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	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Intangible Assets Excluding Goodwill [Line Items]
Gross Carrying Amount	$ 1,057	$ 1,584
Accumulated Amortization	(596)	(948)
Net Carrying Amount	461	636
Carrying value and accumulated amortization for each major class of intangible assets other than goodwill
Non-amortizing intangible assets	148	2,514
Intangible assets other than goodwill	609	3,150
Gaming rights [Member]
Carrying value and accumulated amortization for each major class of intangible assets other than goodwill
Non-amortizing intangible assets	22	934
Trademarks [Member]
Carrying value and accumulated amortization for each major class of intangible assets other than goodwill
Non-amortizing intangible assets	126	1,580
Customer relationships [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	6 years 2 months
Gross Carrying Amount	893	1,265
Accumulated Amortization	(521)	(736)
Net Carrying Amount	372	529
Contract rights [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	9 years 10 months
Gross Carrying Amount	3	84
Accumulated Amortization	(1)	(81)
Net Carrying Amount	2	3
Developed technology rights [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	2 years 11 months
Gross Carrying Amount	118	188
Accumulated Amortization	(56)	(109)
Net Carrying Amount	62	79
Gaming rights [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	9 years 4 months
Gross Carrying Amount	43	47
Accumulated Amortization	(18)	(22)
Net Carrying Amount	$ 25	$ 25