Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Amortized intangible assets:
Gross carrying value	$ 19,063	$ 18,919
Accumulated amortization	(14,008)	(13,259)
Net carrying value	5,055	5,660
Unamortized intangible assets:
Mortgage servicing rights	12,661	12,738
Goodwill	25,705	25,705	$ 25,705	$ 25,637
Trademark	14	14
MSRs [Member]
Amortized intangible assets:
Gross carrying value	3,050	2,906
Accumulated amortization	(1,788)	(1,664)
Net carrying value	1,262	1,242
Core deposit intangibles [Member]
Amortized intangible assets:
Gross carrying value	12,834	12,834
Accumulated amortization	(9,784)	(9,273)
Net carrying value	3,050	3,561
Customer relationship and other intangibles [Member]
Amortized intangible assets:
Gross carrying value	3,179	3,179
Accumulated amortization	(2,436)	(2,322)
Net carrying value	$ 743	$ 857