Fair Value (Recurring Basis Summary) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Assets
Securities available-for-sale	$ 62,039	$ 41,785
Mortgage servicing rights	3,711	3,686
Financial derivatives	$ 816	$ 897
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other	Other
Liabilities
Financial derivatives	$ 3,168	$ 3,538
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Accrued expenses and other liabilities	Accrued expenses and other liabilities
Other liabilities	$ 100	$ 100
Level 3 assets \| Assets, Total \| Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk, percentage	10.00%	13.00%
Level 3 assets \| Assets \| Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk, percentage	1.00%	1.00%
Liabilities at fair value \| Liabilities, Total \| Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk, percentage	1.00%	1.00%
Level 3 liabilities \| Liabilities, Total \| Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk, percentage	5.00%	6.00%
Level 3 liabilities \| Liabilities \| Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk, percentage	1.00%	1.00%
Assets at fair value \| Assets, Total \| Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk, percentage	14.00%	10.00%
Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	$ 62,039	$ 41,785
Loans	1,156	1,238
Equity investments	3,132	2,717
Trading securities	2,774	2,799
Financial derivatives	3,011	3,429
Other assets	592	496
Total Assets	77,246	56,862
Liabilities
Other borrowed funds	1,299	817
Financial derivatives	5,495	5,899
Other liabilities	205	237
Total liabilities	6,999	6,953
Residential Mortgages \| Fair Value, Measurements, Recurring
Assets
Loans held for sale	628	474
Mortgage servicing rights	2,626	2,654
Commercial Mortgages \| Fair Value, Measurements, Recurring
Assets
Loans held for sale	203	238
Mortgage servicing rights	1,085	1,032
U.S. Treasury and government agencies \| Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	23,551	6,951
Residential mortgage-backed Securities \| Mortgage-backed Securities Agency \| Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	30,626	27,880
Residential mortgage-backed Securities \| Mortgage-backed Securities Non-agency \| Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	603	696
Commercial Mortgage-Backed Securities \| Mortgage-backed Securities Agency \| Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	1,945	1,546
Commercial Mortgage-Backed Securities \| Mortgage-backed Securities Non-agency \| Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	691	869
Asset-backed \| Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	2,392	1,116
Other \| Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	2,231	2,727
Level 1 \| Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	22,534	6,292
Equity investments	825	574
Trading securities	987	377
Financial derivatives	3	29
Other assets	449	403
Total Assets	24,798	7,675
Liabilities
Other borrowed funds	1,161	724
Financial derivatives	11	11
Total liabilities	1,172	735
Level 1 \| U.S. Treasury and government agencies \| Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	22,534	6,292
Level 2 \| Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	38,652	34,537
Loans	486	512
Trading securities	1,787	2,422
Financial derivatives	3,004	3,394
Other assets	133	85
Total Assets	44,821	41,548
Liabilities
Other borrowed funds	128	84
Financial derivatives	5,334	5,736
Other liabilities	28
Total liabilities	5,490	5,820
Level 2 \| Residential Mortgages \| Fair Value, Measurements, Recurring
Assets
Loans held for sale	560	371
Level 2 \| Commercial Mortgages \| Fair Value, Measurements, Recurring
Assets
Loans held for sale	199	227
Level 2 \| U.S. Treasury and government agencies \| Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	1,017	659
Level 2 \| Residential mortgage-backed Securities \| Mortgage-backed Securities Agency \| Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	30,626	27,880
Level 2 \| Commercial Mortgage-Backed Securities \| Mortgage-backed Securities Agency \| Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	1,945	1,546
Level 2 \| Commercial Mortgage-Backed Securities \| Mortgage-backed Securities Non-agency \| Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	588	766
Level 2 \| Asset-backed \| Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	2,299	1,014
Level 2 \| Other \| Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	2,177	2,672
Level 3
Assets
Equity investments	2,111	1,952
Liabilities
Financial derivatives	143	145
Level 3 \| Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	853	956
Loans	670	726
Equity investments	2,111	1,952
Financial derivatives	4	6
Other assets	10	8
Total Assets	7,431	7,448
Liabilities
Other borrowed funds	10	9
Financial derivatives	150	152
Other liabilities	177	237
Total liabilities	337	398
Level 3 \| Residential Mortgages \| Fair Value, Measurements, Recurring
Assets
Loans held for sale	68	103
Mortgage servicing rights	2,626	2,654
Level 3 \| Commercial Mortgages \| Fair Value, Measurements, Recurring
Assets
Loans held for sale	4	11
Mortgage servicing rights	1,085	1,032
Level 3 \| Residential mortgage-backed Securities \| Mortgage-backed Securities Non-agency \| Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	603	696
Level 3 \| Commercial Mortgage-Backed Securities \| Mortgage-backed Securities Non-agency \| Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	103	103
Level 3 \| Asset-backed \| Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	93	102
Level 3 \| Other \| Fair Value, Measurements, Recurring
Assets
Securities available-for-sale	$ 54	$ 55

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