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Earnings Per Share Dilutive Securities, Effect on Basic Earnings per Share (Details) (Stock Options, Restricted Stock Units And Warrants [Member])
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Stock Options, Restricted Stock Units And Warrants [Member]
    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Stock Awards Included in Computation of Earnings Per Share, Amount 4lvlt_StockAwardsIncludedinComputationofEarningsPerShareAmount
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