Financing Receivables and Allowance for Losses (Portfolio) (Details) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable [Line Items]
Financing receivables, net of deferred income		$ 87,204	$ 126,561
Allowance for losses		(3,457)	(4,104)	$ (4,231)	$ (4,025)
Financing Receivable, Net	[1]	83,748	122,457
CLL [Member]
Financing Receivable [Line Items]
Financing receivables, net of deferred income		13,341	14,418
Allowance for losses		(32)	(21)	(20)	(17)
Energy Financial Services [Member]
Financing Receivable [Line Items]
Financing receivables, net of deferred income		2,443	2,580
Allowance for losses		(14)	(26)	(6)	(8)
GECAS [Member]
Financing Receivable [Line Items]
Financing receivables, net of deferred income		7,394	8,263
Allowance for losses		(37)	(46)	(15)	(17)
Other Commercial [Member]
Financing Receivable [Line Items]
Financing receivables, net of deferred income		506	480
Allowance for losses		(2)	0	$ 0	$ (2)
Consumer Portfolio Segment [Member]
Financing Receivable [Line Items]
Financing receivables, net of deferred income		63,520	100,820
Commercial [Member]
Financing Receivable [Line Items]
Financing receivables, net of deferred income		$ 23,684	$ 25,741

[1] Amounts may not add due to rounding.