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Employee Benefits (Details 2) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Health Care and Life Insurance [Abstract] |  |  |
Health care benefit expenses | $ 217 | $ 204 | $ 223

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | ctq_HealthCareAndLifeInsuranceAbstract
Namespace Prefix: | ctq_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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