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Increase (Decrease) In Working Capital

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Increase (Decrease) in Capitalized Contract Costs, Net

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Increase (Decrease) in Contract with Customer, Liability, Cash

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The non-cash component of income tax expense, less the tax benefit from exercise of stock options.

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The cash outflow from advancing money to others in the form of loans.

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The net cash inflow (outflow) from issuing (borrowing) and repaying commercial paper or line of credit having initial term of repayment greater than one year or the normal operating cycle, if longer.

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount of expense (income) related to the increase (decrease) in reserve for business combination costs. Includes, but is not limited to, legal, accounting, and other costs incurred to consummate the merger.

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Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example, cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities).

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Amount of cash (inflow) outflow from investing activities classified as other.

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The cash outflow to reacquire common stock during the period.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

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Basis of Presentation - Effect of Adoption of ASU 2014-09 on Statement of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
OPERATING ACTIVITIES
Net income	$ 610	$ 489	$ 1,008	$ 860
Adjustments to reconcile to cash provided by operating activities:
Depreciation, amortization, and other			143	145
Share-based compensation			93	95
Income taxes			(198)	148
Contract acquisition costs			(71)	(89)
Merger-related charges			(23)	(98)
Working capital changes			(241)	(113)
Gain on asset dispositions			(173)	(24)
Other			49	78
Net cash provided by (used in) operating activities			1,129	1,186
INVESTING ACTIVITIES
Capital expenditures			(388)	(104)
Dispositions			436	482
Loan advances			(13)	(48)
Loan collections			29	10
Other			50	(17)
Net cash provided by investing activities			114	323
FINANCING ACTIVITIES
Commercial paper/Credit Facility, net			707	119
Issuance of long-term debt			443	1
Repayment of long-term debt			(387)	(301)
Issuance of Class A Common Stock			4	3
Dividends paid			(262)	(240)
Purchase of treasury stock			(1,673)	(1,328)
Share-based compensation withholding taxes			(101)	(135)
Net cash provided by (used in) financing activities			(1,269)	(1,881)
DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH			(26)	(372)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period			429	887
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period	$ 403	515	403	515
Liability for guest loyalty programs
Adjustments to reconcile to cash provided by operating activities:
Liability for guest loyalty programs			551
Increase (Decrease) in Contract with Customer, Liability, Cash			$ 542	184
As Previously Reported
OPERATING ACTIVITIES
Net income		414		779
Adjustments to reconcile to cash provided by operating activities:
Depreciation, amortization, and other				150
Share-based compensation				95
Income taxes				96
Contract acquisition costs				0
Merger-related charges				(98)
Working capital changes				(6)
Gain on asset dispositions				(24)
Other				106
Net cash provided by (used in) operating activities				1,302
INVESTING ACTIVITIES
Capital expenditures				(104)
Dispositions				482
Loan advances				(48)
Loan collections				10
Contract acquisition costs				(91)
Other				(16)
Net cash provided by investing activities				233
FINANCING ACTIVITIES
Commercial paper/Credit Facility, net				105
Issuance of long-term debt				1
Repayment of long-term debt				(301)
Issuance of Class A Common Stock				3
Dividends paid				(240)
Purchase of treasury stock				(1,328)
Share-based compensation withholding taxes				(135)
Net cash provided by (used in) financing activities				(1,895)
DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH				(360)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period				858
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period		498		498
As Previously Reported \| Liability for guest loyalty programs
Adjustments to reconcile to cash provided by operating activities:
Liability for guest loyalty programs				204
Adjustment \| Adoption of ASU 2014-09
OPERATING ACTIVITIES
Net income		75		81
Adjustments to reconcile to cash provided by operating activities:
Depreciation, amortization, and other				(5)
Share-based compensation				0
Income taxes				52
Contract acquisition costs				(89)
Merger-related charges				0
Working capital changes				(95)
Gain on asset dispositions				0
Other				(14)
Net cash provided by (used in) operating activities				(90)
INVESTING ACTIVITIES
Capital expenditures				0
Dispositions				0
Loan advances				0
Loan collections				0
Contract acquisition costs				91
Other				(1)
Net cash provided by investing activities				90
FINANCING ACTIVITIES
Commercial paper/Credit Facility, net				0
Issuance of long-term debt				0
Repayment of long-term debt				0
Issuance of Class A Common Stock				0
Dividends paid				0
Purchase of treasury stock				0
Share-based compensation withholding taxes				0
Net cash provided by (used in) financing activities				0
DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH				0
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period				0
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period		0		0
Adjustment \| Adoption of ASUs 2016-18 and 2016-15
OPERATING ACTIVITIES
Net income				0
Adjustments to reconcile to cash provided by operating activities:
Depreciation, amortization, and other				0
Share-based compensation				0
Income taxes				0
Contract acquisition costs				0
Merger-related charges				0
Working capital changes				(12)
Gain on asset dispositions				0
Other				(14)
Net cash provided by (used in) operating activities				(26)
INVESTING ACTIVITIES
Capital expenditures				0
Dispositions				0
Loan advances				0
Loan collections				0
Contract acquisition costs				0
Other				0
Net cash provided by investing activities				0
FINANCING ACTIVITIES
Commercial paper/Credit Facility, net				14
Issuance of long-term debt				0
Repayment of long-term debt				0
Issuance of Class A Common Stock				0
Dividends paid				0
Purchase of treasury stock				0
Share-based compensation withholding taxes				0
Net cash provided by (used in) financing activities				14
DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH				(12)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, beginning of period				29
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, end of period		$ 17		17
Adjustment \| Liability for guest loyalty programs \| Adoption of ASU 2014-09
Adjustments to reconcile to cash provided by operating activities:
Liability for guest loyalty programs				(20)
Adjustment \| Liability for guest loyalty programs \| Adoption of ASUs 2016-18 and 2016-15
Adjustments to reconcile to cash provided by operating activities:
Liability for guest loyalty programs				$ 0