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

Represents the health care benefit expenses for the active employees health care plan.

No definition available.

Name:	ctq_HealthCareBenefitExpense
Namespace Prefix:	ctq_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration