Fair Value (Recurring Basis Summary) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Assets
Securities available for sale	$ 44,159	$ 131,536
Mortgage servicing rights	3,423	1,818
Financial derivatives	$ 1,531	$ 3,620
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other	Other
Liabilities
Financial derivatives	$ 4,524	$ 985
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Accrued expenses and other liabilities	Accrued expenses and other liabilities
Level 3 assets \| Assets, Total \| Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk, percentage	12.00%	4.00%
Level 3 assets \| Assets \| Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk, percentage	1.00%
Liabilities at fair value \| Liabilities, Total \| Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk, percentage	2.00%	1.00%
Level 3 liabilities \| Liabilities, Total \| Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk, percentage	4.00%	10.00%
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	11.00%	26.00%
Fair Value, Measurements, Recurring
Assets
Securities available for sale	$ 44,159	$ 131,536
Loans	1,310	1,501
Equity investments	3,147	3,231
Trading securities	1,966	1,851
Financial derivatives	3,768	5,152
Other assets	432	518
Total Assets	59,135	147,484
Liabilities
Other borrowed funds	1,466	773
Financial derivatives	7,618	3,570
Other liabilities	294	175
Total liabilities	9,378	4,518
Residential Mortgages \| Fair Value, Measurements, Recurring
Assets
Loans held for sale	654	1,302
Mortgage servicing rights	2,310	1,078
Commercial Mortgages \| Fair Value, Measurements, Recurring
Assets
Loans held for sale	276	575
Mortgage servicing rights	1,113	740
U.S. Treasury and government agencies \| Fair Value, Measurements, Recurring
Assets
Securities available for sale	8,370	46,164
Residential mortgage-backed Securities \| Mortgage-backed Securities Agency \| Fair Value, Measurements, Recurring
Assets
Securities available for sale	28,823	67,632
Residential mortgage-backed Securities \| Mortgage-backed Securities Non-agency \| Fair Value, Measurements, Recurring
Assets
Securities available for sale	819	1,158
Commercial Mortgage Backed Securities \| Mortgage-backed Securities Agency \| Fair Value, Measurements, Recurring
Assets
Securities available for sale	1,675	1,773
Commercial Mortgage Backed Securities \| Mortgage-backed Securities Non-agency \| Fair Value, Measurements, Recurring
Assets
Securities available for sale	1,256	3,436
Asset-backed \| Fair Value, Measurements, Recurring
Assets
Securities available for sale	129	6,409
Other \| Fair Value, Measurements, Recurring
Assets
Securities available for sale	3,087	4,964
Level 1 \| Fair Value, Measurements, Recurring
Assets
Securities available for sale	8,108	41,873
Equity investments	1,173	1,373
Trading securities	798	250
Financial derivatives	16	5
Other assets	352	404
Total Assets	10,447	43,905
Liabilities
Other borrowed funds	1,230	725
Financial derivatives	4
Total liabilities	1,234	725
Level 1 \| U.S. Treasury and government agencies \| Fair Value, Measurements, Recurring
Assets
Securities available for sale	8,108	41,873
Level 2 \| Fair Value, Measurements, Recurring
Assets
Securities available for sale	35,050	88,331
Loans	541	617
Trading securities	1,168	1,601
Financial derivatives	3,747	5,109
Other assets	80	114
Total Assets	41,240	97,519
Liabilities
Other borrowed funds	232	45
Financial derivatives	7,491	3,285
Total liabilities	7,723	3,330
Level 2 \| Residential Mortgages \| Fair Value, Measurements, Recurring
Assets
Loans held for sale	411	1,221
Level 2 \| Commercial Mortgages \| Fair Value, Measurements, Recurring
Assets
Loans held for sale	243	526
Level 2 \| U.S. Treasury and government agencies \| Fair Value, Measurements, Recurring
Assets
Securities available for sale	262	4,291
Level 2 \| Residential mortgage-backed Securities \| Mortgage-backed Securities Agency \| Fair Value, Measurements, Recurring
Assets
Securities available for sale	28,823	67,632
Level 2 \| Residential mortgage-backed Securities \| Mortgage-backed Securities Non-agency \| Fair Value, Measurements, Recurring
Assets
Securities available for sale		61
Level 2 \| Commercial Mortgage Backed Securities \| Mortgage-backed Securities Agency \| Fair Value, Measurements, Recurring
Assets
Securities available for sale	1,675	1,773
Level 2 \| Commercial Mortgage Backed Securities \| Mortgage-backed Securities Non-agency \| Fair Value, Measurements, Recurring
Assets
Securities available for sale	1,253	3,433
Level 2 \| Asset-backed \| Fair Value, Measurements, Recurring
Assets
Securities available for sale	5	6,246
Level 2 \| Other \| Fair Value, Measurements, Recurring
Assets
Securities available for sale	3,032	4,895
Level 3 \| Fair Value, Measurements, Recurring
Assets
Securities available for sale	1,001	1,332
Loans	769	884
Equity investments	1,778	1,680
Financial derivatives	5	38
Total Assets	7,252	5,882
Liabilities
Other borrowed funds	4	3
Financial derivatives	123	285
Other liabilities	294	175
Total liabilities	421	463
Level 3 \| Residential Mortgages \| Fair Value, Measurements, Recurring
Assets
Loans held for sale	243	81
Mortgage servicing rights	2,310	1,078
Level 3 \| Commercial Mortgages \| Fair Value, Measurements, Recurring
Assets
Loans held for sale	33	49
Mortgage servicing rights	1,113	740
Level 3 \| Residential mortgage-backed Securities \| Mortgage-backed Securities Non-agency \| Fair Value, Measurements, Recurring
Assets
Securities available for sale	819	1,097
Level 3 \| Commercial Mortgage Backed Securities \| Mortgage-backed Securities Non-agency \| Fair Value, Measurements, Recurring
Assets
Securities available for sale	3	3
Level 3 \| Asset-backed \| Fair Value, Measurements, Recurring
Assets
Securities available for sale	124	163
Level 3 \| Other \| Fair Value, Measurements, Recurring
Assets
Securities available for sale	$ 55	$ 69

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