Fair Value Measurements - Assets and Liabilities Recorded at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Netting, Assets		$ (11,991)	$ (25,537)
Netting Liabilities		(11,991)	(25,537)
Trading assets	[1]	24,043	27,284
Trading liabilities	[1]	3,023	5,397
Debt securities issued by foreign entities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets		167	7,971
Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets		15,795	6,043
Precious metals trading
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets		3,907	4,989
Trading liabilities		46	2,312
Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading liabilities		1,874	2,358
Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Trading assets		1,405	2,801
Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		74,511	97,982
Netting, Assets		(14,788)	(29,616)
Net Balance, Assets		59,723	68,366
Gross Balance, Liabilities		28,125	49,380
Netting Liabilities		(13,287)	(28,914)
Net Balance, Liabilities		14,838	20,466
Fair Value, Recurring | Domestic Deposits | Domestic Deposits
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		2,749	4,155
Net Balance, Liabilities		2,749	4,155
Fair Value, Recurring | Trading liabilities, excluding derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		1,149	3,039
Net Balance, Liabilities		1,149	3,039
Fair Value, Recurring | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		15,285	31,461
Netting Liabilities		(13,287)	(28,914)
Net Balance, Liabilities		1,998	2,547
Fair Value, Recurring | Derivatives | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		1,899	6,625
Netting Liabilities		0	0
Net Balance, Liabilities		1,899	6,625
Fair Value, Recurring | Derivatives | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		11,126	18,603
Netting Liabilities		0	0
Net Balance, Liabilities		11,126	18,603
Fair Value, Recurring | Derivatives | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		1,361	4,291
Netting Liabilities		0	0
Net Balance, Liabilities		1,361	4,291
Fair Value, Recurring | Derivatives | Precious metals contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		779	1,578
Netting Liabilities		0	0
Net Balance, Liabilities		779	1,578
Fair Value, Recurring | Derivatives | Credit contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		82	297
Netting Liabilities		0	0
Net Balance, Liabilities		82	297
Fair Value, Recurring | Derivatives | Other Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		38	67
Netting Liabilities		0	0
Net Balance, Liabilities		38	67
Fair Value, Recurring | Derivatives | Derivatives netting
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Netting Liabilities		(13,287)	(28,914)
Net Balance, Liabilities		(13,287)	(28,914)
Fair Value, Recurring | Long-term debt | Fixed rate long-term debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		8,942	10,725
Net Balance, Liabilities		8,942	10,725
Fair Value, Recurring | Trading assets, excluding derivatives: | U.S. Treasury, U.S. Government agencies and sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		2,769	5,337
Net Balance, Assets		2,769	5,337
Fair Value, Recurring | Trading assets, excluding derivatives: | Debt securities issued by foreign entities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		167	7,971
Net Balance, Assets		167	7,971
Fair Value, Recurring | Trading assets, excluding derivatives: | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		15,795	6,043
Net Balance, Assets		15,795	6,043
Fair Value, Recurring | Trading assets, excluding derivatives: | Precious metals trading
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		3,907	4,989
Net Balance, Assets		3,907	4,989
Fair Value, Recurring | Trading assets, excluding derivatives: | Collateralized debt obligations
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets			63
Net Balance, Assets			63
Fair Value, Recurring | Trading assets, excluding derivatives: | Residential mortgages
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets			15
Net Balance, Assets			15
Fair Value, Recurring | Trading assets, excluding derivatives: | Student loans
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets			65
Net Balance, Assets			65
Fair Value, Recurring | Derivative
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		16,229	32,468
Netting, Assets		(14,788)	(29,616)
Net Balance, Assets		1,441	2,852
Fair Value, Recurring | Derivative | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		1,848	6,687
Netting, Assets		0	0
Net Balance, Assets		1,848	6,687
Fair Value, Recurring | Derivative | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		11,350	18,467
Netting, Assets		0	0
Net Balance, Assets		11,350	18,467
Fair Value, Recurring | Derivative | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		2,058	5,616
Netting, Assets		0	0
Net Balance, Assets		2,058	5,616
Fair Value, Recurring | Derivative | Precious metals contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		940	1,323
Netting, Assets		0	0
Net Balance, Assets		940	1,323
Fair Value, Recurring | Derivative | Credit contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		28	367
Netting, Assets		0	0
Net Balance, Assets		28	367
Fair Value, Recurring | Derivative | Other Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		5	8
Netting, Assets		0	0
Net Balance, Assets		5	8
Fair Value, Recurring | Derivative | Derivatives netting
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Netting, Assets		(14,788)	(29,616)
Net Balance, Assets		(14,788)	(29,616)
Fair Value, Recurring | Securities available-for-sale ("AFS") | U.S. Treasury, U.S. Government agencies and sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		32,866	35,408
Net Balance, Assets		32,866	35,408
Fair Value, Recurring | Securities available-for-sale ("AFS") | Debt securities issued by foreign entities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		2,312	5,133
Net Balance, Assets		2,312	5,133
Fair Value, Recurring | Securities available-for-sale ("AFS") | Home equity
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		19	27
Net Balance, Assets		19	27
Fair Value, Recurring | Securities available-for-sale ("AFS") | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		101	104
Net Balance, Assets		101	104
Fair Value, Recurring | Loans | Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		48	36
Net Balance, Assets		48	36
Fair Value, Recurring | Loans | Loans
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets			32
Net Balance, Assets			32
Fair Value, Recurring | Other assets: | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		144	149
Net Balance, Assets		144	149
Fair Value, Recurring | Other assets: | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		16	7
Net Balance, Assets		16	7
Fair Value, Recurring | Other assets: | Equity securities measured at net asset value
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		138	135
Net Balance, Assets		138	135
Fair Value, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		31,296	43,978
Gross Balance, Liabilities		1,113	764
Fair Value, Recurring | Level 1 | Domestic Deposits | Domestic Deposits
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 1 | Trading liabilities, excluding derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		1,103	727
Fair Value, Recurring | Level 1 | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		10	37
Fair Value, Recurring | Level 1 | Derivatives | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		10	9
Fair Value, Recurring | Level 1 | Derivatives | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 1 | Derivatives | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 1 | Derivatives | Precious metals contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	28
Fair Value, Recurring | Level 1 | Derivatives | Credit contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 1 | Derivatives | Other Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 1 | Derivatives | Derivatives netting
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 1 | Long-term debt | Fixed rate long-term debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 1 | Trading assets, excluding derivatives: | U.S. Treasury, U.S. Government agencies and sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		2,337	5,145
Fair Value, Recurring | Level 1 | Trading assets, excluding derivatives: | Debt securities issued by foreign entities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		134	7,953
Fair Value, Recurring | Level 1 | Trading assets, excluding derivatives: | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		15,795	6,043
Fair Value, Recurring | Level 1 | Trading assets, excluding derivatives: | Precious metals trading
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 1 | Trading assets, excluding derivatives: | Collateralized debt obligations
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets			0
Fair Value, Recurring | Level 1 | Trading assets, excluding derivatives: | Residential mortgages
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets			0
Fair Value, Recurring | Level 1 | Trading assets, excluding derivatives: | Student loans
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets			0
Fair Value, Recurring | Level 1 | Derivative
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		12	15
Fair Value, Recurring | Level 1 | Derivative | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		8	15
Fair Value, Recurring | Level 1 | Derivative | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 1 | Derivative | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 1 | Derivative | Precious metals contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		4	0
Fair Value, Recurring | Level 1 | Derivative | Credit contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 1 | Derivative | Other Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 1 | Derivative | Derivatives netting
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 1 | Securities available-for-sale ("AFS") | U.S. Treasury, U.S. Government agencies and sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		10,817	22,880
Fair Value, Recurring | Level 1 | Securities available-for-sale ("AFS") | Debt securities issued by foreign entities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		2,201	1,942
Fair Value, Recurring | Level 1 | Securities available-for-sale ("AFS") | Home equity
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 1 | Securities available-for-sale ("AFS") | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 1 | Loans | Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 1 | Loans | Loans
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets			0
Fair Value, Recurring | Level 1 | Other assets: | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 1 | Other assets: | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 1 | Other assets: | Equity securities measured at net asset value
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		42,722	53,024
Gross Balance, Liabilities		24,414	46,996
Fair Value, Recurring | Level 2 | Domestic Deposits | Domestic Deposits
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		2,214	3,509
Fair Value, Recurring | Level 2 | Trading liabilities, excluding derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		46	2,312
Fair Value, Recurring | Level 2 | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		15,065	30,898
Fair Value, Recurring | Level 2 | Derivatives | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		1,888	6,615
Fair Value, Recurring | Level 2 | Derivatives | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		11,124	18,597
Fair Value, Recurring | Level 2 | Derivatives | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		1,194	3,845
Fair Value, Recurring | Level 2 | Derivatives | Precious metals contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		779	1,550
Fair Value, Recurring | Level 2 | Derivatives | Credit contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		80	291
Fair Value, Recurring | Level 2 | Derivatives | Other Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 2 | Derivatives | Derivatives netting
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 2 | Long-term debt | Fixed rate long-term debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		7,089	10,277
Fair Value, Recurring | Level 2 | Trading assets, excluding derivatives: | U.S. Treasury, U.S. Government agencies and sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		432	192
Fair Value, Recurring | Level 2 | Trading assets, excluding derivatives: | Debt securities issued by foreign entities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		33	18
Fair Value, Recurring | Level 2 | Trading assets, excluding derivatives: | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 2 | Trading assets, excluding derivatives: | Precious metals trading
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		3,907	4,989
Fair Value, Recurring | Level 2 | Trading assets, excluding derivatives: | Collateralized debt obligations
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets			63
Fair Value, Recurring | Level 2 | Trading assets, excluding derivatives: | Residential mortgages
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets			0
Fair Value, Recurring | Level 2 | Trading assets, excluding derivatives: | Student loans
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets			65
Fair Value, Recurring | Level 2 | Derivative
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		15,998	31,761
Fair Value, Recurring | Level 2 | Derivative | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		1,839	6,637
Fair Value, Recurring | Level 2 | Derivative | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		11,350	18,452
Fair Value, Recurring | Level 2 | Derivative | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		1,845	5,051
Fair Value, Recurring | Level 2 | Derivative | Precious metals contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		936	1,323
Fair Value, Recurring | Level 2 | Derivative | Credit contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		28	298
Fair Value, Recurring | Level 2 | Derivative | Other Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 2 | Derivative | Derivatives netting
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 2 | Securities available-for-sale ("AFS") | U.S. Treasury, U.S. Government agencies and sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		22,049	12,528
Fair Value, Recurring | Level 2 | Securities available-for-sale ("AFS") | Debt securities issued by foreign entities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		111	3,191
Fair Value, Recurring | Level 2 | Securities available-for-sale ("AFS") | Home equity
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 2 | Securities available-for-sale ("AFS") | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 2 | Loans | Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		48	36
Fair Value, Recurring | Level 2 | Loans | Loans
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets			32
Fair Value, Recurring | Level 2 | Other assets: | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		144	149
Fair Value, Recurring | Level 2 | Other assets: | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 2 | Other assets: | Equity securities measured at net asset value
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		355	845
Gross Balance, Liabilities		2,598	1,620
Fair Value, Recurring | Level 3 | Domestic Deposits | Domestic Deposits
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		535	646
Fair Value, Recurring | Level 3 | Trading liabilities, excluding derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 3 | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		210	526
Fair Value, Recurring | Level 3 | Derivatives | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		1	1
Fair Value, Recurring | Level 3 | Derivatives | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		2	6
Fair Value, Recurring | Level 3 | Derivatives | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		167	446
Fair Value, Recurring | Level 3 | Derivatives | Precious metals contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 3 | Derivatives | Credit contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		2	6
Fair Value, Recurring | Level 3 | Derivatives | Other Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		38	67
Fair Value, Recurring | Level 3 | Derivatives | Derivatives netting
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		0	0
Fair Value, Recurring | Level 3 | Long-term debt | Fixed rate long-term debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Liabilities		1,853	448
Fair Value, Recurring | Level 3 | Trading assets, excluding derivatives: | U.S. Treasury, U.S. Government agencies and sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 3 | Trading assets, excluding derivatives: | Debt securities issued by foreign entities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 3 | Trading assets, excluding derivatives: | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 3 | Trading assets, excluding derivatives: | Precious metals trading
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 3 | Trading assets, excluding derivatives: | Collateralized debt obligations
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets			0
Fair Value, Recurring | Level 3 | Trading assets, excluding derivatives: | Residential mortgages
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets			15
Fair Value, Recurring | Level 3 | Trading assets, excluding derivatives: | Student loans
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets			0
Fair Value, Recurring | Level 3 | Derivative
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		219	692
Fair Value, Recurring | Level 3 | Derivative | Interest rate contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		1	35
Fair Value, Recurring | Level 3 | Derivative | Foreign exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	15
Fair Value, Recurring | Level 3 | Derivative | Equity contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		213	565
Fair Value, Recurring | Level 3 | Derivative | Precious metals contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 3 | Derivative | Credit contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	69
Fair Value, Recurring | Level 3 | Derivative | Other Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		5	8
Fair Value, Recurring | Level 3 | Derivative | Derivatives netting
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 3 | Securities available-for-sale ("AFS") | U.S. Treasury, U.S. Government agencies and sponsored enterprises
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 3 | Securities available-for-sale ("AFS") | Debt securities issued by foreign entities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 3 | Securities available-for-sale ("AFS") | Home equity
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		19	27
Fair Value, Recurring | Level 3 | Securities available-for-sale ("AFS") | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		101	104
Fair Value, Recurring | Level 3 | Loans | Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 3 | Loans | Loans
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets			0
Fair Value, Recurring | Level 3 | Other assets: | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		0	0
Fair Value, Recurring | Level 3 | Other assets: | Mortgage servicing rights
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		16	7
Fair Value, Recurring | Level 3 | Other assets: | Equity securities measured at net asset value
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Gross Balance, Assets		$ 0	$ 0

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at December 31, 2021 and 2020. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 27, "Variable Interest Entities," for additional information. At December 31,20212020(in millions)AssetsLoans$46 $10 Other assets55 79 Total assets$101 $89 LiabilitiesInterest, taxes and other liabilities$9 $10 Total liabilities$9 $10