Acquisition Accounting - Components of Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended
	Apr. 30, 2013
Directory services agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated remaining useful lives	5 years
Client relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated remaining useful lives	3 years
Trademarks and domain names
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated remaining useful lives	5 years
Patented technologies
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated remaining useful lives	4 years
Super Media, Inc.
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of intangible assets	$ 635
Super Media, Inc. | Directory services agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of intangible assets	145
Super Media, Inc. | Client relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of intangible assets	420
Super Media, Inc. | Trademarks and domain names
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of intangible assets	60
Super Media, Inc. | Patented technologies
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value of intangible assets	$ 10