Income Taxes (Details 2) (USD $)	12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Savvis	Jul. 15, 2011 Savvis	Dec. 31, 2013 Qwest	Apr. 02, 2011 Qwest	Dec. 31, 2013 federal	Dec. 31, 2011 federal	Dec. 31, 2013 State Jurisdiction	Dec. 31, 2013 Investment tax credits	Dec. 31, 2013 Investment tax credits State Jurisdiction	Dec. 31, 2013 Alternative minimum tax credits
Income taxes
Net current deferred tax asset recognized in connection with Qwest acquisition						$ 289,000,000
Net noncurrent deferred tax liabilities				279,000,000		533,000,000
Operating loss carryforward							2,900,000,000		12,400,000,000
Tax credit carryforwards											50,000,000	91,000,000
Tax credit carryforwards, net of federal income tax										33,000,000
Valuation allowance	435,000,000	444,000,000
Deferred tax asset valuation allowance adjustment	(9,000,000)		18,000,000		403,000,000		5,000,000	(16,000,000)
Unrecognized tax benefits that would impact effective tax rate	29,000,000	52,000,000
Interest on income taxes accrued	30,000,000	33,000,000
Amount of unrecorded benefit	$ 8,000,000