Acquisitions, Goodwill and Other Intangible Assets (Changes in Goodwill Balances) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($)
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 11,456	[1]
Acquisitions	729
Dispositions, currency exchange and other	(724)
Goodwill, period increase (decrease)	4
Goodwill, Ending Balance	11,460	[1]
CLL
Goodwill [Roll Forward]
Goodwill, Beginning Balance	25
Acquisitions	0
Dispositions, currency exchange and other	86
Goodwill, Ending Balance	111
Consumer
Goodwill [Roll Forward]
Goodwill, Beginning Balance	9,777
Acquisitions	0
Dispositions, currency exchange and other	(689)
Goodwill, Ending Balance	9,088
Energy Financial Services
Goodwill [Roll Forward]
Goodwill, Beginning Balance	1,507
Acquisitions	0
Dispositions, currency exchange and other	(121)
Goodwill, Ending Balance	1,386
GECAS
Goodwill [Roll Forward]
Goodwill, Beginning Balance	147
Acquisitions	729
Dispositions, currency exchange and other	0
Goodwill, Ending Balance	$ 876

[1] Amounts may not add due to rounding.