Goodwill and Other Intangible Assets - Carrying Value and Accumulated Amortization for Each Major Class of Intangible Assets Other Than Goodwill (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Intangible Assets Excluding Goodwill [Line Items]
Gross Carrying Amount	$ 939	$ 939
Accumulated Amortization	(703)	(654)
Net Carrying Amount	236	285
Carrying value and accumulated amortization for each major class of intangible assets other than goodwill
Non-amortizing intangible assets	126	148
Intangible assets other than goodwill	362	433
Trademarks
Carrying value and accumulated amortization for each major class of intangible assets other than goodwill
Non-amortizing intangible assets	126	126
Gaming rights
Carrying value and accumulated amortization for each major class of intangible assets other than goodwill
Non-amortizing intangible assets	$ 0	22
Customer relationships
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	3 years 8 months
Gross Carrying Amount	$ 893	893
Accumulated Amortization	(676)	(630)
Net Carrying Amount	$ 217	263
Contract rights
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	7 years 3 months
Gross Carrying Amount	$ 3	3
Accumulated Amortization	(2)	(1)
Net Carrying Amount	$ 1	2
Gaming rights
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	6 years 9 months
Gross Carrying Amount	$ 43	43
Accumulated Amortization	(25)	(23)
Net Carrying Amount	$ 18	$ 20