Long-Term Debt - Cash Flows from Financing Activities Related to Long-Term Debt and Capital Lease Obligations (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Debt Instrument [Line Items]
Proceeds from long-term debt	$ 2,093	$ 654
Repayments of long-term debt and capital leases	(313)	(250)
Secured Debt [Member] \| 2013 U.S. Credit Facility [Member] \| United States [Member]
Debt Instrument [Line Items]
Proceeds from long-term debt	1,347	5
Repayments of long-term debt	(9)	(52)
Secured Debt [Member] \| 2016 VML Credit Facility [Member] \| Macao [Member]
Debt Instrument [Line Items]
Proceeds from long-term debt	746	649
Repayments of long-term debt	(269)	(107)
Secured Debt [Member] \| 2012 Singapore Credit Facility [Member] \| Singapore [Member]
Debt Instrument [Line Items]
Repayments of long-term debt	(33)	(33)
Secured Debt [Member] \| Airplane Financings [Member] \| United States [Member]
Debt Instrument [Line Items]
Repayments of long-term debt	0	(56)
Other Long-Term Debt And Capital Lease Obligations [Member] \| HVAC Equipment Lease and Other Long-Term Debt [Member]
Debt Instrument [Line Items]
Repayments of long-term debt and capital leases	$ (2)	$ (2)

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No definition available.

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- Definition

The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

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- Definition

The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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