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

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Restrictions on Cash and Cash Equivalents [Table Text Block]

Reconciliation to Statements of Cash Flows
	As of December 31,
(In millions)	2018		2017
Cash and cash equivalents	$	1,491	$	2,558
Restricted cash, current	115		116
Restricted cash, non-current	51		35
Total cash, cash equivalents, and restricted cash	$	1,657	$	2,709

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

Useful Lives
Land improvements			12	years
Buildings	5	to	40	years
Building and leasehold improvements	3	to	30	years
Riverboats and barges			30	years
Furniture, fixtures, and equipment	2.5	to	12	years