Fair Value Disclosures - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Millions		Jun. 30, 2023	Dec. 31, 2022
Assets
Trading assets		$ 4,097	$ 4,905
AFS securities at fair value		68,965	71,801
Loans Held for Sale, Fair Value		1,645	1,065
Loans and leases		16	18
Loan servicing rights at fair value		3,497	3,758
Derivative Asset, Net		805	684
Derivative Asset, Gross		2,728	2,453
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset		(1,923)	(1,769)
Equity securities		910	898
Total assets		79,935	83,129
Liabilities
Derivative liabilities		3,128	2,971
Derivative Liability, Gross		5,184	4,749
Amount Offset		2,056	1,778
Financial Instruments Sold, Not yet Purchased, at Fair Value		1,585	1,551
Total liabilities		4,713	4,522
Level 1
Assets
Trading assets		306	261
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		907	472
Equity securities		803	796
Total assets		2,016	1,529
Liabilities
Derivative Liability, Gross		486	364
Financial Instruments Sold, Not yet Purchased, at Fair Value		263	114
Total liabilities		749	478
Level 2
Assets
Trading assets		3,791	4,644
AFS securities at fair value		68,965	71,801
Loans Held for Sale, Fair Value		1,645	1,065
Loans and leases		0	0
Loan servicing rights at fair value		0	0
Derivative Asset, Gross		1,819	1,980
Equity securities		107	102
Total assets		76,327	79,592
Liabilities
Derivative Liability, Gross		4,665	4,348
Financial Instruments Sold, Not yet Purchased, at Fair Value		1,322	1,437
Total liabilities		5,987	5,785
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		16	18
Loan servicing rights at fair value		3,497	3,758
Derivative Asset, Gross		2	1
Equity securities		0	0
Total assets		3,515	3,777
Liabilities
Derivative Liability, Gross		33	37
Financial Instruments Sold, Not yet Purchased, at Fair Value		0	0
Total liabilities		33	37
U.S. Treasury
Assets
Trading assets		142	137
AFS securities at fair value		9,718	10,295
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		142	137
AFS securities at fair value		9,718	10,295
U.S. Treasury | Level 3
Assets
Trading assets		0	0
AFS securities at fair value		0	0
GSE
Assets
Trading assets		50	457
AFS securities at fair value		288	303
GSE | Level 1
Assets
Trading assets		0	0
AFS securities at fair value		0	0
GSE | Level 2
Assets
Trading assets		50	457
AFS securities at fair value		288	303
GSE | Level 3
Assets
Trading assets		0	0
AFS securities at fair value		0	0
Agency MBS - residential
Assets
Trading assets		0	804
AFS securities at fair value		53,195	55,225
Agency MBS - residential | Level 1
Assets
Trading assets		0	0
AFS securities at fair value		0	0
Agency MBS - residential | Level 2
Assets
Trading assets		0	804
AFS securities at fair value		53,195	55,225
Agency MBS - residential | Level 3
Assets
Trading assets		0	0
AFS securities at fair value		0	0
Agency MBS - commercial
Assets
Trading assets			62
AFS securities at fair value		2,292	2,424
Agency MBS - commercial | Level 1
Assets
Trading assets			0
AFS securities at fair value		0	0
Agency MBS - commercial | Level 2
Assets
Trading assets			62
AFS securities at fair value		2,292	2,424
Agency MBS - commercial | Level 3
Assets
Trading assets			0
AFS securities at fair value		0	0
States and political subdivisions
Assets
Trading assets		466	422
AFS securities at fair value		418	416
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		466	422
AFS securities at fair value		418	416
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		1,368	761
Corporate and other debt securities | Level 1
Assets
Trading assets		0	0
Corporate and other debt securities | Level 2
Assets
Trading assets		1,368	761
Corporate and other debt securities | Level 3
Assets
Trading assets		0	0
Loans
Assets
Trading assets		1,701	1,960
Loans | Level 1
Assets
Trading assets		0	0
Loans | Level 2
Assets
Trading assets		1,701	1,960
Loans | Level 3
Assets
Trading assets		0	0
Other
Assets
Trading assets		370	302
AFS securities at fair value		26	21
Other | Level 1
Assets
Trading assets		306	261
AFS securities at fair value		0	0
Other | Level 2
Assets
Trading assets		64	41
AFS securities at fair value		26	21
Other | Level 3
Assets
Trading assets		0	0
AFS securities at fair value		0	0
Non-agency MBS
Assets
AFS securities at fair value		3,028	3,117
Non-agency MBS | Level 1
Assets
AFS securities at fair value		0	0
Non-agency MBS | Level 2
Assets
AFS securities at fair value		3,028	3,117
Fair Value, Concentration of Credit Risk, Master Netting Arrangements
Assets
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	[1]	(1,923)	(1,769)
Liabilities
Amount Offset	[1]	$ (2,056)	$ (1,778)

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