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Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Assets |  |
Investment securities – available for sale | $ 112,313 | $ 131,536
Mortgage servicing rights | 2,208 | 1,818
Financial derivatives | 4,005 | 3,620
Liabilities |  |
Financial derivatives | $ 2,913 | $ 985
Assets At Fair Value | Assets, Total | Assets |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Concentration risk, percentage | 24.00% | 26.00%
Level 3 Assets | Assets, Total | Assets |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Concentration risk, percentage | 5.00% | 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 | 5.00% | 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 | $ 112,313 | $ 131,536
Loans | 1,395 | 1,501
Equity investments | 2,807 | 3,231
Trading securities | 2,395 | 1,851
Financial derivatives | 5,935 | 5,152
Other assets | 491 | 518
Total Assets | 128,890 | 147,484
Liabilities |  |
Other borrowed funds | 1,235 | 773
Financial derivatives | 6,963 | 3,570
Other liabilities | 158 | 175
Total liabilities | 8,356 | 4,518
Level 1 | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 33,016 | 41,873
Equity investments | 876 | 1,373
Trading securities | 651 | 250
Financial derivatives | 5 | 5
Other assets | 391 | 404
Total Assets | 34,939 | 43,905
Liabilities |  |
Other borrowed funds | 1,179 | 725
Financial derivatives | 5 |
Total liabilities | 1,184 | 725
Level 2 | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 78,057 | 88,331
Loans | 544 | 617
Trading securities | 1,744 | 1,601
Financial derivatives | 5,920 | 5,109
Other assets | 100 | 114
Total Assets | 87,558 | 97,519
Liabilities |  |
Other borrowed funds | 53 | 45
Financial derivatives | 6,724 | 3,285
Total liabilities | 6,777 | 3,330
Level 3 | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 1,240 | 1,332
Loans | 851 | 884
Equity investments | 1,751 | 1,680
Financial derivatives | 10 | 38
Total Assets | 6,213 | 5,882
Liabilities |  |
Other borrowed funds | 3 | 3
Financial derivatives | 234 | 285
Other liabilities | 158 | 175
Total liabilities | 395 | 463
Residential mortgage loans held for sale | Fair Value, Recurring |  |
Assets |  |
Loans held for sale | 1,039 | 1,302
Residential mortgage loans held for sale | Level 2 | Fair Value, Recurring |  |
Assets |  |
Loans held for sale | 931 | 1,221
Residential mortgage loans held for sale | Level 3 | Fair Value, Recurring |  |
Assets |  |
Loans held for sale | 108 | 81
Commercial mortgage loans held for sale | Fair Value, Recurring |  |
Assets |  |
Loans held for sale | 307 | 575
Commercial mortgage loans held for sale | Level 2 | Fair Value, Recurring |  |
Assets |  |
Loans held for sale | 262 | 526
Commercial mortgage loans held for sale | Level 3 | Fair Value, Recurring |  |
Assets |  |
Loans held for sale | 45 | 49
U.S. Treasury and government agencies | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 35,221 | 46,164
U.S. Treasury and government agencies | Level 1 | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 33,016 | 41,873
U.S. Treasury and government agencies | Level 2 | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 2,205 | 4,291
Residential mortgage-backed | Mortgage-backed Securities Agency | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 58,815 | 67,632
Residential mortgage-backed | Mortgage-backed Securities Non-agency | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 1,332 | 1,158
Residential mortgage-backed | Level 2 | Mortgage-backed Securities Agency | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 58,815 | 67,632
Residential mortgage-backed | Level 2 | Mortgage-backed Securities Non-agency | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 313 | 61
Residential mortgage-backed | Level 3 | Mortgage-backed Securities Non-agency | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 1,019 | 1,097
Commercial mortgage-backed | Mortgage-backed Securities Agency | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 2,110 | 1,773
Commercial mortgage-backed | Mortgage-backed Securities Non-agency | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 3,455 | 3,436
Commercial mortgage-backed | Level 2 | Mortgage-backed Securities Agency | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 2,110 | 1,773
Commercial mortgage-backed | Level 2 | Mortgage-backed Securities Non-agency | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 3,452 | 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 | 6,305 | 6,409
Asset-backed | Level 2 | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 6,153 | 6,246
Asset-backed | Level 3 | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 152 | 163
Other | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 5,075 | 4,964
Other | Level 2 | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 5,009 | 4,895
Other | Level 3 | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 66 | 69
Residential mortgage servicing rights | Fair Value, Recurring |  |
Assets |  |
Mortgage servicing rights | 1,322 | 1,078
Residential mortgage servicing rights | Level 3 | Fair Value, Recurring |  |
Assets |  |
Mortgage servicing rights | 1,322 | 1,078
Commercial mortgage servicing rights | Fair Value, Recurring |  |
Assets |  |
Mortgage servicing rights | 886 | 740
Commercial mortgage servicing rights | Level 3 | Fair Value, Recurring |  |
Assets |  |
Mortgage servicing rights | $ 886 | $ 740

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