Debt Debt - Cash Flows from Financing Activities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2013
Proceeds from the issuance of long-term debt	$ 4,436	$ 6,039	$ 4,162
Repayments of Long-term Debt	(2,833)
Long-term Debt, Other [Member]
Proceeds from the issuance of long-term debt	13
Repayments of Long-term Debt	(214)
Capital Lease Obligations [Member]
Proceeds from the issuance of long-term debt	0
Repayments of Long-term Debt	(34)
Caesars Entertainment Operating Company [Member]
Repayments of Long-term Debt				(1,400)
Caesars Entertainment Operating Company [Member] | Medium-term Notes [Member]
Repayments of Long-term Debt	(794)
Caesars Entertainment Operating Company [Member] | Medium-term Notes [Member] | Term Loan B Seven [Member]
Proceeds from the issuance of long-term debt	1,528
Repayments of Long-term Debt	(1,275)
Caesars Growth Partners, LLC [Member]
Proceeds from the issuance of long-term debt	693
Repayments of Long-term Debt	(700)
Caesars Growth Partners, LLC [Member] | Medium-term Notes [Member]
Proceeds from the issuance of long-term debt	106
Repayments of Long-term Debt	0
Caesars Growth Partners, LLC [Member] | Secured Debt [Member]
Proceeds from the issuance of long-term debt	1,141
Repayments of Long-term Debt	0
Caesars Growth Partners, LLC [Member] | Subordinated Debt [Member]
Proceeds from the issuance of long-term debt	660
Repayments of Long-term Debt	0
Caesars Growth Partners, LLC [Member] | Senior Secured Loan [Member]
Proceeds from the issuance of long-term debt	0
Repayments of Long-term Debt	(495)
Caesars Entertainment Resort Properties [Member] | Secured Debt [Member] | Senior Secured Revolving Facility [Member]
Proceeds from the issuance of long-term debt	295
Repayments of Long-term Debt	$ (115)