Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Unrecognized Tax Benefits [Roll Forward]
Beginning Balance	$ 80	$ 142	$ 333
Additions based on tax positions related to the current year	3	20	1
Additions for tax positions of prior years	2	0	7
Reductions for tax positions for prior years	0	(2)	(50)
Deconsolidation of CEOC	(78)	0	0
Settlements	0	0	(82)
Expiration of statutes	0	(80)	(67)
Ending Balance	$ 7	$ 80	$ 142