Fair Value Measurements Fair Value Measurements - Changes in Level 3 Fair Value Measurements (Details) - Liability [Member] - Estimate of Fair Value Measurement [Member] - Fair Value, Measurements, Recurring [Member] - Fair Value, Inputs, Level 3 [Member] $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance as of beginning of period	$ 112
Restructuring of CEOC and other	(10)
Balance as of end of period	102
CEC Convertible Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance as of beginning of period	1,016
Restructuring of CEOC and other	(160)
Balance as of end of period	$ 856