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Goodwill and Other Intangible Assets (Goodwill) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Goodwill [Line Items]    
Goodwill, Period Increase (Decrease) $ 4,850us-gaap_GoodwillPeriodIncreaseDecrease  
Total CLL [Member]    
Goodwill [Line Items]    
Implied Fair Value Of Goodwill Exceeding Carrying Value Of Goodwill   4,457us-gaap_ReportingUnitAmountOfFairValueInExcessOfCarryingAmount
/ us-gaap_StatementBusinessSegmentsAxis
= gecc_CllMember
Consumer [Member] | ANZ Consumer Lending [Member]    
Goodwill [Line Items]    
Implied Fair Value Of Goodwill Exceeding Carrying Value Of Goodwill $ 410us-gaap_ReportingUnitAmountOfFairValueInExcessOfCarryingAmount
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= gecc_AnzConsumerLendingMember
/ us-gaap_StatementBusinessSegmentsAxis
= gecc_ConsumerMember