v2.4.1.9
Summary of Significant Accounting Policies (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2014
Feb. 13, 2015
Sep. 03, 2014
Aug. 05, 2014
Oct. 31, 2014
Sep. 30, 2014
Subsidiary, Sale of Stock [Line Items]            
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward 1 $ 1,009gecc_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward1          
Synchrony Financial            
Subsidiary, Sale of Stock [Line Items]            
Sale of Stock, Consideration Received on Transaction 2,842us-gaap_SaleOfStockConsiderationReceivedOnTransaction
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
         
Sale of Stock, Percentage of Ownership after Transaction 85.00%us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
         
Synchrony Financial Noncontrolling Interest 15.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
         
Proceeds from Issuance of Unsecured Debt 8,000us-gaap_ProceedsFromIssuanceOfUnsecuredDebt
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
         
Unsecured Long-term Debt, Noncurrent   $ 1,000us-gaap_UnsecuredLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
    $ 750us-gaap_UnsecuredLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
$ 3,593us-gaap_UnsecuredLongTermDebt
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
Debt Conversion, Original Debt, Due Date, Year 2019 2020        
Synchrony Financial | IPO [Member]            
Subsidiary, Sale of Stock [Line Items]            
Sale of Stock, Number of Shares Issued in Transaction     3,500,000us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
125,000,000us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
   
Sale of Stock, Price Per Share       $ 23us-gaap_SaleOfStockPricePerShare
/ dei_LegalEntityAxis
= us-gaap_SubsidiaryIssuerMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember