Merger Transaction and Integration Costs (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Business Acquisition [Line Items]
Accumulated merger transaction costs	$ 41		$ 41
Merger transaction costs	2	4	21	4
Merger integration costs	13	0	41	0
Total merger related costs	15	4	62	4
Dex One
Business Acquisition [Line Items]
Deferred financing costs	8		8
General and Administrative Expense
Business Acquisition [Line Items]
Merger transaction costs	2		21
Employee Severance
Business Acquisition [Line Items]
Merger integration costs	$ 9		$ 28