Fair Value Disclosures - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Millions		Jun. 30, 2025	Dec. 31, 2024
Assets
Trading assets		$ 5,963	$ 5,100
AFS securities at fair value		66,390	67,464
Loans Held for Sale, Fair Value		1,105	1,233
Loans and leases		12	13
Loan servicing rights at fair value		$ 3,612	3,708
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other assets (including $1,977 and $1,271 at fair value, respectively)
Derivative Asset, Net		$ 1,647	966
Derivative Asset, Gross		3,339	2,824
Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset		(1,692)	(1,858)
Equity securities		330	305
Total assets		79,059	78,789
Liabilities
Interest-Bearing Deposit, Fair Value		396	192
Financial Instruments Sold, Not yet Purchased, at Fair Value		1,999	1,694
Trading Liabilities		200	202
Derivative liabilities		1,812	2,286
Derivative Liability, Gross		4,596	4,700
Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset		(2,784)	(2,414)
Total liabilities		4,407	$ 4,374
Derivative Liability, Statement of Financial Position [Extensible Enumeration]			Other Liabilities
Level 1
Assets
Trading assets		916	$ 680
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		1,212	1,147
Equity securities		278	298
Total assets		2,406	2,125
Liabilities
Interest-Bearing Deposit, Fair Value		0	0
Financial Instruments Sold, Not yet Purchased, at Fair Value		497	358
Trading Liabilities		0	0
Derivative Liability, Gross		546	569
Total liabilities		1,043	927
Level 2
Assets
Trading assets		5,047	4,420
AFS securities at fair value		66,390	67,464
Loans Held for Sale, Fair Value		1,105	1,233
Loans and leases		0	0
Loan servicing rights at fair value		0	0
Derivative Asset, Gross		2,121	1,675
Equity securities		52	7
Total assets		74,715	74,799
Liabilities
Interest-Bearing Deposit, Fair Value		396	192
Financial Instruments Sold, Not yet Purchased, at Fair Value		1,502	1,336
Trading Liabilities		200	202
Derivative Liability, Gross		4,024	4,088
Total liabilities		6,122	5,818
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		12	13
Loan servicing rights at fair value		3,612	3,708
Derivative Asset, Gross		6	2
Equity securities		0	0
Total assets		3,630	3,723
Liabilities
Interest-Bearing Deposit, Fair Value		0	0
Financial Instruments Sold, Not yet Purchased, at Fair Value		0	0
Trading Liabilities		0	0
Derivative Liability, Gross		26	43
Total liabilities		26	43
U.S. Treasury
Assets
Trading assets		220	143
AFS securities at fair value		13,471	14,411
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		220	143
AFS securities at fair value		13,471	14,411
U.S. Treasury | Level 3
Assets
Trading assets		0	0
AFS securities at fair value		0	0
GSE
Assets
Trading assets		42	41
AFS securities at fair value		435	403
GSE | Level 1
Assets
Trading assets		0	0
AFS securities at fair value		0	0
GSE | Level 2
Assets
Trading assets		42	41
AFS securities at fair value		435	403
GSE | Level 3
Assets
Trading assets		0	0
AFS securities at fair value		0	0
Agency MBS – residential
Assets
AFS securities at fair value		49,455	49,959
Agency MBS – residential | Level 1
Assets
AFS securities at fair value		0	0
Agency MBS – residential | Level 2
Assets
AFS securities at fair value		49,455	49,959
Agency MBS – residential | Level 3
Assets
AFS securities at fair value		0	0
Agency MBS – commercial
Assets
AFS securities at fair value		2,653	2,293
Agency MBS – commercial | Level 1
Assets
AFS securities at fair value		0	0
Agency MBS – commercial | Level 2
Assets
AFS securities at fair value		2,653	2,293
Agency MBS – commercial | Level 3
Assets
AFS securities at fair value		0	0
States and political subdivisions
Assets
Trading assets		796	786
AFS securities at fair value		361	382
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		796	786
AFS securities at fair value		361	382
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		1,720	1,679
Corporate and other debt securities | Level 1
Assets
Trading assets		0	0
Corporate and other debt securities | Level 2
Assets
Trading assets		1,720	1,679
Corporate and other debt securities | Level 3
Assets
Trading assets		0	0
Loans
Assets
Trading assets		2,184	1,671
Loans | Level 1
Assets
Trading assets		0	0
Loans | Level 2
Assets
Trading assets		2,184	1,671
Loans | Level 3
Assets
Trading assets		0	0
Equity securities
Assets
Trading assets		916	413
Equity securities | Level 1
Assets
Trading assets		916	413
Equity securities | Level 2
Assets
Trading assets		0	0
Equity securities | Level 3
Assets
Trading assets		0	0
Other
Assets
Trading assets		85	367
AFS securities at fair value		15	16
Other | Level 1
Assets
Trading assets		0	267
AFS securities at fair value		0	0
Other | Level 2
Assets
Trading assets		85	100
AFS securities at fair value		15	16
Other | Level 3
Assets
Trading assets		0	0
AFS securities at fair value		0	0
Fair Value, Concentration of Risk, Maximum Amount of Loss
Assets
Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset	[1]	(1,692)	(1,858)
Liabilities
Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset	[1]	$ (2,784)	$ (2,414)

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