Revenue from Contracts with Customers, Revenue by Operating Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest Income	$ 9,221	$ 8,808
Lending-related fees	342	361
Other card fees	127	115
Total card fees	1,029	949
Mortgage banking	693	1,326
Net gains (losses) from trading activities	218	348
Net gains (losses) from equity securities	576	392
Lease income	327	315
Other	229	667
Total noninterest income	8,371	9,724
Total revenue	17,592	18,532
Debt securities [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net gains (losses) from debt securities	2	151
Deposit-related fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	1,473	1,255
Investment advisory and other asset-based fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	2,498	2,756
Trailing commissions [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	271	298
Commissions and brokerage services fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	537	636
Investment banking fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	447	568
Card interchange and network revenues [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	902	834
Credit card rewards and rebates [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Other cost of revenue	482	310
Corporate [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest Income	(818)	(390)
Lending-related fees	0	0
Other card fees	0	1
Total card fees	0	1
Mortgage banking	0	0
Net gains (losses) from trading activities	(11)	8
Net gains (losses) from equity securities	504	270
Lease income	146	140
Other	186	469
Total noninterest income	806	1,417
Total revenue	(12)	1,027
Corporate [Member] | Debt securities [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net gains (losses) from debt securities	2	151
Corporate [Member] | Deposit-related fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	4
Corporate [Member] | Investment advisory and other asset-based fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	8	423
Corporate [Member] | Commissions and brokerage services fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	0
Corporate [Member] | Investment banking fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	(29)	(49)
Corporate [Member] | Card interchange and network revenues [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	0
Reconciling Items [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest Income	(107)	(107)
Lending-related fees	0	0
Other card fees	0	0
Total card fees	0	0
Mortgage banking	0	0
Net gains (losses) from trading activities	0	0
Net gains (losses) from equity securities	0	0
Lease income	0	0
Other	(406)	(271)
Total noninterest income	(406)	(271)
Total revenue	(513)	(378)
Reconciling Items [Member] | Debt securities [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net gains (losses) from debt securities	0	0
Reconciling Items [Member] | Deposit-related fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	0
Reconciling Items [Member] | Investment advisory and other asset-based fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	0
Reconciling Items [Member] | Commissions and brokerage services fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	0
Reconciling Items [Member] | Investment banking fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	0
Reconciling Items [Member] | Card interchange and network revenues [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	0
Consumer Banking and Lending [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest Income	5,996	5,615
Lending-related fees	34	40
Other card fees	127	114
Total card fees	961	892
Mortgage banking	654	1,259
Net gains (losses) from trading activities	0	1
Net gains (losses) from equity securities	(9)	34
Lease income	0	0
Other	83	158
Total noninterest income	2,567	3,039
Total revenue	8,563	8,654
Consumer Banking and Lending [Member] | Operating Segments [Member] | Debt securities [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net gains (losses) from debt securities	0	0
Consumer Banking and Lending [Member] | Operating Segments [Member] | Deposit-related fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	845	661
Consumer Banking and Lending [Member] | Operating Segments [Member] | Investment advisory and other asset-based fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	0
Consumer Banking and Lending [Member] | Operating Segments [Member] | Commissions and brokerage services fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	0
Consumer Banking and Lending [Member] | Operating Segments [Member] | Investment banking fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	(1)	(6)
Consumer Banking and Lending [Member] | Operating Segments [Member] | Card interchange and network revenues [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	834	778
Commercial Banking [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest Income	1,361	1,254
Lending-related fees	121	136
Other card fees	0	0
Total card fees	53	45
Mortgage banking	0	0
Net gains (losses) from trading activities	0	2
Net gains (losses) from equity securities	86	13
Lease income	179	174
Other	182	122
Total noninterest income	966	827
Total revenue	2,327	2,081
Commercial Banking [Member] | Operating Segments [Member] | Debt securities [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net gains (losses) from debt securities	0	0
Commercial Banking [Member] | Operating Segments [Member] | Deposit-related fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	328	317
Commercial Banking [Member] | Operating Segments [Member] | Investment advisory and other asset-based fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	2	5
Commercial Banking [Member] | Operating Segments [Member] | Commissions and brokerage services fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	0
Commercial Banking [Member] | Operating Segments [Member] | Investment banking fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	15	13
Commercial Banking [Member] | Operating Segments [Member] | Card interchange and network revenues [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	53	45
Corporate and Investment Banking [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest Income	1,990	1,779
Lending-related fees	185	183
Other card fees	0	0
Total card fees	14	10
Mortgage banking	42	70
Net gains (losses) from trading activities	228	331
Net gains (losses) from equity securities	(5)	75
Lease income	2	1
Other	164	175
Total noninterest income	1,480	1,825
Total revenue	3,470	3,604
Corporate and Investment Banking [Member] | Operating Segments [Member] | Debt securities [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net gains (losses) from debt securities	0	0
Corporate and Investment Banking [Member] | Operating Segments [Member] | Deposit-related fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	293	266
Corporate and Investment Banking [Member] | Operating Segments [Member] | Investment advisory and other asset-based fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	12	22
Corporate and Investment Banking [Member] | Operating Segments [Member] | Commissions and brokerage services fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	83	81
Corporate and Investment Banking [Member] | Operating Segments [Member] | Investment banking fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	462	611
Corporate and Investment Banking [Member] | Operating Segments [Member] | Card interchange and network revenues [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	14	10
Wealth and Investment Management [Member] | Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net interest Income	799	657
Lending-related fees	2	2
Other card fees	0	0
Total card fees	1	1
Mortgage banking	(3)	(3)
Net gains (losses) from trading activities	1	6
Net gains (losses) from equity securities	0	0
Lease income	0	0
Other	20	14
Total noninterest income	2,958	2,887
Total revenue	3,757	3,544
Wealth and Investment Management [Member] | Operating Segments [Member] | Debt securities [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net gains (losses) from debt securities	0	0
Wealth and Investment Management [Member] | Operating Segments [Member] | Deposit-related fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	7	7
Wealth and Investment Management [Member] | Operating Segments [Member] | Investment advisory and other asset-based fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	2,476	2,306
Wealth and Investment Management [Member] | Operating Segments [Member] | Commissions and brokerage services fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	454	555
Wealth and Investment Management [Member] | Operating Segments [Member] | Investment banking fees [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	0	(1)
Wealth and Investment Management [Member] | Operating Segments [Member] | Card interchange and network revenues [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Fee income	$ 1	$ 1