Goodwill and Other Intangible Assets - Carrying Value and Accumulated Amortization for Each Major Class of Intangible Assets Other Than Goodwill (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Intangible Assets Excluding Goodwill [Line Items]
Gross Carrying Amount	$ 1,058	$ 1,584
Accumulated Amortization	(663)	(948)
Net Carrying Amount	395	636	$ 730
Carrying value and accumulated amortization for each major class of intangible assets other than goodwill
Non amortizing intangible assets	148	2,514	2,758
Total intangible assets other than goodwill	543	3,150	$ 3,488
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 5 months
Gross Carrying Amount	$ 917	1,265
Accumulated Amortization	(589)	(736)
Net Carrying Amount	$ 328	529
Contract rights [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	9 years 1 month
Gross Carrying Amount	$ 3	84
Accumulated Amortization	(1)	(81)
Net Carrying Amount	$ 2	3
Patented technology [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	2 years 2 months
Gross Carrying Amount	$ 86	188
Accumulated Amortization	(49)	(109)
Net Carrying Amount	$ 37	79
Gaming Rights [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	8 years 4 months
Gross Carrying Amount	$ 52	47
Accumulated Amortization	(24)	(22)
Net Carrying Amount	$ 28	$ 25