Goodwill and Other Intangible Assets - Carrying Value and Accumulated Amortization for Each Major Class of Intangible Assets Other Than Goodwill (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Intangible Assets Excluding Goodwill [Line Items]
Gross Carrying Amount	$ 1,584	$ 1,547
Accumulated Amortization	(948)	(817)
Net Carrying Amount	636	730	1,028
Carrying value and accumulated amortization for each major class of intangible assets other than goodwill
Non amortizing intangible assets	2,514	2,758	2,958
Total intangible assets other than goodwill	3,150	3,488	3,986
Trademarks [Member]
Carrying value and accumulated amortization for each major class of intangible assets other than goodwill
Non amortizing intangible assets	1,580	1,598
Gaming Rights [Member]
Carrying value and accumulated amortization for each major class of intangible assets other than goodwill
Non amortizing intangible assets	934	1,160
Customer relationships [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	6 years 2 months
Gross Carrying Amount	1,265	1,268
Accumulated Amortization	(736)	(646)
Net Carrying Amount	529	622
Contract rights [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	2 years 1 month
Gross Carrying Amount	84	98
Accumulated Amortization	(81)	(79)
Net Carrying Amount	3	19
Patented technology [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	2 years 5 months
Gross Carrying Amount	188	138
Accumulated Amortization	(109)	(77)
Net Carrying Amount	79	61
Gaming Rights [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	9 years 7 months
Gross Carrying Amount	47	43
Accumulated Amortization	(22)	(15)
Net Carrying Amount	$ 25	$ 28