Fair Value Disclosures - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Millions		Mar. 31, 2024	Dec. 31, 2023
Assets
Trading assets		$ 5,268	$ 4,332
AFS securities at fair value		66,050	67,366
Loans Held for Sale, Fair Value		1,201	852
Loans and leases		14	15
Loan servicing rights at fair value		$ 3,417	3,378
Net amount		Other assets (including $1,359 and $1,311 at fair value, respectively)
Derivative Asset, Net		$ 1,088	951
Derivative Asset, Gross		3,397	2,828
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		(2,309)	(1,877)
Equity securities		271	360
Total assets		77,309	77,254
Liabilities
Interest-Bearing Domestic Deposit, Brokered		23	0
Financial Instruments Sold, Not yet Purchased, at Fair Value		2,034	1,625
Derivative liabilities		2,990	2,597
Derivative Liability, Gross		5,580	4,682
Amount Offset		2,590	2,085
Total liabilities		$ 5,047	4,222
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Other Liabilities
Liabilities of discontinued operations		$ 3,122	3,539
Level 1
Assets
Trading assets		619	461
AFS securities at fair value		0	0
Loans Held for Sale, Fair Value		0	0
Loans and leases		0	0
Loan servicing rights at fair value		0	0
Derivative Asset, Gross		1,535	956
Equity securities		264	245
Total assets		2,418	1,662
Liabilities
Financial Instruments Sold, Not yet Purchased, at Fair Value		110	185
Derivative Liability, Gross		826	487
Total liabilities		936	672
Level 2
Assets
Trading assets		4,649	3,871
AFS securities at fair value		66,050	67,366
Loans Held for Sale, Fair Value		1,201	852
Loans and leases		0	0
Loan servicing rights at fair value		0	0
Derivative Asset, Gross		1,858	1,867
Equity securities		7	115
Total assets		73,765	74,071
Liabilities
Interest-Bearing Domestic Deposit, Brokered		23
Financial Instruments Sold, Not yet Purchased, at Fair Value		1,924	1,440
Derivative Liability, Gross		4,729	4,171
Total liabilities		6,676	5,611
Level 3
Assets
Trading assets		0	0
AFS securities at fair value		0	0
Loans Held for Sale, Fair Value		0	0
Loans and leases		14	15
Loan servicing rights at fair value		3,417	3,378
Derivative Asset, Gross		4	5
Equity securities		0	0
Total assets		3,435	3,398
Liabilities
Interest-Bearing Domestic Deposit, Brokered		0
Financial Instruments Sold, Not yet Purchased, at Fair Value		0	0
Derivative Liability, Gross		25	24
Total liabilities		25	24
U.S. Treasury
Assets
Trading assets		143	144
AFS securities at fair value		9,020	10,041
U.S. Treasury | Level 1
Assets
Trading assets		0	0
AFS securities at fair value		0	0
U.S. Treasury | Level 2
Assets
Trading assets		143	144
AFS securities at fair value		9,020	10,041
U.S. Treasury | Level 3
Assets
Trading assets		0	0
AFS securities at fair value		0	0
GSE
Assets
Trading assets		42	50
AFS securities at fair value		350	362
GSE | Level 1
Assets
Trading assets		0	0
AFS securities at fair value		0	0
GSE | Level 2
Assets
Trading assets		42	50
AFS securities at fair value		350	362
GSE | Level 3
Assets
Trading assets		0	0
AFS securities at fair value		0	0
Agency MBS – residential
Assets
AFS securities at fair value		51,150	51,289
Agency MBS – residential | Level 1
Assets
AFS securities at fair value		0	0
Agency MBS – residential | Level 2
Assets
AFS securities at fair value		51,150	51,289
Agency MBS – residential | Level 3
Assets
AFS securities at fair value		0	0
Agency MBS – commercial
Assets
AFS securities at fair value		2,208	2,248
Agency MBS – commercial | Level 1
Assets
AFS securities at fair value		0	0
Agency MBS – commercial | Level 2
Assets
AFS securities at fair value		2,208	2,248
Agency MBS – commercial | Level 3
Assets
AFS securities at fair value		0	0
States and political subdivisions
Assets
Trading assets		761	760
AFS securities at fair value		419	425
States and political subdivisions | Level 1
Assets
Trading assets		0	0
AFS securities at fair value		0	0
States and political subdivisions | Level 2
Assets
Trading assets		761	760
AFS securities at fair value		419	425
States and political subdivisions | Level 3
Assets
Trading assets		0	0
AFS securities at fair value		0	0
Corporate and other debt securities
Assets
Trading assets		1,940	1,293
Corporate and other debt securities | Level 1
Assets
Trading assets		0	0
Corporate and other debt securities | Level 2
Assets
Trading assets		1,940	1,293
Corporate and other debt securities | Level 3
Assets
Trading assets		0	0
Loans
Assets
Trading assets		1,692	1,575
Loans | Level 1
Assets
Trading assets		0	0
Loans | Level 2
Assets
Trading assets		1,692	1,575
Loans | Level 3
Assets
Trading assets		0	0
Non-agency MBS
Assets
AFS securities at fair value		2,884	2,981
Non-agency MBS | Level 1
Assets
AFS securities at fair value		0	0
Non-agency MBS | Level 2
Assets
AFS securities at fair value		2,884	2,981
Other
Assets
Trading assets		690	510
AFS securities at fair value		19	20
Other | Level 1
Assets
Trading assets		619	461
AFS securities at fair value		0	0
Other | Level 2
Assets
Trading assets		71	49
AFS securities at fair value		19	20
Other | Level 3
Assets
Trading assets		0	0
AFS securities at fair value		0	0
Fair Value, Concentration of Credit Risk, Master Netting Arrangements
Assets
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[1]	(2,309)	(1,877)
Liabilities
Amount Offset	[1]	$ (2,590)	$ (2,085)

[1] Refer to “Note 16. Derivative Financial Instruments” for additional discussion on netting adjustments.