Business Combinations, Definite-Lived Intangible Assets, Net and Goodwill (Intangible Assets Detail) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,085		$ 1,085		$ 1,084
Accumulated Amortization	(403)		(403)		(336)
Net Book Value	682		682		$ 748
Amortization Expense	37	$ 36	$ 74	$ 67
Purchased technology
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Useful Lives (in years)			6 years 5 months 26 days		6 years 5 months 25 days
Gross Carrying Amount	698		$ 698		$ 699
Accumulated Amortization	(299)		(299)		(252)
Net Book Value	399		$ 399		$ 447
Leasehold interest
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Useful Lives (in years)			34 years 10 months 24 days		34 years 10 months 24 days
Gross Carrying Amount	149		$ 149		$ 149
Accumulated Amortization	(18)		(18)		(15)
Net Book Value	131		$ 131		$ 134
Customer relationships and customer lists
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Useful Lives (in years)			8 years 2 months 12 days		8 years 2 months 13 days
Gross Carrying Amount	157		$ 157		$ 157
Accumulated Amortization	(62)		(62)		(53)
Net Book Value	95		$ 95		$ 104
Trademarks and tradenames
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Useful Lives (in years)			8 years 7 months 15 days		8 years 7 months 15 days
Gross Carrying Amount	61		$ 61		$ 61
Accumulated Amortization	(13)		(13)		(9)
Net Book Value	48		$ 48		$ 52
Other
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Useful Lives (in years)			2 years 10 months 9 days		2 years 8 months 21 days
Gross Carrying Amount	20		$ 20		$ 18
Accumulated Amortization	(11)		(11)		(7)
Net Book Value	$ 9		$ 9		$ 11