Name:	CT_AdditionsDueToChangeInExpectedCashFlows
Namespace Prefix:	CT_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The aggregate amount of amortization of other than temporary impairments.

No definition available.

Name:	CT_AmortizationOfOtherThanTemporaryImpairments
Namespace Prefix:	CT_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The value of asset in deconsolidation of a subsidiary or derecognition of a group of assets.

No definition available.

Name:	CT_DeconsolidationOfCtLegacyAsset
Namespace Prefix:	CT_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The reduction in other than temporary impairment due to realized losses.

No definition available.

Name:	CT_ReductionsDueToRealizedLosses
Namespace Prefix:	CT_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Total other than temporary impairments (OTTI) either recognized in accumulated other comprehensive loss or earnings. The amount represented by this item is net of tax, as applicable.

No definition available.

Name:	CT_TotalOtherThanTemporaryImpairment
Namespace Prefix:	CT_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Total of accumulated other comprehensive loss related to that portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized either as available-for-sale or held-to-maturity that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 16C

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14A

-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 7

-Footnote 2

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 19

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxDebtSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

A valuation allowance for financing receivables that are expected to be uncollectible.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524