Goodwill and Intangible Assets, Net - Components of Intangible Assets with Definite Lives (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	5 years 4 months 24 days
Gross Carrying Amount	$ 217	$ 198
Accumulated Amortization	(80)	(52)
Intangible assets with definite lives, net	$ 137	146
Trade Names and Trademarks
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	7 years 9 months 18 days
Gross Carrying Amount	$ 56	53
Accumulated Amortization	(14)	(9)
Intangible assets with definite lives, net	$ 42	44
Customer Lists and Supplier Relationships
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	4 years 7 months 6 days
Gross Carrying Amount	$ 84	82
Accumulated Amortization	(31)	(20)
Intangible assets with definite lives, net	$ 53	62
Subscriber Relationships
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	4 years 9 months 18 days
Gross Carrying Amount	$ 33	29
Accumulated Amortization	(15)	(9)
Intangible assets with definite lives, net	$ 18	20
Technology and Other
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	3 years 4 months 24 days
Gross Carrying Amount	$ 44	34
Accumulated Amortization	(20)	(14)
Intangible assets with definite lives, net	$ 24	$ 20