Goodwill and Other Intangible Assets - Impairment Charges for Goodwill and Other Non-Amortizing Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Schedule of Impairment Charges for Goodwill and Other Non-Amortizing Intangible Assets [Line Items]
Goodwill, Impairment Loss		$ (710)	[1]	$ (104)
Impairment of intangible assets other than goodwill		240		200
Continuing Operations [Member]
Schedule of Impairment Charges for Goodwill and Other Non-Amortizing Intangible Assets [Line Items]
Goodwill, Impairment Loss	406	695	[2]	104	195
Total impairment charges		934		450	437
Continuing Operations [Member] | Trademarks [Member]
Schedule of Impairment Charges for Goodwill and Other Non-Amortizing Intangible Assets [Line Items]
Impairment of intangible assets other than goodwill		13		101	209
Continuing Operations [Member] | Gaming Rights and other [Member]
Schedule of Impairment Charges for Goodwill and Other Non-Amortizing Intangible Assets [Line Items]
Impairment of intangible assets other than goodwill	$ 40	$ 226	[3]	$ 245	$ 33

[1] CIE impairment during 2014 related to CIE RMG BEL, LLC is included in discontinued operations. (See Note 6, “Acquisitions, Dispositions, and Other Property Matters.”)

[2] Includes $406 million of impairments recorded in the fourth quarter of 2014

[3] Includes $40 million of impairments recorded in the fourth quarter of 2014