Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2022	Dec. 31, 2021
Assets
Investment securities – available for sale	$ 45,798	$ 131,536
Mortgage servicing rights	3,206	1,818
Financial derivatives	2,812	3,620
Liabilities
Financial derivatives	$ 5,391	$ 985
Assets At Fair Value \| Assets, Total \| Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk, percentage	11.00%	26.00%
Level 3 Assets \| Assets, Total \| Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk, percentage	11.00%	4.00%
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 \| Liability
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk, percentage	2.00%	1.00%
Level Three Liabilities \| Liabilities, Total \| Liability
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk, percentage	3.00%	10.00%
Level Three Liabilities \| Liability \| Liability
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk, percentage	1.00%	1.00%
Fair Value, Recurring
Assets
Investment securities – available for sale	$ 45,798	$ 131,536
Loans	1,278	1,501
Equity investments	3,050	3,231
Trading securities	2,607	1,851
Financial derivatives	5,868	5,152
Other assets	438	518
Total Assets	63,315	147,484
Liabilities
Other borrowed funds	1,613	773
Financial derivatives	9,737	3,570
Other liabilities	269	175
Total liabilities	11,619	4,518
Level 1 \| Fair Value, Recurring
Assets
Investment securities – available for sale	9,938	41,873
Equity investments	1,074	1,373
Trading securities	934	250
Financial derivatives	3	5
Other assets	337	404
Total Assets	12,286	43,905
Liabilities
Other borrowed funds	1,408	725
Financial derivatives	3
Total liabilities	1,411	725
Level 2 \| Fair Value, Recurring
Assets
Investment securities – available for sale	34,790	88,331
Loans	503	617
Trading securities	1,673	1,601
Financial derivatives	5,857	5,109
Other assets	101	114
Total Assets	43,843	97,519
Liabilities
Other borrowed funds	203	45
Financial derivatives	9,614	3,285
Total liabilities	9,817	3,330
Level 3 \| Fair Value, Recurring
Assets
Investment securities – available for sale	1,070	1,332
Loans	775	884
Equity investments	1,795	1,680
Financial derivatives	8	38
Total Assets	7,005	5,882
Liabilities
Other borrowed funds	2	3
Financial derivatives	120	285
Other liabilities	269	175
Total liabilities	391	463
Residential mortgage loans held for sale \| Fair Value, Recurring
Assets
Loans held for sale	835	1,302
Residential mortgage loans held for sale \| Level 2 \| Fair Value, Recurring
Assets
Loans held for sale	719	1,221
Residential mortgage loans held for sale \| Level 3 \| Fair Value, Recurring
Assets
Loans held for sale	116	81
Commercial mortgage loans held for sale \| Fair Value, Recurring
Assets
Loans held for sale	235	575
Commercial mortgage loans held for sale \| Level 2 \| Fair Value, Recurring
Assets
Loans held for sale	200	526
Commercial mortgage loans held for sale \| Level 3 \| Fair Value, Recurring
Assets
Loans held for sale	35	49
U.S. Treasury and government agencies \| Fair Value, Recurring
Assets
Investment securities – available for sale	10,218	46,164
U.S. Treasury and government agencies \| Level 1 \| Fair Value, Recurring
Assets
Investment securities – available for sale	9,938	41,873
U.S. Treasury and government agencies \| Level 2 \| Fair Value, Recurring
Assets
Investment securities – available for sale	280	4,291
Residential mortgage-backed \| Mortgage-backed Securities Agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	28,388	67,632
Residential mortgage-backed \| Mortgage-backed Securities Non-agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	871	1,158
Residential mortgage-backed \| Level 2 \| Mortgage-backed Securities Agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	28,388	67,632
Residential mortgage-backed \| Level 2 \| Mortgage-backed Securities Non-agency \| Fair Value, Recurring
Assets
Investment securities – available for sale		61
Residential mortgage-backed \| Level 3 \| Mortgage-backed Securities Non-agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	871	1,097
Commercial mortgage-backed \| Mortgage-backed Securities Agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	1,755	1,773
Commercial mortgage-backed \| Mortgage-backed Securities Non-agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	1,303	3,436
Commercial mortgage-backed \| Level 2 \| Mortgage-backed Securities Agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	1,755	1,773
Commercial mortgage-backed \| Level 2 \| Mortgage-backed Securities Non-agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	1,300	3,433
Commercial mortgage-backed \| Level 3 \| Mortgage-backed Securities Non-agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	3	3
Asset-backed \| Fair Value, Recurring
Assets
Investment securities – available for sale	132	6,409
Asset-backed \| Level 2 \| Fair Value, Recurring
Assets
Investment securities – available for sale	5	6,246
Asset-backed \| Level 3 \| Fair Value, Recurring
Assets
Investment securities – available for sale	127	163
Other \| Fair Value, Recurring
Assets
Investment securities – available for sale	3,131	4,964
Other \| Level 2 \| Fair Value, Recurring
Assets
Investment securities – available for sale	3,062	4,895
Other \| Level 3 \| Fair Value, Recurring
Assets
Investment securities – available for sale	69	69
Residential mortgage servicing rights \| Fair Value, Recurring
Assets
Mortgage servicing rights	2,074	1,078
Residential mortgage servicing rights \| Level 3 \| Fair Value, Recurring
Assets
Mortgage servicing rights	2,074	1,078
Commercial mortgage servicing rights \| Fair Value, Recurring
Assets
Mortgage servicing rights	1,132	740
Commercial mortgage servicing rights \| Level 3 \| Fair Value, Recurring
Assets
Mortgage servicing rights	$ 1,132	$ 740

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