Shareowners' Equity (Changes Noncontrolling Interests) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Synchrony Financial	$ 2,617		$ 2,531
AOCI and other	$ 1	$ 3

This element represents Other Comprehensive Income or Loss, Net of Tax, for the period attributable to noncontrolling interest. Includes deferred gains or losses on qualifying hedges, unrealized holding gains or losses on available-for-sale securities, minimum pension liability, and cumulative translation adjustment in addition to various other transactions related to noncontrolling interests

No definition available.

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Namespace Prefix:	gecc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration