Property and Equipment (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment
Property and equipment, gross	$ 5,319,000,000		$ 5,319,000,000	$ 4,142,000,000
Less: Accumulated depreciation	(1,616,000,000)		(1,616,000,000)	(1,260,000,000)
Property and equipment, net	3,703,000,000		3,703,000,000	2,882,000,000
Interest costs capitalized	0	0	0
Land
Property, Plant and Equipment
Property and equipment, gross	153,000,000		153,000,000	45,000,000
Buildings
Property, Plant and Equipment
Property and equipment, gross	1,347,000,000		1,347,000,000	1,071,000,000
Leasehold improvements
Property, Plant and Equipment
Property and equipment, gross	279,000,000		279,000,000	203,000,000
Network Equipment
Property, Plant and Equipment
Property and equipment, gross	2,704,000,000		2,704,000,000	2,351,000,000
Computer software, office equipment and other
Property, Plant and Equipment
Property and equipment, gross	134,000,000		134,000,000	95,000,000
Construction in progress
Property, Plant and Equipment
Property and equipment, gross	$ 702,000,000		$ 702,000,000	$ 377,000,000