Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Restrictions on Cash and Cash Equivalents [Table Text Block]

Reconciliation to Statements of Cash Flows
	As of December 31,
(In millions)	2017		2016
Cash and cash equivalents	$	2,558	$	1,540
Restricted cash, current	116		3,113
Restricted cash, non-current	35		5
Total cash, cash equivalents, and restricted cash	$	2,709	$	4,658

Financing Receivables [Text Block]

Acquired Markers Accretable Yield
(In millions)	2017
Balance as of October 6	$	8
Accretion	(2		)
Balance as of December 31	$	6

Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

Allowance for Doubtful Accounts
(In millions)	2017			2016			2015
Balance as of January 1	$	41		$	48		$	196
Provision for doubtful accounts	8			11			11
Write-offs less recoveries	(18		)	(18		)	3
CEOC deconsolidation	—			—			(162		)
OpCo consolidation (1)	20			—			—
Balance as of December 31	$	51		$	41		$	48

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⁽¹⁾  See Note 4 for further details relating to the acquisition of OpCo.

Property, Plant and Equipment, Estimated Useful Lives [Table Text Block]

Useful Lives
Land improvements			12	years
Buildings	20	to	40	years
Building and leasehold improvements	5	to	20	years
Riverboats and barges			30	years
Furniture, fixtures, and equipment	2.5	to	20	years