Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2021	Dec. 31, 2020
Assets
Investment securities – available for sale	$ 124,127	$ 87,358
Mortgage servicing rights	1,833	1,242
Financial derivatives	5,251	4,379
Liabilities
Financial derivatives	$ 1,351	$ 584
Assets At Fair Value \| Assets, Total \| Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk, percentage	26.00%	22.00%
Level 3 Assets \| Assets, Total \| Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk, percentage	4.00%	5.00%
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	1.00%	1.00%
Level Three Liabilities \| Liabilities, Total \| Liability
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Concentration risk, percentage	9.00%	9.00%
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	$ 124,127	$ 87,358
Loans	1,609	1,365
Equity investments	2,804	2,629
Trading securities	1,878	2,238
Financial derivatives	7,035	6,533
Other assets	497	454
Total Assets	141,810	103,035
Liabilities
Other borrowed funds	952	707
Financial derivatives	4,781	2,756
Other liabilities	167	43
Total liabilities	5,900	3,506
Level 1 \| Fair Value, Recurring
Assets
Investment securities – available for sale	36,613	16,675
Equity investments	1,071	1,070
Trading securities	570	548
Financial derivatives	1
Other assets	395	373
Total Assets	38,650	18,666
Liabilities
Other borrowed funds	832	661
Total liabilities	832	661
Level 2 \| Fair Value, Recurring
Assets
Investment securities – available for sale	86,102	69,036
Loans	673	718
Trading securities	1,308	1,690
Financial derivatives	6,978	6,415
Other assets	102	81
Total Assets	97,053	78,936
Liabilities
Other borrowed funds	116	44
Financial derivatives	4,450	2,483
Total liabilities	4,566	2,527
Level 3 \| Fair Value, Recurring
Assets
Investment securities – available for sale	1,412	1,647
Loans	936	647
Equity investments	1,530	1,263
Financial derivatives	56	118
Total Assets	5,904	5,137
Liabilities
Other borrowed funds	4	2
Financial derivatives	331	273
Other liabilities	167	43
Total liabilities	502	318
Residential mortgage loans held for sale \| Fair Value, Recurring
Assets
Loans held for sale	1,519	854
Residential mortgage loans held for sale \| Level 2 \| Fair Value, Recurring
Assets
Loans held for sale	1,433	691
Residential mortgage loans held for sale \| Level 3 \| Fair Value, Recurring
Assets
Loans held for sale	86	163
Commercial mortgage loans held for sale \| Fair Value, Recurring
Assets
Loans held for sale	508	362
Commercial mortgage loans held for sale \| Level 2 \| Fair Value, Recurring
Assets
Loans held for sale	457	305
Commercial mortgage loans held for sale \| Level 3 \| Fair Value, Recurring
Assets
Loans held for sale	51	57
U.S. Treasury and government agencies \| Fair Value, Recurring
Assets
Investment securities – available for sale	40,969	20,711
U.S. Treasury and government agencies \| Level 1 \| Fair Value, Recurring
Assets
Investment securities – available for sale	36,613	16,675
U.S. Treasury and government agencies \| Level 2 \| Fair Value, Recurring
Assets
Investment securities – available for sale	4,356	4,036
Residential mortgage-backed \| Mortgage-backed Securities Agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	65,185	48,911
Residential mortgage-backed \| Mortgage-backed Securities Non-agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	1,242	1,501
Residential mortgage-backed \| Level 2 \| Mortgage-backed Securities Agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	65,185	48,911
Residential mortgage-backed \| Level 2 \| Mortgage-backed Securities Non-agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	74	136
Residential mortgage-backed \| Level 3 \| Mortgage-backed Securities Non-agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	1,168	1,365
Commercial mortgage-backed \| Mortgage-backed Securities Agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	2,060	2,688
Commercial mortgage-backed \| Mortgage-backed Securities Non-agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	3,671	3,689
Commercial mortgage-backed \| Level 2 \| Mortgage-backed Securities Agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	2,060	2,688
Commercial mortgage-backed \| Level 2 \| Mortgage-backed Securities Non-agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	3,668	3,678
Commercial mortgage-backed \| Level 3 \| Mortgage-backed Securities Non-agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	3	11
Asset-backed \| Fair Value, Recurring
Assets
Investment securities – available for sale	6,067	5,150
Asset-backed \| Level 2 \| Fair Value, Recurring
Assets
Investment securities – available for sale	5,895	4,951
Asset-backed \| Level 3 \| Fair Value, Recurring
Assets
Investment securities – available for sale	172	199
Other \| Fair Value, Recurring
Assets
Investment securities – available for sale	4,933	4,708
Other \| Level 2 \| Fair Value, Recurring
Assets
Investment securities – available for sale	4,864	4,636
Other \| Level 3 \| Fair Value, Recurring
Assets
Investment securities – available for sale	69	72
Residential mortgage servicing rights \| Fair Value, Recurring
Assets
Mortgage servicing rights	1,130	673
Residential mortgage servicing rights \| Level 3 \| Fair Value, Recurring
Assets
Mortgage servicing rights	1,130	673
Commercial mortgage servicing rights \| Fair Value, Recurring
Assets
Mortgage servicing rights	703	569
Commercial mortgage servicing rights \| Level 3 \| Fair Value, Recurring
Assets
Mortgage servicing rights	$ 703	$ 569

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