Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2022	Dec. 31, 2021
Assets
Investment securities – available for sale	$ 52,984	$ 131,536
Mortgage servicing rights	2,608	1,818
Financial derivatives	3,237	3,620
Liabilities
Financial derivatives	$ 3,725	$ 985
Assets At Fair Value \| Assets, Total \| Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk, percentage	13.00%	26.00%
Level 3 Assets \| Assets, Total \| Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk, percentage	10.00%	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	4.00%	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	$ 52,984	$ 131,536
Loans	1,292	1,501
Equity investments	3,318	3,231
Trading securities	2,231	1,851
Financial derivatives	5,392	5,152
Other assets	436	518
Total Assets	69,243	147,484
Liabilities
Other borrowed funds	1,730	773
Financial derivatives	7,590	3,570
Other liabilities	182	175
Total liabilities	9,502	4,518
Level 1 \| Fair Value, Recurring
Assets
Investment securities – available for sale	11,820	41,873
Equity investments	1,269	1,373
Trading securities	829	250
Financial derivatives	10	5
Other assets	351	404
Total Assets	14,279	43,905
Liabilities
Other borrowed funds	1,561	725
Financial derivatives	9
Total liabilities	1,570	725
Level 2 \| Fair Value, Recurring
Assets
Investment securities – available for sale	40,031	88,331
Loans	488	617
Trading securities	1,402	1,601
Financial derivatives	5,369	5,109
Other assets	85	114
Total Assets	48,236	97,519
Liabilities
Other borrowed funds	166	45
Financial derivatives	7,368	3,285
Total liabilities	7,534	3,330
Level 3 \| Fair Value, Recurring
Assets
Investment securities – available for sale	1,133	1,332
Loans	804	884
Equity investments	1,867	1,680
Financial derivatives	13	38
Total Assets	6,546	5,882
Liabilities
Other borrowed funds	3	3
Financial derivatives	213	285
Other liabilities	182	175
Total liabilities	398	463
Residential mortgage loans held for sale \| Fair Value, Recurring
Assets
Loans held for sale	876	1,302
Residential mortgage loans held for sale \| Level 2 \| Fair Value, Recurring
Assets
Loans held for sale	793	1,221
Residential mortgage loans held for sale \| Level 3 \| Fair Value, Recurring
Assets
Loans held for sale	83	81
Commercial mortgage loans held for sale \| Fair Value, Recurring
Assets
Loans held for sale	106	575
Commercial mortgage loans held for sale \| Level 2 \| Fair Value, Recurring
Assets
Loans held for sale	68	526
Commercial mortgage loans held for sale \| Level 3 \| Fair Value, Recurring
Assets
Loans held for sale	38	49
U.S. Treasury and government agencies \| Fair Value, Recurring
Assets
Investment securities – available for sale	13,043	46,164
U.S. Treasury and government agencies \| Level 1 \| Fair Value, Recurring
Assets
Investment securities – available for sale	11,820	41,873
U.S. Treasury and government agencies \| Level 2 \| Fair Value, Recurring
Assets
Investment securities – available for sale	1,223	4,291
Residential mortgage-backed \| Mortgage-backed Securities Agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	32,179	67,632
Residential mortgage-backed \| Mortgage-backed Securities Non-agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	925	1,158
Residential mortgage-backed \| Level 2 \| Mortgage-backed Securities Agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	32,179	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	925	1,097
Commercial mortgage-backed \| Mortgage-backed Securities Agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	1,947	1,773
Commercial mortgage-backed \| Mortgage-backed Securities Non-agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	1,350	3,436
Commercial mortgage-backed \| Level 2 \| Mortgage-backed Securities Agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	1,947	1,773
Commercial mortgage-backed \| Level 2 \| Mortgage-backed Securities Non-agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	1,347	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	143	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	138	163
Other \| Fair Value, Recurring
Assets
Investment securities – available for sale	3,397	4,964
Other \| Level 2 \| Fair Value, Recurring
Assets
Investment securities – available for sale	3,330	4,895
Other \| Level 3 \| Fair Value, Recurring
Assets
Investment securities – available for sale	67	69
Residential mortgage servicing rights \| Fair Value, Recurring
Assets
Mortgage servicing rights	1,620	1,078
Residential mortgage servicing rights \| Level 3 \| Fair Value, Recurring
Assets
Mortgage servicing rights	1,620	1,078
Commercial mortgage servicing rights \| Fair Value, Recurring
Assets
Mortgage servicing rights	988	740
Commercial mortgage servicing rights \| Level 3 \| Fair Value, Recurring
Assets
Mortgage servicing rights	$ 988	$ 740

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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