Other Assets (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Components of Other Assets [Line Items]
Cost method investments		$ 7,607		$ 7,607		$ 8,397
Equity method investments		15,823		15,823		15,708
Other assets, carried at fair value		3,986		3,986		3,275
Total nonmarketable equity investments		27,416		27,416		27,380
Corporate/bank-owned life insurance		19,430		19,430		19,325
Accounts receivable (3)		41,853		41,853		31,056
Interest receivable		5,401		5,401		5,339
Customer relationship and other amortized intangibles		3,532		3,532		4,115
Non-residential real estate		347		347		403
Operating lease assets		9,713		9,713		10,089
Due from customers on acceptances		192		192		196
Other		12,047		12,047		17,469
Other assets	[1]	118,966		118,966		114,541
Other Assets Textual [Abstract]
Income (loss) from affordable housing projects, equity method investments		227	$ 199	457	$ 401
Low income housing tax credit (LIHTC) investment total tax benefits		347	304	694	611
Low income housing tax credit (LIHTC) investment tax credits		260	230	521	460
Low income housing tax credit (LIHTC) investment liability for unfunded commitments		3,300		$ 3,300		3,600
Low income housing tax credit (LIHTC) investment, year liability is expected to be paid				3 years
Income (Expense) Related to Nonmarketable Equity Investments [Abstract]
Net realized gains from nonmarketable equity investments		87	129	$ 374	314
All other		(195)	(135)	(240)	(321)
Total		(108)	$ (6)	134	$ (7)
Government insured/guaranteed [Member]
Components of Other Assets [Line Items]
Residential real estate		149		149		197
Non-government insured/guaranteed [Member]
Components of Other Assets [Line Items]
Residential real estate		285		285		378
Core deposit intangibles [Member]
Components of Other Assets [Line Items]
Customer relationship and other amortized intangibles		1,193		1,193		1,620
Customer relationship and other amortized intangibles [Member]
Components of Other Assets [Line Items]
Customer relationship and other amortized intangibles		940		940		1,089
Auction rate securities [Member]
Components of Other Assets [Line Items]
Cost method investments		420		420		525
Federal bank stock [Member]
Components of Other Assets [Line Items]
Cost method investments		5,820		5,820		6,407
Low Income Housing Tax Credit Equity Method Investments [Member]
Components of Other Assets [Line Items]
Equity method investments		9,828		9,828		9,714
Private equity and other [Member]
Components of Other Assets [Line Items]
Cost method investments		1,367		1,367		1,465
Equity method investments		3,740		3,740		3,635
Tax Advantaged Renewable Energy [Member]
Components of Other Assets [Line Items]
Equity method investments		1,960		1,960		2,054
New Market Tax Credit and Other [Member]
Components of Other Assets [Line Items]
Equity method investments		$ 295		$ 295		$ 305

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