Stock-Based Compensation Stock-Based Compensation - CIE Stock Option Grants and Exercises (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted	1,500,770		550,812		8,173,944
Weighted Average Grant-Date Fair Value per share	$ 10.27	[1]	$ 5.95	[1]	$ 3.50	[1]
Weighted Average Exercise Price Granted	$ 21.18	[1],[2]	$ 13.65	[1],[2]	$ 8.44	[1],[2]
Shares Exercised	317,703		143,109		0
Stock Issued During Period, Value, Stock Options Exercised	$ 3		$ 1		$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	2		2		0
Caesars Interactive Entertainment [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options granted	1,135		6,300		1,442
Weighted Average Grant-Date Fair Value per share	$ 4,717.02	[1]	$ 2,620.48	[1]	$ 2,724.86	[1]
Weighted Average Exercise Price Granted	$ 9,976.43		$ 5,539.98		$ 5,360.86
Shares Exercised	3,822		365		0
Stock Issued During Period, Value, Stock Options Exercised	6		1		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 27		$ 1		$ 0

[1] Represents the weighted-average grant date fair value per option, using the Monte Carlo simulation option-pricing model for performance-based options, and the Black-Scholes option-pricing model for time-based options.

[2] Adjusted for the February 2012 1.742-for-1 stock split.