Goodwill and Other Intangible Assets - Carrying Value and Accumulated Amortization for Each Major Class of Intangible Assets Other Than Goodwill (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Intangible Assets Excluding Goodwill [Line Items]
Gross Carrying Amount	$ 1,057	$ 1,584
Accumulated Amortization	(619)	(948)
Net Carrying Amount	438	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	586	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)	5 years 11 months
Gross Carrying Amount	$ 893	1,265
Accumulated Amortization	(536)	(736)
Net Carrying Amount	$ 357	529
Contract rights [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	9 years 7 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 7 months
Gross Carrying Amount	$ 118	188
Accumulated Amortization	(62)	(109)
Net Carrying Amount	$ 56	79
Gaming rights [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	9 years 1 month
Gross Carrying Amount	$ 43	47
Accumulated Amortization	(20)	(22)
Net Carrying Amount	$ 23	$ 25