Goodwill and Intangible Assets - Goodwill Attributable to Each Business Segments (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 13,978	$ 13,978
Goodwill, Acquired During Period	508	12
Other adjustments	(6)	(12)
Goodwill, Ending Balance	14,480	13,978
Credit Card
Goodwill [Roll Forward]
Goodwill, Beginning Balance	5,001	5,005
Goodwill, Acquired During Period	1	2
Other adjustments	(5)	(6)
Goodwill, Ending Balance	4,997	5,001
Consumer Banking
Goodwill [Roll Forward]
Goodwill, Beginning Balance	4,593	4,585
Goodwill, Acquired During Period	7	10
Other adjustments	0	(2)
Goodwill, Ending Balance	4,600	4,593
Commercial Banking
Goodwill [Roll Forward]
Goodwill, Beginning Balance	4,384	4,388
Goodwill, Acquired During Period	500	0
Other adjustments	(1)	(4)
Goodwill, Ending Balance	4,883	$ 4,384
GE Healthcare [Member]
Goodwill [Roll Forward]
Goodwill, Acquired During Period	$ 500