Goodwill and Other Intangible Assets - Carrying Value and Accumulated Amortization for Each Major Class of Intangible Assets Other Than Goodwill (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Intangible Assets Excluding Goodwill [Line Items]
Gross Carrying Amount	$ 939	$ 939
Accumulated Amortization	(687)	(654)
Net Carrying Amount	252	285
Carrying value and accumulated amortization for each major class of intangible assets other than goodwill
Non-amortizing intangible assets	148	148
Intangible assets other than goodwill	400	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	$ 22	22
Customer relationships
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	4 years
Gross Carrying Amount	$ 893	893
Accumulated Amortization	(661)	(630)
Net Carrying Amount	$ 232	263
Contract rights
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	7 years 6 months
Gross Carrying Amount	$ 3	3
Accumulated Amortization	(1)	(1)
Net Carrying Amount	$ 2	2
Gaming rights
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	7 years
Gross Carrying Amount	$ 43	43
Accumulated Amortization	(25)	(23)
Net Carrying Amount	$ 18	$ 20