Stock-Based Compensation Stock-Based Compensation - Stock Option and Restricted Stock Unit Activity (Details) - $ / shares		6 Months Ended
		Jun. 30, 2018		Dec. 31, 2017
Stock options (3)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	[2]	8,764,136	[1]	9,227,890
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	[2],[3]	$ 10.45		$ 10.36
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		424,612
Restricted stock units and awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	[4]	17,103,637	[1]	17,274,659
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	[3],[4]	$ 11.72		$ 11.22
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		4,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period		3,647,545
Performance stock units (5)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	[5]	1,600,000	[3],[6]	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	[5],[7]	$ 10.70		$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		0

[1] (1) During the six months ended June 30, 2018, 4.1 million RSUs were issued under the 2017 Performance Incentive Plan. There were no grants of stock options during the six months ended June 30, 2018.

[2] (3) During the six months ended June 30, 2018, 424,612 stock options were exercised.

[3] (2) Represents weighted average exercise price for stock options, weighted average grant date fair value for RSUs, and the price of CEC common stock as of the balance sheet date for PSUs.

[4] (4) During the six months ended June 30, 2018, 3,647,545 restricted stock units vested.

[5] (5) No PSUs have vested during the six months ended June 30, 2018.

[6] The conditions that were considered prohibited forms of continuing involvement related to our sale of the Golf Course Properties (see Note 7) are no longer considered continuing involvement under the new revenue recognition standard. As of result of adopting the new standard on a full retrospective basis, we are now reflecting this transaction as a completed sale in the period in which it occurred.

[7] Adjustments are primarily related to the reclassification of assets and liabilities in accordance with the new accounting and disclosure requirements.Effect of Adopting New Revenue Recognition Standard - Statements of Operations Three Months Ended June 30, 2017 Prior to Adoption Post Adoption(In millions)CEC CAC Eliminations Total TotalNet revenues$1,002 $— $— $1,002 $1,008Total operating expenses845 8 — 853 859Income/(loss) from operations157 (8) — 149 149Net loss(1,426) (3) (5) (1,434) (1,432)