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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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