	4
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(20)	(21)
Defined Benefit Plan, Accumulated Benefit Obligation	$ 83	$ 86

Employee Benefit Plans Consolid

Employee Benefit Plans Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	$ (83)	$ (78)
U.K. Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	(35)	(57)
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	(20)	(21)
Other Noncurrent Assets [Member] | Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	0	0
Other Noncurrent Assets [Member] | U.K. Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	0	0
Other Noncurrent Assets [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	7	9
Other Liabilities [Member] | Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	(83)	(78)
Other Liabilities [Member] | U.K. Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	(35)	(57)
Other Liabilities [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	$ (27)	$ (30)

Employee Benefit Plans Accumula

Employee Benefit Plans Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	$ 22	$ (15)	$ 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax	4	3	3
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Amortization of Net Gain (Loss), before Tax	(3)	(3)	(3)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	15	(21)	(6)
U.K. Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	(14)	13	41
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax	(4)	0	0
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Amortization of Net Gain (Loss), before Tax	(4)	(4)	(2)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	(14)	9	39
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	3	0	3
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax	0	0	0
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Amortization of Net Gain (Loss), before Tax	(1)	0	(1)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	$ 2	$ 0	$ 2

Employee Benefit Plans Estimate

Employee Benefit Plans Estimated Unrecognized Prior Service Cost (Details) $ in Millions	Dec. 31, 2018USD ($)
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year	$ 3
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	3
Defined Benefit Plan, Expected Amortization, Next Fiscal Year	6
U.K. Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	4
Defined Benefit Plan, Expected Amortization, Next Fiscal Year	$ 4

Employee Benefit Plans Net Peri

Employee Benefit Plans Net Periodic Pension Cost (Credit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Service Cost and Administrative Expenses	$ 6	$ 8	$ 8
Defined Benefit Plan Interest Cost For Net Periodic Pension Cost	12	12	13
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	19	19	19
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	3	3	4
Defined Benefit Plan, Amortization of Gain (Loss)	3	3	3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	5	7	9
U.K. Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Service Cost and Administrative Expenses	3	2	2
Defined Benefit Plan Interest Cost For Net Periodic Pension Cost	9	10	12
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	21	19	22
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0
Defined Benefit Plan, Amortization of Gain (Loss)	4	4	2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(5)	(3)	(6)
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Service Cost and Administrative Expenses	2	2	3
Defined Benefit Plan Interest Cost For Net Periodic Pension Cost	2	2	2
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	3	3	3
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0
Defined Benefit Plan, Amortization of Gain (Loss)	1	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 2	$ 1	$ 2

Employee Benefit Plans Weighted

Employee Benefit Plans Weighted-Average Assumptions (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.60%	4.00%	4.20%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.30%	3.60%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	7.00%	7.00%	7.30%
U.K. Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	2.60%	2.80%	3.90%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.10%	2.60%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	1.80%	1.80%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Pension Increase	3.00%	3.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	5.50%	5.50%	6.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	1.80%	1.90%	1.70%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Pension Increase	3.00%	3.10%	2.80%
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	2.90%	3.00%	3.50%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.30%	2.40%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	2.20%	2.20%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Pension Increase	1.80%	1.80%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	4.60%	4.30%	5.40%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	2.20%	2.10%	2.10%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Pension Increase	1.80%	1.70%	1.60%

Employee Benefit Plans Fair Val

Employee Benefit Plans Fair Value Hierarchy (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 274	$ 306	$ 267
Domestic Plan [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Domestic Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Domestic Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Domestic Plan [Member] | Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Domestic Plan [Member] | Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
Domestic Plan [Member] | Bonds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Domestic Plan [Member] | Alternative investments [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Domestic Plan [Member] | Common Collective Trust [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	274	306
Domestic Plan [Member] | Other Investments [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
U.K. Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	340	386	336
U.K. Plan [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	34	0
U.K. Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	33
U.K. Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.K. Plan [Member] | Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	39
U.K. Plan [Member] | Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	0
U.K. Plan [Member] | Bonds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	44
U.K. Plan [Member] | Alternative investments [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	140
U.K. Plan [Member] | Common Collective Trust [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0	386
U.K. Plan [Member] | Other Investments [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	50
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	63	65	$ 58
Foreign Plan [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	11	11
Foreign Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	2
Foreign Plan [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	4	6
Foreign Plan [Member] | Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Foreign Plan [Member] | Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	6	5
Foreign Plan [Member] | Bonds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Foreign Plan [Member] | Alternative investments [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	0
Foreign Plan [Member] | Common Collective Trust [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	40	$ 43
Foreign Plan [Member] | Other Investments [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 0

Employee Benefit Plans Benefits

Employee Benefit Plans Benefits Expected to be Paid (Details) $ in Millions	Dec. 31, 2018USD ($)
Domestic Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	$ 35
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	27
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	27
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	26
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	26
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	121
Defined Benefit Plan Expected Future Benefit Payments	262
U.K. Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	19
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	19
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	20
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	20
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	20
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	107
Defined Benefit Plan Expected Future Benefit Payments	205
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	11
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	6
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	5
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	5
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	5
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	24
Defined Benefit Plan Expected Future Benefit Payments	$ 56

Share-Based Compensation (Detai

Share-Based Compensation (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 47	$ 40	$ 81	$ 68	$ 127	$ 121	$ 81
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense					42	49	31
Deferred Compensation Share-based Arrangements, Liability, Current					15	15
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 190		$ 190		$ 121
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			1 year 10 months 24 days		1 year 8 months 12 days
Common Stock, Capital Shares Reserved for Future Issuance	14.2		14.2		16.1
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost					$ 2.3	$ 3.3	$ 0.3
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate			0.81%		0.74%		1.43%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate			2.47%		2.73%		1.36%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value					$ 36
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term					8 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value					$ 25
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term					7 years
EBITDA CAGR [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage					50.00%
Free cash flow CAGR [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage					50.00%
Minimum [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate						0.92%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate						1.93%
Maximum [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate						1.03%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate						2.03%

Share-Based Compensation RSUs (

Share-Based Compensation RSUs (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, shares in Millions, $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	1	0.9	1.5	1.2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 83.38	$ 79.31	$ 58.80	$ 59.73
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested		$ 123	$ 78	$ 40
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	2 years	2 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years	3 years

Share-Based Compensation RSU Ac

Share-Based Compensation RSU Activity (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares shares in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		2	2.8
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value		$ 64.88	$ 51.44
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	1	0.9	1.5	1.2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 83.38	$ 79.31	$ 58.80	$ 59.73
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		1.5
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value		$ 49.56
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period		0.2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value		$ 56.09

Share-Based Compensation Option

Share-Based Compensation Options (Details) - Employee Stock Option [Member] - $ / shares shares in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0.8	0.6	0.7	0.5
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 83.11	$ 79.36	$ 58.40	$ 58.83
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 21.08	$ 23.72	$ 13.96	$ 16.41
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	1.6	1.1

Share-Based Compensation Weight

Share-Based Compensation Weighted Average Grant Date Fair Value Per Share (Details) - Employee Stock Option [Member]	6 Months Ended	12 Months Ended
	Jun. 30, 2019Rate	Dec. 31, 2018Rate	Dec. 31, 2017Rate	Dec. 31, 2016Rate
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	23.51%	27.91%	24.00%	32.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.81%	0.74%		1.43%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	2.47%	2.73%		1.36%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	6 years	6 years	6 years	6 years

Share-Based Compensation Stock

Share-Based Compensation Stock Option Activity (Details) - Employee Stock Option [Member] - $ / shares shares in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		2.4	2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price		$ 58.50	$ 51.24
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0.8	0.6	0.7	0.5
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 83.11	$ 79.36	$ 58.40	$ 58.83
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		0.2
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price		$ 50.15
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	1.6	1.1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price		$ 50.07

Share-Based Compensation Perfor

Share-Based Compensation Performance Shares (Details) - $ / shares shares in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0.4
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 83.11
EBITDA CAGR [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		0.2	0.2	0.3
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 79.36	$ 58.40	$ 58.83
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award	50 percent of the awards subject to achievement based on the compound annual growth rate ("CAGR") of the Company's earnings before interest expense, a provision for income taxes and depreciation and amortization ("EBITDA"), adjusted to exclude certain items ("Adjusted EBITDA")
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		50.00%
Free cash flow CAGR [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		0.2	0.2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 79.36	$ 58.40
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award	50 percent of the awards subject to achievement based on the Company's free cash flow ("FCF") per share CAGR
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		50.00%
2017 awards [Member] | EBITDA CAGR [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Shares achievement percentage		200.00%
2017 awards [Member] | Free cash flow CAGR [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Shares achievement percentage		200.00%
2018 awards [Member] | EBITDA CAGR [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Shares achievement percentage		150.00%
2018 awards [Member] | Free cash flow CAGR [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance Shares achievement percentage		150.00%
Minimum [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	0.00%
Maximum [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	200.00%
Target [Member] | Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	100.00%

Share-Based Compensation Perf_2

Share-Based Compensation Performance Share Grants (Details) - USD ($) $ / shares in Units, shares in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
EBITDA CAGR [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0.2	0.2	0.3
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 79.36	$ 58.40	$ 58.83
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	$ 0	$ 0	$ 12,000,000
Free cash flow CAGR [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0.2	0.2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 79.36	$ 58.40
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested	$ 0	$ 0
Relative shareholder return [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			0.3
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 62.43
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested			$ 16,000,000

Share-Based Compensation Perf_3

Share-Based Compensation Performance Share Activity (Details) - $ / shares shares in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
EBITDA CAGR [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	0.4	0.2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 69.53	$ 58.41
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0.2	0.2	0.3
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 79.36	$ 58.40	$ 58.83
Free cash flow CAGR [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	0.4	0.2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 69.53	$ 58.41
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0.2	0.2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 79.36	$ 58.40

Earnings per Share (Details)

Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended									6 Months Ended		12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net Income (Loss) Available to Common Stockholders, Basic	$ 260			$ 217						$ 418	$ 378
Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic												$ 764	$ 1,084	$ (27)
Weighted Average Number of Shares Outstanding, Basic	290			301						291	308	302	324	329
Income (Loss) from Continuing Operations, Per Basic Share												$ 2.53	$ 3.34	$ (0.08)
Net Income (Loss) from Continuing Operations Available to Common Shareholders, Diluted												$ 764	$ 1,084	$ (27)
Weighted Average Number of Shares Outstanding, Diluted	292			303						294	311	305	327	329
Net income (loss) from continuing operations per share												$ 2.50	$ 3.32	$ (0.08)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount												1	1	2
Earnings Per Share, Basic	$ 0.90	$ 0.76	$ 0.55	$ 0.72	$ 0.51	$ 2.29	$ 0.49	$ 0.46	$ 0.14	$ 1.43	$ 1.22	$ 2.53	$ 3.34	$ 1.03
Net Income (Loss) Available to Common Stockholders, Diluted	$ 260			$ 217						$ 418	$ 378
Earnings Per Share, Diluted	$ 0.89	$ 0.75	$ 0.54	$ 0.71	$ 0.51	$ 2.27	$ 0.49	$ 0.46	$ 0.14	$ 1.42	$ 1.21	$ 2.50	$ 3.32	$ 1.03

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (806)		$ (806)		$ (782)	$ (741)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0		0		(14)	(25)	$ (12)
Stockholders' Equity Note, Spinoff Transaction						(4,211)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Tax					0	0	0
Accumulated Other Comprehensive Income (Loss), Net of Tax	(533)	$ (558)	(533)	$ (558)	(545)	(513)	(738)	$ (580)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			11	(45)	(70)	161	(157)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(1)	0	0	(1)	1
Other comprehensive income (loss), net of tax, attributable to Hilton stockholders			12	(45)	(70)	162	(158)
Stockholders' Equity Note, Spinoff Transaction						63
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(256)	(226)	(256)	(226)	(260)	(229)	(251)	(194)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			0	0	(18)	15	(63)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(4)	(3)	(9)	(7)	(6)
Other comprehensive income (loss), net of tax, attributable to Hilton stockholders			4	3	(9)	22	(57)
Stockholders' Equity Note, Spinoff Transaction						0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(17)	42	(17)	42	23	1	(12)	(10)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(35)	36	17	(4)	(9)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			5	(5)	(5)	(17)	(7)
Other comprehensive income (loss), net of tax, attributable to Hilton stockholders			(40)	41	22	13	(2)
Stockholders' Equity Note, Spinoff Transaction						0
Accumulated other comprehensive loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(806)	(742)	(806)	(742)	(782)	(741)	(1,001)	$ (784)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(24)	(9)	(71)	172	(229)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0	(8)	(14)	(25)	(12)
Other comprehensive income (loss), net of tax, attributable to Hilton stockholders	$ (8)	$ (62)	$ (24)	$ (1)	(57)	197	$ (217)
Stockholders' Equity Note, Spinoff Transaction						$ 63
Accounting standards update 2018-02
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets					0
Accounting standards update 2018-02 | Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets					38
Accounting standards update 2018-02 | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets					(22)
Accounting standards update 2018-02 | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets					0
Accounting standards update 2018-02 | Accumulated other comprehensive loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets					$ 16

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Loss Additional Information About Reclassifications out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 1,400	$ 1,400
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0		$ (14)	$ (25)	$ (12)
Stock Repurchase Program, Authorized Amount	3,500	3,500
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	(1)	(1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(1)	$ 0	0	(1)	1
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(4)	(3)	(9)	(7)	(6)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	(1)	(2)		(3)	(3)	(4)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	(1)	(3)		8	7	5
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax				(2)	(3)	(3)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax	0	1
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax	(2)	(4)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		5	$ (5)	(5)	(17)	(7)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax				(6)	(26)	(12)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax				(1)	(9)	(5)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	3	6
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	0	(1)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	3	5
Net Investment Hedging [Member] | Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax				0	(1)	(1)
Currency translation adjustment release [Member] | Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax	$ (1)	$ (1)		$ 0	$ 2	$ 0

Accumulated Other Comprehensi_5

Accumulated Other Comprehensive Loss Components of Stockholders Equity (Details) - USD ($) $ in Millions	3 Months Ended									6 Months Ended		12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, shares					317,420,933					294,815,890	317,420,933	317,420,933
Beginning balance, equity attributable to Hilton stockholders					$ 1,688					$ 551	$ 1,688	$ 1,688
Beginning balance, equity attributable to noncontrolling interest					(3)					(7)	(3)	(3)
Beginning balance, equity	$ 108		$ 560	$ 1,747	1,691				$ 5,627	558	1,691	1,691	$ 5,627	$ 5,951
Net income attributable to Hilton stockholders	260	$ 224	162	217	161	$ 729	$ 158	$ 150	47	418	378	764	1,084	338
Net income attributable to noncontrolling interest	(1)			0						(2)	(2)	(5)	(5)	(16)
Net income	261	$ 225	$ 164	217	163	$ 730	$ 160	$ 151	$ 48	420	380	769	1,089	354
Other Comprehensive Income (Loss), Net of Tax	(8)			(62)						(24)	(1)	(57)	197	(218)
Dividends	44			46						87	94	184	196	279
Treasury Stock, Value, Acquired, Cost Method	383			1,329						679	1,439	$ 1,721	$ 891
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options	$ 45			33						$ 47	23
Deconsolidation of a variable interest entity														(4)
Ending balance, shares	287,693,211	294,815,890				317,420,933				287,693,211		294,815,890	317,420,933
Ending balance, equity attributable to Hilton stockholders	$ (30)	$ 551				$ 1,688				$ (30)		$ 551	$ 1,688
Ending balance, equity attributable to noncontrolling interest	(7)	(7)				(3)				(7)		(7)	(3)
Ending balance, equity	$ (23)	$ 558		$ 560	$ 1,747	$ 1,691				$ (23)	$ 560	$ 558	$ 1,691	$ 5,627
Common stock
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, shares	292,000,000		298,000,000	317,000,000	317,000,000				329,000,000	295,000,000	317,000,000	317,000,000	329,000,000	329,000,000
Beginning balance, equity attributable to Hilton stockholders	$ 3		$ 3	$ 3	$ 3				$ 3	$ 3	$ 3	$ 3	$ 3	$ 3
Treasury Stock, Shares, Acquired	4,000,000			19,000,000						8,000,000	20,000,000	23,000,000	14,000,000
Share-based compensation, shares										1,000,000	1,000,000	1,000,000	2,000,000
Ending balance, shares	288,000,000	295,000,000		298,000,000	317,000,000	317,000,000				288,000,000	298,000,000	295,000,000	317,000,000	329,000,000
Ending balance, equity attributable to Hilton stockholders	$ 3	$ 3		$ 3	$ 3	$ 3				$ 3	$ 3	$ 3	$ 3	$ 3
Treasury stock
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, equity attributable to Hilton stockholders	(2,921)		(2,330)	(1,001)	(891)				0	(2,625)	(891)	(891)	0	0
Treasury Stock, Value, Acquired, Cost Method	383			1,329						679	1,439	1,721	891
Ending balance, equity attributable to Hilton stockholders	(3,304)	(2,625)		(2,330)	(1,001)	(891)				(3,304)	(2,330)	(2,625)	(891)	0
Additional paid-in capital
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, equity attributable to Hilton stockholders	10,374		10,321	10,288	10,298				10,220	10,372	10,298	10,298	10,220	10,158
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options	45			33						47	23
Ending balance, equity attributable to Hilton stockholders	10,419	10,372		10,321	10,288	10,298				10,419	10,321	10,372	10,298	10,220
Retained earnings
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, equity attributable to Hilton stockholders	(6,558)		(6,697)	(6,868)	(6,981)				(3,545)	(6,417)	(6,981)	(6,981)	(3,545)	(3,392)
Net income attributable to Hilton stockholders	260			217						418	378	764	1,084	338
Dividends	44			46						87	94	184	196	279
Ending balance, equity attributable to Hilton stockholders	(6,342)	(6,417)		(6,697)	(6,868)	(6,981)				(6,342)	(6,697)	(6,417)	(6,981)	(3,545)
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, equity attributable to Hilton stockholders	(798)		(742)	(680)	(741)				(1,001)	(782)	(741)	(741)	(1,001)	(784)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(8)			(62)						(24)	(1)	(57)	197	(217)
Ending balance, equity attributable to Hilton stockholders	(806)	(782)		(742)	(680)	(741)				(806)	(742)	(782)	(741)	(1,001)
Noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, equity attributable to noncontrolling interest	8		$ 5	5	3				$ (50)	7	3	3	(50)	(34)
Net income attributable to noncontrolling interest	(1)									(2)	(2)	(5)	(5)	(16)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest												0	0	1
Deconsolidation of a variable interest entity														(4)
Ending balance, equity attributable to noncontrolling interest	7	$ 7		$ 5	$ 5	$ 3				7	$ 5	$ 7	$ 3	$ (50)
Variable Interest Entity, Primary Beneficiary [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Deconsolidation of a variable interest entity	(2)									(2)
Variable Interest Entity, Primary Beneficiary [Member] | Retained earnings
Accumulated Other Comprehensive Income (Loss) [Line Items]
Deconsolidation of a variable interest entity	(2)									(2)
Accounting Standards Update 2016-02 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	(256)									(256)					$ 256
Accounting Standards Update 2016-02 [Member] | Retained earnings
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ (256)									$ (256)

Business Segments (Details)

Business Segments (Details)	3 Months Ended	12 Months Ended
	Jun. 30, 2019RoomHotelSegment	Dec. 31, 2018RoomHotelSegment
Segment Reporting Information [Line Items]
Number of Operating Segments | Segment	2	2
Management and franchise
Segment Reporting Information [Line Items]
Number of Managed Hotels	691	689
Number of Franchised Hotels	5,059	4,874
Number of Managed and Franchised Rooms | Room	909,453	882,873
Ownership [Member]
Segment Reporting Information [Line Items]
Number of Owned and Leased Hotel Properties	67	71
Number of Owned and Leased Hotel Rooms | Room	20,928	21,720
Number of Wholly Owned and Leased Hotels and Resorts	59	62
Number of Non Wholly Owned Hotel Properties	1	1
Number of Hotels of Consolidated VIEs	2	2
Number of Hotels Owned or Leased by Unconsolidated Affiliates	5	6

Business Segments Revenues (Det

Business Segments Revenues (Details) - USD ($) $ in Millions	3 Months Ended									6 Months Ended		12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,484	$ 2,288	$ 2,253	$ 2,291	$ 2,074	$ 2,068	$ 2,091	$ 2,076	$ 1,896	$ 4,688	$ 4,365	$ 8,906	$ 8,131	$ 6,576
Amortization of Acquisition Costs	7			7						14	14	27	17	16
Franchise fees in segment revenues [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	445			405						830	738	1,537	1,326	1,095
Base and other management fees in segment revenues [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	106			101						198	191	385	379	284
Incentive management fees in segment revenues [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	58			59						113	114	235	222	142
Management and franchise
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	609			565						1,141	1,043	2,157	1,927	1,521
Ownership [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	387			392						699	726	1,484	1,432	1,434
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	996			957						1,840	1,769	3,641	3,359	2,955
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(11)			(11)						(19)	(19)	(44)	(43)	(42)
Hotel, Other
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	26			22						52	45	98	105	82
Reimbursement revenue, direct [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	789			730						1,564	1,429	2,881	2,572	1,644
Reimbursement revenue, indirect [Member]
Segment Reporting Information [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 691			$ 600						$ 1,265	$ 1,155	$ 2,357	$ 2,155	$ 1,953

Business Segments Operating Inc

Business Segments Operating Income (Details) - USD ($) $ in Millions	3 Months Ended									6 Months Ended		12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Operating income	$ 478	$ 362	$ 385	$ 406	$ 279	$ 259	$ 332	$ 324	$ 217	$ 790	$ 685	$ 1,432	$ 1,132	$ 868
Amortization of Acquisition Costs	7			7						14	14	27	17	16
Other revenues, less other expenses	11			10						17	19	47	49	16
Net reimbursement revenue and expense	22			3						(12)	(18)	(85)	(172)	(12)
Depreciation and amortization	86			79						170	161		336	353
Depreciation, Depletion and Amortization												325	336	353
General and Administrative Expense	113			115						220	219	443	439	409
Gain (Loss) on Disposition of Assets												0	0	8
Interest Expense	101			95						199	178	371	351	334
Foreign Currency Transaction Gain (Loss), before Tax	(3)			(12)						(3)	(1)	(11)	3	(16)
Gain (Loss) on Extinguishment of Debt												0	(60)	0
Other non-operating income, net	(12)			(1)						(8)	13	28	29	22
Income from continuing operations before income taxes	362			298						580	519	1,078	753	540
Management and franchise
Segment Reporting Information [Line Items]
Operating income	609			565						1,141	1,043	2,157	1,927	1,521
Ownership [Member]
Segment Reporting Information [Line Items]
Operating income	42			29						48	35	108	120	113
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income	$ 651			$ 594						$ 1,189	$ 1,078	$ 2,265	$ 2,047	$ 1,634

Business Segments Assets and Ca

Business Segments Assets and Capital Expenditures (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	$ 46	$ 28	$ 72	$ 58	$ 317
Assets	15,140		13,995	14,228
Capital expenditures for property and equipment of continuing operations			72	58	62
Management and franchise
Segment Reporting Information [Line Items]
Assets	11,399		11,362	11,505
Ownership [Member]
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	25	19	42	32	45
Assets	1,731		927	964
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	21	$ 9	30	26	$ 17
Assets	$ 2,010		$ 1,706	$ 1,759

Business Segments Geographical

Business Segments Geographical Locations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 8,906	$ 8,131	$ 6,576
Property, Plant and Equipment, Net	367	353		$ 418
UNITED STATES
Segment Reporting Information [Line Items]
Revenues	6,848	6,046	4,524
Property, Plant and Equipment, Net	109	105
JAPAN
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	106	94
UNITED KINGDOM
Segment Reporting Information [Line Items]
Revenues	545	544	942
Property, Plant and Equipment, Net	75	82
GERMANY
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Net	40	36
Total of All Other Countries [Member]
Segment Reporting Information [Line Items]
Revenues	1,513	1,541	$ 1,110
Property, Plant and Equipment, Net	$ 37	$ 36

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019USD ($)Contract	Dec. 31, 2018USD ($)Contract	Dec. 31, 2017USD ($)Contract
Loss Contingencies [Line Items]
Liabilities, Current	$ 2,780	$ 2,615	$ 2,462
Liabilities	15,163	13,437	12,537
Supply Commitment, Remaining Minimum Amount Committed	$ 392	$ 375	402
Performance Guarantee [Member]
Loss Contingencies [Line Items]
Number of Contracts With Performance Guarantees | Contract		5
Guarantor Obligations, Term		2019 to 2030
Guarantor Obligations, Maximum Exposure, Undiscounted		$ 36
Liabilities		$ 12	$ 21
Number of contracts with performance guarantees with recorded liabilities | Contract		1	2
Commitments to Extend Credit [Member]
Loss Contingencies [Line Items]
Other Commitment		$ 29
Other Commitment, Due in Next Twelve Months		19
Other Commitment, Due in Second Year		10
Guarantee of Indebtedness of Others [Member]
Loss Contingencies [Line Items]
Guarantor Obligations, Term	February 2022 with two one-year extension options
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 20
Number of Contracts with Guarantees | Contract	1
Performance Guarantee [Member]
Loss Contingencies [Line Items]
Liabilities, Current	$ 7	$ 12
Guarantor Obligations, Term	December 2019 to 2039
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 39
Number of contracts with performance guarantees with recorded liabilities | Contract	1	1
Number of Contracts with Guarantees | Contract	6
Commitments to Extend Credit [Member]
Loss Contingencies [Line Items]
Other Commitment	$ 29
Other Commitments, Future Minimum Payments, Remainder of Fiscal Year	19
Other Commitment, Due in Second Year	$ 10

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended									6 Months Ended		12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Management and franchise contracts, net	$ 817	$ 872				$ 953				$ 817		$ 872	$ 953
Revenue from Contract with Customer, Excluding Assessed Tax	2,484	2,288	$ 2,253	$ 2,291	$ 2,074	2,068	$ 2,091	$ 2,076	$ 1,896	4,688	$ 4,365	8,906	8,131	$ 6,576
Payments to Acquire Intangible Assets										43	38	103	75	55
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Management and franchise contracts, net		$ 19				$ 20						19	20
The Blackstone Group And Affiliates [Member]
Related Party Transaction [Line Items]
Payments to Acquire Intangible Assets													11
Management and franchise
Related Party Transaction [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	609			565						1,141	1,043	2,157	1,927	1,521
Management and franchise | Affiliated Entity [Member]
Related Party Transaction [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax												10	10	12
Management and franchise | The Blackstone Group And Affiliates [Member]
Related Party Transaction [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													24	42
Reimbursement Revenue
Related Party Transaction [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,480			1,330						2,829	2,584	5,238	4,727	3,597
Reimbursement Revenue | Affiliated Entity [Member]
Related Party Transaction [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax												22	22	21
Reimbursement Revenue | The Blackstone Group And Affiliates [Member]
Related Party Transaction [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax													113	144
Other expenses from managed and franchised properties
Related Party Transaction [Line Items]
Cost of Goods and Services Sold	$ 1,458			$ 1,327						$ 2,841	$ 2,602	5,323	4,899	3,609
Other expenses from managed and franchised properties | Affiliated Entity [Member]
Related Party Transaction [Line Items]
Cost of Goods and Services Sold												$ 22	22	21
Other expenses from managed and franchised properties | The Blackstone Group And Affiliates [Member]
Related Party Transaction [Line Items]
Cost of Goods and Services Sold													$ 113	$ 144

Supplemental Cash Flow Inform_2

Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Interest Paid, Including Capitalized Interest, Operating and Investing Activities			$ 330	$ 314	$ 478
Income Taxes Paid, Net	$ 157	$ 149	$ 288	526	677
Non-cash financing spin-offs				$ 25
Real Estate Owned, Transfer from Real Estate Owned					$ 116

Condensed Consolidated Guaran_3

Condensed Consolidated Guarantor Information (Details)	Jun. 30, 2019Rate	Dec. 31, 2018Rate
HOC [Member]
Noncontrolling Interest [Line Items]
Equity Method Investment, Ownership Percentage	100.00%	100.00%
HWF Issuers [Member]
Noncontrolling Interest [Line Items]
Equity Method Investment, Ownership Percentage	100.00%	100.00%
Hilton Worldwide Parent [Member]
Noncontrolling Interest [Line Items]
Equity Method Investment, Ownership Percentage	100.00%	100.00%
Domestic Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Equity Method Investment, Ownership Percentage		100.00%

Condensed Consolidated Guaran_4

Condensed Consolidated Guarantor Information Condensed Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Noncontrolling Interest [Line Items]
Cash and cash equivalents	$ 635		$ 403			$ 570
Restricted cash and cash equivalents	83		81			100
Restricted Cash and Cash Equivalents			81			100
Accounts Receivable, Net, Current	1,190		1,150			1,005
Intercompany Receivables	0		0			0
Prepaid expenses	117		160			127
Income taxes receivable			20			36
Other Assets, Current	190		169			169
Assets, Current	2,215		1,983			2,007
Investments In Consolidated Subsidiaries	0		0			0
Goodwill	5,157		5,160			5,190	$ 5,218
Indefinite-lived Intangible Assets (Excluding Goodwill)	4,874		4,869			4,890
Management and franchise contracts, net	817		872			953
Other intangible assets, net	400		415			433
Operating Lease, Right-of-Use Asset	891		0
Property, Plant and Equipment, Net	418		367			353
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	146		90			111
Other	222		239			291
Assets, Noncurrent	12,925		12,012			12,221
Assets	15,140		13,995			14,228
Accounts payable, accrued expenses and other	1,657		1,530			1,416
Current portion of deferred revenues	298		350			366
Intercompany Payables	0		0			0
Long-term Debt and Capital Lease Obligations, Current	37		16			46
Accrued Income Taxes, Current			19			12
Customer Loyalty Program Liability, Current			700			622
Liabilities, Current	2,780		2,615			2,462
Long-term Debt and Capital Lease Obligations	7,772		7,266			6,556
Operating lease liabilities	1,066		0
Deferred Revenue, Noncurrent	822		826			829
Deferred income tax liabilities	861		898			931
Contract with Customer, Liability, Noncurrent			969			839
Customer Loyalty Program Liability, Noncurrent			969			839
Other Liabilities, Noncurrent	876		863			920
Liabilities	15,163		13,437			12,537
Stockholders' Equity Attributable to Parent	(30)		551			1,688
Stockholders' Equity Attributable to Noncontrolling Interest	7		7			3
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(23)	$ 108	558	$ 560	$ 1,747	1,691	$ 5,627	$ 5,951
Liabilities and Equity	15,140		13,995			14,228
Parent Company [Member]
Noncontrolling Interest [Line Items]
Cash and cash equivalents	0		0			0
Restricted cash and cash equivalents	0		0
Restricted Cash and Cash Equivalents			0			0
Accounts Receivable, Net, Current	0		0			0
Intercompany Receivables	0		0			0
Prepaid expenses	0		0			0
Income taxes receivable			0			0
Other Assets, Current	0		0			0
Assets, Current	0		0			0
Investments In Consolidated Subsidiaries	2		557			1,697
Goodwill	0		0			0
Indefinite-lived Intangible Assets (Excluding Goodwill)	0		0			0
Management and franchise contracts, net	0		0			0
Other intangible assets, net	0		0			0
Operating Lease, Right-of-Use Asset	0
Property, Plant and Equipment, Net	0		0			0
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	4		4			6
Other	0		0			0
Assets, Noncurrent	6		561			1,703
Assets	6		561			1,703
Accounts payable, accrued expenses and other	36		10			15
Current portion of deferred revenues	0		0			0
Intercompany Payables	0		0			0
Long-term Debt and Capital Lease Obligations, Current	0		0			0
Accrued Income Taxes, Current			0			0
Customer Loyalty Program Liability, Current			0			0
Liabilities, Current	36		10			15
Long-term Debt and Capital Lease Obligations	0		0			0
Operating lease liabilities	0
Deferred Revenue, Noncurrent	0		0			0
Deferred income tax liabilities	0		0			0
Customer Loyalty Program Liability, Noncurrent			0			0
Other Liabilities, Noncurrent	0		0			0
Liabilities	36		10			15
Stockholders' Equity Attributable to Parent	(30)		551			1,688
Stockholders' Equity Attributable to Noncontrolling Interest	0		0			0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(30)		551			1,688
Liabilities and Equity	6		561			1,703
HWF Issuers [Member]
Noncontrolling Interest [Line Items]
Cash and cash equivalents	0		0			0
Restricted cash and cash equivalents	0		0
Restricted Cash and Cash Equivalents			0			0
Accounts Receivable, Net, Current	0		0			0
Intercompany Receivables	0		0			0
Prepaid expenses	0		0			0
Income taxes receivable			0			0
Other Assets, Current	1		1			0
Assets, Current	1		1			0
Investments In Consolidated Subsidiaries	4,113		5,131			7,067
Goodwill	0		0			0
Indefinite-lived Intangible Assets (Excluding Goodwill)	0		0			0
Management and franchise contracts, net	0		0			0
Other intangible assets, net	0		0			0
Operating Lease, Right-of-Use Asset	0
Property, Plant and Equipment, Net	0		0			0
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	7		0			0
Other	12		23			20
Assets, Noncurrent	4,132		5,154			7,087
Assets	4,133		5,155			7,087
Accounts payable, accrued expenses and other	20		19			20
Current portion of deferred revenues	0		0			0
Intercompany Payables	0		0			0
Long-term Debt and Capital Lease Obligations, Current	0		0			32
Accrued Income Taxes, Current			0			0
Customer Loyalty Program Liability, Current			0			0
Liabilities, Current	20		19			52
Long-term Debt and Capital Lease Obligations	4,076		4,573			5,333
Operating lease liabilities	0
Deferred Revenue, Noncurrent	0		0			0
Deferred income tax liabilities	0		6			5
Customer Loyalty Program Liability, Noncurrent			0			0
Other Liabilities, Noncurrent	35		0			0
Liabilities	4,131		4,598			5,390
Stockholders' Equity Attributable to Parent	2		557			1,697
Stockholders' Equity Attributable to Noncontrolling Interest	0		0			0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2		557			1,697
Liabilities and Equity	4,133		5,155			7,087
HOC [Member]
Noncontrolling Interest [Line Items]
Cash and cash equivalents	3		3			2
Restricted cash and cash equivalents	34		34
Restricted Cash and Cash Equivalents			34			61
Accounts Receivable, Net, Current	14		10			18
Intercompany Receivables	0		0			0
Prepaid expenses	16		52			25
Income taxes receivable			0			0
Other Assets, Current	1		1			1
Assets, Current	68		100			107
Investments In Consolidated Subsidiaries	7,850		7,930			8,326
Goodwill	0		0			0
Indefinite-lived Intangible Assets (Excluding Goodwill)	0		0			0
Management and franchise contracts, net	1		0			2
Other intangible assets, net	0		0			1
Operating Lease, Right-of-Use Asset	36
Property, Plant and Equipment, Net	61		27			20
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	86		94			104
Other	31		33			32
Assets, Noncurrent	8,065		8,084			8,485
Assets	8,133		8,184			8,592
Accounts payable, accrued expenses and other	201		229			184
Current portion of deferred revenues	47		106			90
Intercompany Payables	40		40			40
Long-term Debt and Capital Lease Obligations, Current	20		0			0
Accrued Income Taxes, Current			0			0
Customer Loyalty Program Liability, Current			0			0
Liabilities, Current	308		375			314
Long-term Debt and Capital Lease Obligations	3,473		2,467			983
Operating lease liabilities	43
Deferred Revenue, Noncurrent	0		0			0
Deferred income tax liabilities	0		0			0
Customer Loyalty Program Liability, Noncurrent			0			0
Other Liabilities, Noncurrent	196		211			228
Liabilities	4,020		3,053			1,525
Stockholders' Equity Attributable to Parent	4,113		5,131			7,067
Stockholders' Equity Attributable to Noncontrolling Interest	0		0			0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	4,113		5,131			7,067
Liabilities and Equity	8,133		8,184			8,592
Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Cash and cash equivalents	23		17			18
Restricted cash and cash equivalents	16		15
Restricted Cash and Cash Equivalents			15			10
Accounts Receivable, Net, Current	852		735			712
Intercompany Receivables	0		0			0
Prepaid expenses	48		37			24
Income taxes receivable			23			60
Other Assets, Current	48		13			13
Assets, Current	987		840			837
Investments In Consolidated Subsidiaries	2		557			1,697
Goodwill	3,824		3,824			3,824
Indefinite-lived Intangible Assets (Excluding Goodwill)	4,405		4,404			4,405
Management and franchise contracts, net	502		556			645
Other intangible assets, net	279		287			283
Operating Lease, Right-of-Use Asset	10
Property, Plant and Equipment, Net	67		65			67
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	0		0			0
Other	17		22			67
Assets, Noncurrent	9,106		9,715			10,988
Assets	10,093		10,555			11,825
Accounts payable, accrued expenses and other	664		529			576
Current portion of deferred revenues	241		239			266
Intercompany Payables	0		0			0
Long-term Debt and Capital Lease Obligations, Current	0		0			0
Accrued Income Taxes, Current			0			0
Customer Loyalty Program Liability, Current			700			622
Liabilities, Current	1,693		1,468			1,464
Long-term Debt and Capital Lease Obligations	0		0			0
Operating lease liabilities	8
Deferred Revenue, Noncurrent	754		762			770
Deferred income tax liabilities	958		962			1,052
Customer Loyalty Program Liability, Noncurrent			969			839
Other Liabilities, Noncurrent	94		93			64
Liabilities	4,493		4,254			4,189
Stockholders' Equity Attributable to Parent	5,600		6,301			7,636
Stockholders' Equity Attributable to Noncontrolling Interest	0		0			0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	5,600		6,301			7,636
Liabilities and Equity	10,093		10,555			11,825
Non-Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Cash and cash equivalents	609		383			550
Restricted cash and cash equivalents	33		32
Restricted Cash and Cash Equivalents			32			29
Accounts Receivable, Net, Current	324		405			275
Intercompany Receivables	40		40			40
Prepaid expenses	55		80			84
Income taxes receivable			0			0
Other Assets, Current	147		154			155
Assets, Current	1,208		1,094			1,133
Investments In Consolidated Subsidiaries	0		0			0
Goodwill	1,333		1,336			1,366
Indefinite-lived Intangible Assets (Excluding Goodwill)	469		465			485
Management and franchise contracts, net	314		316			306
Other intangible assets, net	121		128			149
Operating Lease, Right-of-Use Asset	845
Property, Plant and Equipment, Net	290		275			266
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	146		90			127
Other	162		161			172
Assets, Noncurrent	3,680		2,771			2,871
Assets	4,888		3,865			4,004
Accounts payable, accrued expenses and other	743		743			624
Current portion of deferred revenues	12		14			13
Intercompany Payables	0		0			0
Long-term Debt and Capital Lease Obligations, Current	17		16			14
Accrued Income Taxes, Current			22			36
Customer Loyalty Program Liability, Current			0			0
Liabilities, Current	772		795			687
Long-term Debt and Capital Lease Obligations	223		226			240
Operating lease liabilities	1,015
Deferred Revenue, Noncurrent	68		64			59
Deferred income tax liabilities	0		28			0
Customer Loyalty Program Liability, Noncurrent			0			0
Other Liabilities, Noncurrent	551		559			628
Liabilities	2,629		1,672			1,614
Stockholders' Equity Attributable to Parent	2,252		2,186			2,387
Stockholders' Equity Attributable to Noncontrolling Interest	7		7			3
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	2,259		2,193			2,390
Liabilities and Equity	4,888		3,865			4,004
Consolidation, Eliminations [Member]
Noncontrolling Interest [Line Items]
Cash and cash equivalents	0		0			0
Restricted cash and cash equivalents	0		0
Restricted Cash and Cash Equivalents			0			0
Accounts Receivable, Net, Current	0		0			0
Intercompany Receivables	(40)		(40)			(40)
Prepaid expenses	(2)		(9)			(6)
Income taxes receivable			(3)			(24)
Other Assets, Current	(7)		0			0
Assets, Current	(49)		(52)			(70)
Investments In Consolidated Subsidiaries	(11,967)		(14,175)			(18,787)
Goodwill	0		0			0
Indefinite-lived Intangible Assets (Excluding Goodwill)	0		0			0
Management and franchise contracts, net	0		0			0
Other intangible assets, net	0		0			0
Operating Lease, Right-of-Use Asset	0
Property, Plant and Equipment, Net	0		0			0
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	(97)		(98)			(126)
Other	0		0			0
Assets, Noncurrent	(12,064)		(14,273)			(18,913)
Assets	(12,113)		(14,325)			(18,983)
Accounts payable, accrued expenses and other	(7)		0			(3)
Current portion of deferred revenues	(2)		(9)			(3)
Intercompany Payables	(40)		(40)			(40)
Long-term Debt and Capital Lease Obligations, Current	0		0			0
Accrued Income Taxes, Current			(3)			(24)
Customer Loyalty Program Liability, Current			0			0
Liabilities, Current	(49)		(52)			(70)
Long-term Debt and Capital Lease Obligations	0		0			0
Operating lease liabilities	0
Deferred Revenue, Noncurrent	0		0			0
Deferred income tax liabilities	(97)		(98)			(126)
Customer Loyalty Program Liability, Noncurrent			0			0
Other Liabilities, Noncurrent	0		0			0
Liabilities	(146)		(150)			(196)
Stockholders' Equity Attributable to Parent	(11,967)		(14,175)			(18,787)
Stockholders' Equity Attributable to Noncontrolling Interest	0		0			0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(11,967)		(14,175)			(18,787)
Liabilities and Equity	(12,113)		(14,325)			$ (18,983)
Guest Loyalty Program [Member]
Noncontrolling Interest [Line Items]
Current portion of liability for guest loyalty program	788		700
Contract with Customer, Liability, Noncurrent	986		969
Guest Loyalty Program [Member] | Parent Company [Member]
Noncontrolling Interest [Line Items]
Current portion of liability for guest loyalty program	0		0
Contract with Customer, Liability, Noncurrent	0		0
Guest Loyalty Program [Member] | HWF Issuers [Member]
Noncontrolling Interest [Line Items]
Current portion of liability for guest loyalty program	0		0
Contract with Customer, Liability, Noncurrent	0		0
Guest Loyalty Program [Member] | HOC [Member]
Noncontrolling Interest [Line Items]
Current portion of liability for guest loyalty program	0		0
Contract with Customer, Liability, Noncurrent	0		0
Guest Loyalty Program [Member] | Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Current portion of liability for guest loyalty program	788		700
Contract with Customer, Liability, Noncurrent	986		969
Guest Loyalty Program [Member] | Non-Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Current portion of liability for guest loyalty program	0		0
Contract with Customer, Liability, Noncurrent	0		0
Guest Loyalty Program [Member] | Consolidation, Eliminations [Member]
Noncontrolling Interest [Line Items]
Current portion of liability for guest loyalty program	0		0
Contract with Customer, Liability, Noncurrent	$ 0		0
Restatement
Noncontrolling Interest [Line Items]
Other Assets, Current			189
Accounts payable, accrued expenses and other			1,549
Restatement | Parent Company [Member]
Noncontrolling Interest [Line Items]
Other Assets, Current			0
Accounts payable, accrued expenses and other			10
Restatement | HWF Issuers [Member]
Noncontrolling Interest [Line Items]
Other Assets, Current			1
Accounts payable, accrued expenses and other			19
Restatement | HOC [Member]
Noncontrolling Interest [Line Items]
Other Assets, Current			1
Accounts payable, accrued expenses and other			229
Restatement | Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Other Assets, Current			36
Accounts payable, accrued expenses and other			529
Restatement | Non-Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Other Assets, Current			154
Accounts payable, accrued expenses and other			765
Restatement | Consolidation, Eliminations [Member]
Noncontrolling Interest [Line Items]
Other Assets, Current			(3)
Accounts payable, accrued expenses and other			$ (3)

Condensed Consolidated Guaran_5

Condensed Consolidated Guarantor Information Condensed Statement of Income and Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended									6 Months Ended		12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,484	$ 2,288	$ 2,253	$ 2,291	$ 2,074	$ 2,068	$ 2,091	$ 2,076	$ 1,896	$ 4,688	$ 4,365	$ 8,906	$ 8,131	$ 6,576
Depreciation and amortization	86			79						170	161		336	353
Depreciation, Depletion and Amortization												325	336	353
General and Administrative Expense	113			115						220	219	443	439	409
Other Expenses	15			12						35	26	51	56	66
Costs And Expenses Excluding Cost Of Reimbursable Expense	548			558						1,057	1,078	2,151	2,100	2,107
Total expenses	2,006			1,885						3,898	3,680	7,474	6,999	5,716
Gain (Loss) on Disposition of Assets												0	0	8
Operating income	478	362	385	406	279	259	332	324	217	790	685	1,432	1,132	868
Interest Expense	101			95						199	178	371	351	334
Foreign Currency Transaction Gain (Loss), before Tax	(3)			(12)						(3)	(1)	(11)	3	(16)
Gain (Loss) on Extinguishment of Debt												0	(60)	0
Other non-operating income, net	(12)			(1)						(8)	13	28	29	22
Income from continuing operations before income taxes	362			298						580	519	1,078	753	540
Income Tax Expense (Benefit)	(101)			(81)						(160)	(139)	(309)	336	(557)
Income (Loss) After Taxes Before Income from Subsidiaries Net of Taxes	261			217						420	380	769	1,089	(17)
Income (Loss) from Subsidiaries, Net of Tax	0			0						0	0	0	0	0
Net income	261	225	164	217	163	730	160	151	48	420	380	769	1,089	354
Net income attributable to noncontrolling interest	(1)			0						(2)	(2)	(5)	(5)	(16)
Net income attributable to Hilton stockholders	260	$ 224	$ 162	217	$ 161	$ 729	$ 158	$ 150	$ 47	418	378	764	1,084	338
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	253			155						396	379	712	1,286	136
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	1			0						2	2	(5)	(5)	(15)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	252			155						394	377	707	1,281	121
Income (loss) from continuing operations, net of taxes												769	1,089	(17)
Income from discontinued operations, net of taxes												0	0	371
Parent Company [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Depreciation and amortization	0			0						0	0
Depreciation, Depletion and Amortization												0	0	0
General and Administrative Expense	0			0						0	0	0	0	0
Other Expenses	0			0						0	0	0	0	0
Costs And Expenses Excluding Cost Of Reimbursable Expense	0			0						0	0	0	0	0
Total expenses	0			0						0	0	0	0	0
Gain (Loss) on Disposition of Assets													0	0
Operating income	0			0						0	0	0	0	0
Interest Expense	0			0						0	0	0	0	0
Foreign Currency Transaction Gain (Loss), before Tax	0			0						0	0	0	0	0
Gain (Loss) on Extinguishment of Debt													0
Other non-operating income, net	0			0						0	0	0	0	0
Income from continuing operations before income taxes	0			0						0	0	0	0	0
Income Tax Expense (Benefit)	0			0						0	0	0	(3)	193
Income (Loss) After Taxes Before Income from Subsidiaries Net of Taxes	0			0						0	0	0	(3)	193
Income (Loss) from Subsidiaries, Net of Tax	260			217						418	378	764	1,087	(220)
Net income	260			217						418	378	764	1,084	338
Net income attributable to noncontrolling interest	0			0						0	0	0	0	0
Net income attributable to Hilton stockholders	260			217						418	378	764	1,084	338
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	252			155						394	377	707	1,281	121
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	0			0						0	0	0	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	252			155						394	377	707	1,281	121
Income (loss) from continuing operations, net of taxes														(27)
Income from discontinued operations, net of taxes														365
HWF Issuers [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Depreciation and amortization	0			0						0	0
Depreciation, Depletion and Amortization												0	0	0
General and Administrative Expense	0			0						0	0	0	0	0
Other Expenses	0			0						0	0	0	0	0
Costs And Expenses Excluding Cost Of Reimbursable Expense	0			0						0	0	0	0	0
Total expenses	0			0						0	0	0	0	0
Gain (Loss) on Disposition of Assets													0	0
Operating income	0			0						0	0	0	0	0
Interest Expense	52			57						103	118	227	244	261
Foreign Currency Transaction Gain (Loss), before Tax	0			0						0	0	0	0	0
Gain (Loss) on Extinguishment of Debt													(60)
Other non-operating income, net	(9)			(7)						(9)	(7)	(9)	(3)	1
Income from continuing operations before income taxes	(61)			(64)						(112)	(125)	(236)	(307)	(260)
Income Tax Expense (Benefit)	15			16						27	31	57	122	100
Income (Loss) After Taxes Before Income from Subsidiaries Net of Taxes	(46)			(48)						(85)	(94)	(179)	(185)	(160)
Income (Loss) from Subsidiaries, Net of Tax	306			265						503	472	943	1,272	(60)
Net income	260			217						418	378	764	1,087	145
Net income attributable to noncontrolling interest	0			0						0	0	0	0	0
Net income attributable to Hilton stockholders	260			217						418	378	764	1,087	145
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	235			227						378	417	784	1,101	143
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	0			0						0	0	0	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	235			227						378	417	784	1,101	143
Income (loss) from continuing operations, net of taxes														(220)
Income from discontinued operations, net of taxes														365
HOC [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	151			114						287	204	479	334	63
Depreciation and amortization	1			2						3	3
Depreciation, Depletion and Amortization												6	5	1
General and Administrative Expense	89			83						171	156	323	327	90
Other Expenses	3			2						4	4	7	17	1
Costs And Expenses Excluding Cost Of Reimbursable Expense	93			87						178	163	336	349	92
Total expenses	180			149						337	271	572	496	124
Gain (Loss) on Disposition of Assets													0	0
Operating income	(29)			(35)						(50)	(67)	(93)	(162)	(61)
Interest Expense	33			31						68	44	106	61	14
Foreign Currency Transaction Gain (Loss), before Tax	(1)			6						1	3	4	10	11
Gain (Loss) on Extinguishment of Debt													0
Other non-operating income, net	0			1						0	4	3	4	1
Income from continuing operations before income taxes	(63)			(59)						(117)	(104)	(192)	(209)	(63)
Income Tax Expense (Benefit)	14			14						27	27	39	26	26
Income (Loss) After Taxes Before Income from Subsidiaries Net of Taxes	(49)			(45)						(90)	(77)	(153)	(183)	(37)
Income (Loss) from Subsidiaries, Net of Tax	355			310						593	549	1,096	1,455	(23)
Net income	306			265						503	472	943	1,272	305
Net income attributable to noncontrolling interest	0			0						0	0	0	0	0
Net income attributable to Hilton stockholders	306			265						503	472	943	1,272	305
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	308			266						506	473	932	1,288	310
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	0			0						0	0	0	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	308			266						506	473	932	1,288	310
Income (loss) from continuing operations, net of taxes														(60)
Income from discontinued operations, net of taxes														365
Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,683			1,526						3,214	2,954	5,922	5,404	4,226
Depreciation and amortization	63			58						125	118
Depreciation, Depletion and Amortization												237	242	266
General and Administrative Expense	0			0						0	0	0	0	203
Other Expenses	2			8						10	15	22	29	31
Costs And Expenses Excluding Cost Of Reimbursable Expense	65			66						135	133	259	271	500
Total expenses	1,289			1,180						2,537	2,331	4,725	4,418	3,583
Gain (Loss) on Disposition of Assets													(1)	0
Operating income	394			346						677	623	1,197	985	643
Interest Expense	0			0						0	0	0	0	12
Foreign Currency Transaction Gain (Loss), before Tax	(9)			(89)						(27)	(81)	84	124	(150)
Gain (Loss) on Extinguishment of Debt													0
Other non-operating income, net	(5)			4						(5)	12	16	7	7
Income from continuing operations before income taxes	380			261						645	554	1,297	1,116	488
Income Tax Expense (Benefit)	(94)			(61)						(159)	(134)	(309)	89	(297)
Income (Loss) After Taxes Before Income from Subsidiaries Net of Taxes	286			200						486	420	988	1,205	191
Income (Loss) from Subsidiaries, Net of Tax	260			217						418	378	764	1,087	(220)
Net income	546			417						904	798	1,752	2,292	397
Net income attributable to noncontrolling interest	0			0						0	0	0	0	0
Net income attributable to Hilton stockholders	546			417						904	798	1,752	2,292	397
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	546			416						904	798	1,751	2,295	326
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	0			0						0	0	0	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	546			416						904	798	1,751	2,295	326
Income (loss) from continuing operations, net of taxes														(29)
Income from discontinued operations, net of taxes														426
Non-Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	654			654						1,196	1,219	2,523	2,417	2,297
Depreciation and amortization	22			19						42	40
Depreciation, Depletion and Amortization												82	89	86
General and Administrative Expense	31			32						62	67	130	118	116
Other Expenses	7			6						17	15	30	27	44
Costs And Expenses Excluding Cost Of Reimbursable Expense	394			409						753	794	1,574	1,503	1,525
Total expenses	541			560						1,033	1,090	2,195	2,108	2,019
Gain (Loss) on Disposition of Assets													1	8
Operating income	113			94						163	129	328	310	286
Interest Expense	16			9						28	19	38	47	47
Foreign Currency Transaction Gain (Loss), before Tax	7			71						23	77	(99)	(131)	123
Gain (Loss) on Extinguishment of Debt													0
Other non-operating income, net	2			4						6	7	18	21	13
Income from continuing operations before income taxes	106			160						164	194	209	153	375
Income Tax Expense (Benefit)	(36)			(50)						(55)	(63)	(96)	102	(579)
Income (Loss) After Taxes Before Income from Subsidiaries Net of Taxes	70			110						109	131	113	255	(204)
Income (Loss) from Subsidiaries, Net of Tax	0			0						0	0	0	0	0
Net income	70			110						109	131	113	255	171
Net income attributable to noncontrolling interest	(1)			0						(2)	(2)	(5)	(5)	(16)
Net income attributable to Hilton stockholders	69			110						107	129	108	250	155
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	85			38						122	90	48	419	21
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	1			0						2	2	(5)	(5)	(15)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	84			38						120	88	43	414	6
Income (loss) from continuing operations, net of taxes														(204)
Income from discontinued operations, net of taxes														375
Franchise [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	444			404						826	735	1,530	1,321	1,091
Franchise [Member] | Parent Company [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Franchise [Member] | HWF Issuers [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Franchise [Member] | HOC [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	69			50						130	94	227	143	21
Franchise [Member] | Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	338			322						632	584	1,182	1,077	974
Franchise [Member] | Non-Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	41			36						73	65	139	118	106
Base and other management fees
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	89			84						169	161	321	324	230
Base and other management fees | Parent Company [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Base and other management fees | HWF Issuers [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Base and other management fees | HOC [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			1						0	1	1	1	0
Base and other management fees | Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	57			55						109	106	205	195	122
Base and other management fees | Non-Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	32			28						60	54	115	128	108
Incentive management fees
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	58			59						113	114	235	222	142
Incentive management fees | Parent Company [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Incentive management fees | HWF Issuers [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Incentive management fees | HOC [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Incentive management fees | Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	21			22						44	43	78	76	16
Incentive management fees | Non-Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	37			37						69	71	157	146	126
Hotel, Owned
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	387			392						699	726	1,484	1,432	1,434
Cost of Goods and Services Sold	334			352						632	672	1,332	1,269	1,279
Hotel, Owned | Parent Company [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Cost of Goods and Services Sold	0			0						0	0	0	0	0
Hotel, Owned | HWF Issuers [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Cost of Goods and Services Sold	0			0						0	0	0	0	0
Hotel, Owned | HOC [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Cost of Goods and Services Sold	0			0						0	0	0	0	0
Hotel, Owned | Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Cost of Goods and Services Sold	0			0						0	0	0	0	0
Hotel, Owned | Non-Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	387			392						699	726	1,484	1,432	1,434
Cost of Goods and Services Sold	334			352						632	672	1,332	1,269	1,279
Hotel, Other
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	26			22						52	45	98	105	82
Hotel, Other | Parent Company [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Hotel, Other | HWF Issuers [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Hotel, Other | HOC [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1			1						1	3	6	31	10
Hotel, Other | Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	20			17						43	41	81	70	61
Hotel, Other | Non-Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	5			3						8	5	11	11	11
Total revenues excluding reimbursable revenues
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,004			961						1,859	1,781	3,668	3,404	2,979
Total revenues excluding reimbursable revenues | Parent Company [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Total revenues excluding reimbursable revenues | HWF Issuers [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Total revenues excluding reimbursable revenues | HOC [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	70			52						131	98	234	175	31
Total revenues excluding reimbursable revenues | Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	436			416						828	774	1,546	1,418	1,173
Total revenues excluding reimbursable revenues | Non-Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	502			496						909	921	1,906	1,835	1,785
Reimbursement Revenue
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,480			1,330						2,829	2,584	5,238	4,727	3,597
Reimbursement Revenue | Parent Company [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Reimbursement Revenue | HWF Issuers [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Reimbursement Revenue | HOC [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	81			62						156	106	245	159	32
Reimbursement Revenue | Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,247			1,110						2,386	2,180	4,376	3,986	3,053
Reimbursement Revenue | Non-Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	152			158						287	298	617	582	512
Other expenses from managed and franchised properties
Noncontrolling Interest [Line Items]
Cost of Goods and Services Sold	1,458			1,327						2,841	2,602	5,323	4,899	3,609
Other expenses from managed and franchised properties | Parent Company [Member]
Noncontrolling Interest [Line Items]
Cost of Goods and Services Sold	0			0						0	0	0	0	0
Other expenses from managed and franchised properties | HWF Issuers [Member]
Noncontrolling Interest [Line Items]
Cost of Goods and Services Sold	0			0						0	0	0	0	0
Other expenses from managed and franchised properties | HOC [Member]
Noncontrolling Interest [Line Items]
Cost of Goods and Services Sold	87			62						159	108	236	147	32
Other expenses from managed and franchised properties | Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Cost of Goods and Services Sold	1,224			1,114						2,402	2,198	4,466	4,147	3,083
Other expenses from managed and franchised properties | Non-Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Cost of Goods and Services Sold	147			151						280	296	621	605	494
Consolidation, Eliminations [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(4)			(3)						(9)	(12)	(18)	(24)	(10)
Depreciation and amortization	0			0						0	0
Depreciation, Depletion and Amortization												0	0	0
General and Administrative Expense	(7)			0						(13)	(4)	(10)	(6)	0
Other Expenses	3			(4)						4	(8)	(8)	(17)	(10)
Costs And Expenses Excluding Cost Of Reimbursable Expense	(4)			(4)						(9)	(12)	(18)	(23)	(10)
Total expenses	(4)			(4)						(9)	(12)	(18)	(23)	(10)
Gain (Loss) on Disposition of Assets													0	0
Operating income	0			1						0	0	0	(1)	0
Interest Expense	0			(2)						0	(3)	0	(1)	0
Foreign Currency Transaction Gain (Loss), before Tax	0			0						0	0	0	0	0
Gain (Loss) on Extinguishment of Debt													0
Other non-operating income, net	0			(3)						0	(3)	0	0	0
Income from continuing operations before income taxes	0			0						0	0	0	0	0
Income Tax Expense (Benefit)	0			0						0	0	0	0	0
Income (Loss) After Taxes Before Income from Subsidiaries Net of Taxes	0			0						0	0	0	0	0
Income (Loss) from Subsidiaries, Net of Tax	(1,181)			(1,009)						(1,932)	(1,777)	(3,567)	(4,901)	523
Net income	(1,181)			(1,009)						(1,932)	(1,777)	(3,567)	(4,901)	(1,002)
Net income attributable to noncontrolling interest	0			0						0	0	0	0	0
Net income attributable to Hilton stockholders	(1,181)			(1,009)						(1,932)	(1,777)	(3,567)	(4,901)	(1,002)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(1,173)			(947)						(1,908)	(1,776)	(3,510)	(5,098)	(785)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	0			0						0	0	0	0	0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(1,173)			(947)						(1,908)	(1,776)	(3,510)	(5,098)	(785)
Income (loss) from continuing operations, net of taxes														523
Income from discontinued operations, net of taxes														(1,525)
Consolidation, Eliminations [Member] | Franchise [Member]
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(4)			(4)						(9)	(8)	(18)	(17)	(10)
Consolidation, Eliminations [Member] | Base and other management fees
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Consolidation, Eliminations [Member] | Incentive management fees
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Consolidation, Eliminations [Member] | Hotel, Owned
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Cost of Goods and Services Sold	0			0						0	0	0	0	0
Consolidation, Eliminations [Member] | Hotel, Other
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			1						0	(4)	0	(7)	0
Consolidation, Eliminations [Member] | Total revenues excluding reimbursable revenues
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(4)			(3)						(9)	(12)	(18)	(24)	(10)
Consolidation, Eliminations [Member] | Reimbursement Revenue
Noncontrolling Interest [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0			0						0	0	0	0	0
Consolidation, Eliminations [Member] | Other expenses from managed and franchised properties
Noncontrolling Interest [Line Items]
Cost of Goods and Services Sold	$ 0			$ 0						$ 0	$ 0	$ 0	$ 0	$ 0

Condensed Consolidated Guaran_6

Condensed Consolidated Guarantor Information Condensed Cash Flow Statement (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2018	Dec. 31, 2015
Noncontrolling Interest [Line Items]
Net Cash Provided by (Used in) Operating Activities	$ 650	$ 532	$ 1,255	$ 849	$ 1,310
Payments to Acquire Property, Plant, and Equipment	46	28	72	58	317
Proceeds from Collection of Notes Receivable			50	7	3
Payments to Acquire Software	44	38	87	75	81
Payments for (Proceeds from) Other Investing Activities	5	9	22	21	28
Net Cash Provided by (Used in) Investing Activities	(95)	(75)	(131)	(147)	(423)
Borrowings	1,795	1,650	1,676	1,824	4,715
Repayments of Debt and Capital Lease Obligations	1,317	672	1,005	1,860	4,359
Debt issuance costs	(27)	(21)
Payments of debt issuance costs and redemption premium			21	69	76
Proceeds from Intercompany Short Term Debt					0
Repayments of Intercompany Debt				0	0
Proceeds from (Payments for) Other Financing Activities	0	0	0	0	0
Payments of Dividends	87	92	181	195	277
Payments for Repurchase of Common Stock	653	1,439	1,721	891	0
Intercompany Dividends	0
Payments to Noncontrolling Interests			1	1	32
Payments Related to Tax Withholding for Share-based Compensation	34	42	44	31	15
Payments to Acquire Additional Interest in Subsidiaries			3	0	0
Net Cash Provided by (Used in) Financing Activities	(323)	(616)	(1,300)	(1,724)	(44)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations	2	(6)	(10)	8	(15)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	234	(165)	(186)	(1,014)	828
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	718	505	484	670	1,183	$ 670	$ 633
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations			0	0	501		223
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations			484	670	1,684		856
Cash Dividends Paid to Guarantors				0	0
Cash transferred in spin-offs of Park and HGV			0	501	0
Payments to Acquire Intercompany Notes Receivable					0
Proceeds from Collection of Intercompany Notes Receivable					0
Parent Company [Member]
Noncontrolling Interest [Line Items]
Net Cash Provided by (Used in) Operating Activities	0	0	0	0	0
Payments to Acquire Property, Plant, and Equipment	0	0	0	0	0
Proceeds from Collection of Notes Receivable			0	0	0
Payments to Acquire Software	0	0	0	0	0
Payments for (Proceeds from) Other Investing Activities	0	0	0	0	0
Net Cash Provided by (Used in) Investing Activities	0	0	0	0	0
Borrowings	0	0	0	0	0
Repayments of Debt and Capital Lease Obligations	0	0	0	0	0
Debt issuance costs	0	0
Payments of debt issuance costs and redemption premium			0	0	0
Proceeds from Intercompany Short Term Debt					0
Repayments of Intercompany Debt				0	0
Proceeds from (Payments for) Other Financing Activities	740	1,531	1,902	1,086	277
Payments of Dividends	87	92	181	195	277
Payments for Repurchase of Common Stock	653	1,439	1,721	891
Intercompany Dividends	0
Payments to Noncontrolling Interests			0	0	0
Payments Related to Tax Withholding for Share-based Compensation	0	0	0	0	0
Payments to Acquire Additional Interest in Subsidiaries			0
Net Cash Provided by (Used in) Financing Activities	0	0	0	0	0
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations	0	0	0	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	0	0	0	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	0	0	0	0	0	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations					0		0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations			0	0	0		0
Cash Dividends Paid to Guarantors				0	0
Cash transferred in spin-offs of Park and HGV				0
Payments to Acquire Intercompany Notes Receivable					0
Proceeds from Collection of Intercompany Notes Receivable					0
HWF Issuers [Member]
Noncontrolling Interest [Line Items]
Net Cash Provided by (Used in) Operating Activities	(85)	(102)	(185)	(113)	(37)
Payments to Acquire Property, Plant, and Equipment	0	0	0	0	0
Proceeds from Collection of Notes Receivable			0	0	0
Payments to Acquire Software	0	0	0	0	0
Payments for (Proceeds from) Other Investing Activities	0	0	0	13	6
Net Cash Provided by (Used in) Investing Activities	0	0	0	(13)	(6)
Borrowings	795	150	175	1,822	0
Repayments of Debt and Capital Lease Obligations	1,295	660	985	1,852	266
Debt issuance costs	(13)	0
Payments of debt issuance costs and redemption premium			0	69	17
Proceeds from Intercompany Short Term Debt					0
Repayments of Intercompany Debt				0	0
Proceeds from (Payments for) Other Financing Activities	598	612	995	225	326
Payments of Dividends	0	0	0	0	0
Payments for Repurchase of Common Stock	0	0	0	0
Intercompany Dividends	0
Payments to Noncontrolling Interests			0	0	0
Payments Related to Tax Withholding for Share-based Compensation	0	0	0	0	0
Payments to Acquire Additional Interest in Subsidiaries			0
Net Cash Provided by (Used in) Financing Activities	85	102	185	126	43
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations	0	0	0	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	0	0	0	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	0	0	0	0	0	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations					0		0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations			0	0	0		0
Cash Dividends Paid to Guarantors				0	0
Cash transferred in spin-offs of Park and HGV				0
Payments to Acquire Intercompany Notes Receivable					0
Proceeds from Collection of Intercompany Notes Receivable					0
HOC [Member]
Noncontrolling Interest [Line Items]
Net Cash Provided by (Used in) Operating Activities	0	(8)	(8)	(103)	0
Payments to Acquire Property, Plant, and Equipment	5	4	9	12	0
Proceeds from Collection of Notes Receivable			0	0	0
Payments to Acquire Software	0	0	0	0	0
Payments for (Proceeds from) Other Investing Activities	0	0	0	0	0
Net Cash Provided by (Used in) Investing Activities	(5)	(4)	(9)	(12)	0
Borrowings	1,000	1,500	1,500	0	1,000
Repayments of Debt and Capital Lease Obligations	14	0	0	0	0
Debt issuance costs	(14)	(21)
Payments of debt issuance costs and redemption premium			21	0	20
Proceeds from Intercompany Short Term Debt					0
Repayments of Intercompany Debt				(3)	0
Proceeds from (Payments for) Other Financing Activities	(933)	(1,451)	(1,444)	122	(890)
Payments of Dividends	0	0	0	0	0
Payments for Repurchase of Common Stock	0	0	0	0
Intercompany Dividends	0
Payments to Noncontrolling Interests			0	0	0
Payments Related to Tax Withholding for Share-based Compensation	34	42	44	31	0
Payments to Acquire Additional Interest in Subsidiaries			0
Net Cash Provided by (Used in) Financing Activities	5	(14)	(9)	88	90
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations	0	0	0	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	0	(26)	(26)	(27)	90
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	37	37	37	63	90	63	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations					0		0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations			37	63	90		0
Cash Dividends Paid to Guarantors					0
Cash transferred in spin-offs of Park and HGV				0
Payments to Acquire Intercompany Notes Receivable					0
Proceeds from Collection of Intercompany Notes Receivable					0
Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Net Cash Provided by (Used in) Operating Activities	675	494	1,267	950	866
Payments to Acquire Property, Plant, and Equipment	3	1	7	12	9
Proceeds from Collection of Notes Receivable			49	7	2
Payments to Acquire Software	44	38	87	75	73
Payments for (Proceeds from) Other Investing Activities	(1)	3	6	8	37
Net Cash Provided by (Used in) Investing Activities	(46)	(42)	(51)	(88)	(117)
Borrowings	0	0	0	0	0
Repayments of Debt and Capital Lease Obligations	0	0	0	0	0
Debt issuance costs	0	0
Payments of debt issuance costs and redemption premium			0	0	0
Proceeds from Intercompany Short Term Debt					42
Repayments of Intercompany Debt				0	0
Proceeds from (Payments for) Other Financing Activities	(622)	(450)	(1,209)	(865)	(854)
Payments of Dividends	0	0	0	0	0
Payments for Repurchase of Common Stock	0	0	0	0
Intercompany Dividends	0
Payments to Noncontrolling Interests			0	0	0
Payments Related to Tax Withholding for Share-based Compensation	0	0	0	0	15
Payments to Acquire Additional Interest in Subsidiaries			3
Net Cash Provided by (Used in) Financing Activities	(622)	(450)	(1,212)	(865)	(827)
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations	0	0	0	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	7	2	4	(3)	(78)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	39	30	32	28	31	28	109
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations					0		0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations			32	28	31		109
Cash Dividends Paid to Guarantors				0	0
Cash transferred in spin-offs of Park and HGV				0
Payments to Acquire Intercompany Notes Receivable					(192)
Proceeds from Collection of Intercompany Notes Receivable					192
Non-Guarantor Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Net Cash Provided by (Used in) Operating Activities	75	148	181	285	1,086
Payments to Acquire Property, Plant, and Equipment	38	23	56	34	308
Proceeds from Collection of Notes Receivable			1	0	1
Payments to Acquire Software	0	0	0	0	8
Payments for (Proceeds from) Other Investing Activities	6	6	16	(3)	(15)
Net Cash Provided by (Used in) Investing Activities	(44)	(29)	(71)	(31)	(342)
Borrowings	0	0	1	2	3,715
Repayments of Debt and Capital Lease Obligations	8	12	20	8	4,093
Debt issuance costs	0	0
Payments of debt issuance costs and redemption premium			0	0	39
Proceeds from Intercompany Short Term Debt					192
Repayments of Intercompany Debt				0	(192)
Proceeds from (Payments for) Other Financing Activities	217	(242)	(244)	(568)	1,141
Payments of Dividends	0	0	0	0	0
Payments for Repurchase of Common Stock	0	0	0	0
Intercompany Dividends	(15)
Payments to Noncontrolling Interests			1	1	32
Payments Related to Tax Withholding for Share-based Compensation	0	0	0	0	0
Payments to Acquire Additional Interest in Subsidiaries			0
Net Cash Provided by (Used in) Financing Activities	194	(254)	(264)	(1,246)	87
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations	2	(6)	(10)	8	(15)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	227	(141)	(164)	(984)	816
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	642	438	415	579	1,062	579	524
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations					501		223
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations			415	579	1,563		747
Cash Dividends Paid to Guarantors				(170)	(605)
Cash transferred in spin-offs of Park and HGV				501
Payments to Acquire Intercompany Notes Receivable					(42)
Proceeds from Collection of Intercompany Notes Receivable					0
Consolidation, Eliminations [Member]
Noncontrolling Interest [Line Items]
Net Cash Provided by (Used in) Operating Activities	(15)	0	0	(170)	(605)
Payments to Acquire Property, Plant, and Equipment	0	0	0	0	0
Proceeds from Collection of Notes Receivable			0	0	0
Payments to Acquire Software	0	0	0	0	0
Payments for (Proceeds from) Other Investing Activities	0	0	0	3	0
Net Cash Provided by (Used in) Investing Activities	0	0	0	(3)	(42)
Borrowings	0	0	0	0	0
Repayments of Debt and Capital Lease Obligations	0	0	0	0	0
Debt issuance costs	0	0
Payments of debt issuance costs and redemption premium			0	0	0
Proceeds from Intercompany Short Term Debt					(234)
Repayments of Intercompany Debt				3	192
Proceeds from (Payments for) Other Financing Activities	0	0	0	0	0
Payments of Dividends	0	0	0	0	0
Payments for Repurchase of Common Stock	0	0	0	0
Intercompany Dividends	15
Payments to Noncontrolling Interests			0	0	0
Payments Related to Tax Withholding for Share-based Compensation	0	0	0	0	0
Payments to Acquire Additional Interest in Subsidiaries			0
Net Cash Provided by (Used in) Financing Activities	15	0	0	173	563
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations	0	0	0	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	0	0	0	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 0	$ 0	0	0	0	$ 0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Disposal Group, Including Discontinued Operations					0		0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations			$ 0	0	0		$ 0
Cash Dividends Paid to Guarantors				170	605
Cash transferred in spin-offs of Park and HGV				$ 0
Payments to Acquire Intercompany Notes Receivable					234
Proceeds from Collection of Intercompany Notes Receivable					$ (192)

Selected Quarterly Financial _3

Selected Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended									6 Months Ended		12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,484	$ 2,288	$ 2,253	$ 2,291	$ 2,074	$ 2,068	$ 2,091	$ 2,076	$ 1,896	$ 4,688	$ 4,365	$ 8,906	$ 8,131	$ 6,576
Operating income	478	362	385	406	279	259	332	324	217	790	685	1,432	1,132	868
Net income	261	225	164	217	163	730	160	151	48	420	380	769	1,089	354
Net income attributable to Hilton stockholders	$ 260	$ 224	$ 162	$ 217	$ 161	$ 729	$ 158	$ 150	$ 47	$ 418	$ 378	$ 764	$ 1,084	$ 338
Earnings Per Share, Basic	$ 0.90	$ 0.76	$ 0.55	$ 0.72	$ 0.51	$ 2.29	$ 0.49	$ 0.46	$ 0.14	$ 1.43	$ 1.22	$ 2.53	$ 3.34	$ 1.03
Earnings Per Share, Diluted	$ 0.89	$ 0.75	$ 0.54	$ 0.71	$ 0.51	$ 2.27	$ 0.49	$ 0.46	$ 0.14	$ 1.42	$ 1.21	$ 2.50	$ 3.32	$ 1.03