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Employee Benefits (Details 2) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2011 Predecessor
Health Care and Life Insurance |  |  |  |
Health care benefit expenses | $ 167 | $ 223 | $ 221 | $ 57

X
- Details
Name: | ctq_HealthCareAndLifeInsuranceAbstract
Namespace Prefix: | ctq_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the health care benefit expenses for the active employees health care plan. + References No definition available. + Details
Name: | ctq_HealthCareBenefitExpense
Namespace Prefix: | ctq_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration