Other Assets (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2015		Jun. 30, 2014	Jun. 30, 2015		Jun. 30, 2014	Dec. 31, 2014
Components of Other Assets [Line Items]
Cost method investments	$ 6,861			$ 6,861			$ 7,033
Equity method investments	12,798			12,798			12,410
Other assets, carried at fair value	2,636			2,636			2,512
Total nonmarketable equity investments	22,295			22,295			21,955
Corporate/bank-owned life insurance	19,109			19,109			18,982
Accounts receivable (4)	23,943			23,943			27,151
Interest receivable	5,059			5,059			4,871
Customer relationship and other amortized intangibles	5,055			5,055			5,660
Non-residential real estate	794			794			956
Operating lease assets	3,309			3,309			2,714
Due from customers on acceptances	220			220			201
Other	16,899			16,899			16,156
Other assets	96,585	[1]		96,585	[1]		99,057
Income (Expense) Related to Nonmarketable Equity Investments [Abstract]
Net realized gains from nonmarketable equity investments	479		$ 381	830		$ 932
All other	(278)		(209)	(426)		(432)
Total	201		$ 172	404		$ 500
Government insured/guaranteed [Member]
Components of Other Assets [Line Items]
Residential real estate	588			588			982
Non-government insured/guaranteed [Member]
Components of Other Assets [Line Items]
Residential real estate	576			576			671
Core deposit intangibles [Member]
Components of Other Assets [Line Items]
Customer relationship and other amortized intangibles	3,050			3,050			3,561
Customer relationship and other amortized intangibles [Member]
Components of Other Assets [Line Items]
Customer relationship and other amortized intangibles	743			743			857
Federal bank stock [Member]
Components of Other Assets [Line Items]
Cost method investments	4,400			4,400			4,733
Low Income Housing Tax Credit Equity Method Investments [Member]
Components of Other Assets [Line Items]
Equity method investments	7,887			7,887			7,278
Private equity and other [Member]
Components of Other Assets [Line Items]
Cost method investments	2,461			2,461			2,300
Equity method investments	$ 4,911			$ 4,911			$ 5,132

[1] Parenthetical amounts represent assets and liabilities for which we have elected the fair value option.