Basis of Presentation and Summary of Significant Accounting Policies-Intangible Assets (Details) (USD $) In Millions, unless otherwise specified			12 Months Ended				12 Months Ended
	Dec. 31, 2013 Customer relationship	Dec. 31, 2012 Customer relationship	Dec. 31, 2013 Customer relationship Minimum	Dec. 31, 2013 Customer relationship Maximum	Dec. 31, 2013 Capitalized software	Dec. 31, 2012 Capitalized software	Dec. 31, 2013 Capitalized software Maximum	Dec. 31, 2013 Integrated Billing and Customer Care System	Dec. 31, 2013 Other
Goodwill and intangible assets
Estimated useful life			10 years	15 years			7 years	20 years	4 years
Finite lived intangible assets, net	$ 5,935	$ 7,052			$ 1,415	$ 1,522		$ 237