Products and Services Revenues (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 segment category	Sep. 30, 2012
Products and Services Revenues
Number of categories of products and services revenues (categories)			4
Total operating revenues	$ 2,848	$ 2,825	$ 8,484	$ 8,500
USF and surcharges included in operating revenues and expenses	90	95	278	298
Number of reportable segments (segments)			1
Strategic services
Products and Services Revenues
Total operating revenues	1,313	1,258	3,886	3,715
Legacy services
Products and Services Revenues
Total operating revenues	1,113	1,197	3,395	3,681
Data integration
Products and Services Revenues
Total operating revenues	138	137	385	393
Affiliates and other services
Products and Services Revenues
Total operating revenues	$ 284	$ 233	$ 818	$ 711