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Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Assets |  |
Securities available for sale | $ 87,358 | $ 69,163
Mortgage servicing rights | 1,242 | 1,644
Financial derivatives | 4,379 | 2,196
Liabilities |  |
Financial derivatives | $ 584 | $ 539
Assets at fair value | Assets, Total |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Concentration risk, percentage | 22.00% | 20.00%
Level 3 assets | Assets, Total |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Concentration risk, percentage | 5.00% | 7.00%
Level 3 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 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Concentration risk, percentage | 1.00% | 1.00%
Level 3 liabilities | Liabilities, Total |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Concentration risk, percentage | 9.00% | 13.00%
Level 3 liabilities | Liabilities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Concentration risk, percentage | 1.00% | 1.00%
Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | $ 87,358 | $ 69,163
Loans | 1,365 | 742
Equity investments | 2,629 | 2,421
Trading securities | 2,238 | 3,220
Financial derivatives | 6,533 | 3,502
Other assets | 454 | 470
Total Assets | 103,035 | 82,227
Liabilities |  |
Other borrowed funds | 707 | 518
Financial derivatives | 2,756 | 2,019
Other liabilities | 43 | 137
Total liabilities | 3,506 | 2,674
Residential Mortgages | Fair Value, Measurements, Recurring |  |
Assets |  |
Loans held for sale | 854 | 819
Mortgage servicing rights | 673 | 995
Commercial Mortgages | Fair Value, Measurements, Recurring |  |
Assets |  |
Loans held for sale | 362 | 246
Mortgage servicing rights | 569 | 649
U.S. Treasury and government agencies | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 20,711 | 16,516
Residential mortgage-backed Securities | Mortgage-backed Securities Agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 48,911 | 36,321
Residential mortgage-backed Securities | Mortgage-backed Securities Non-agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 1,501 | 1,814
Commercial Mortgage Backed Securities | Mortgage-backed Securities Agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 2,688 | 3,118
Commercial Mortgage Backed Securities | Mortgage-backed Securities Non-agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 3,689 | 3,372
Asset-backed | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 5,150 | 5,114
Other | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 4,708 | 2,908
Level 1 | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 16,675 | 16,236
Equity investments | 1,070 | 855
Trading securities | 548 | 433
Other assets | 373 | 339
Total Assets | 18,666 | 17,863
Liabilities |  |
Other borrowed funds | 661 | 385
Total liabilities | 661 | 385
Level 1 | U.S. Treasury and government agencies | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 16,675 | 16,236
Level 2 | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 69,036 | 50,872
Loans | 718 | 442
Trading securities | 1,690 | 2,787
Financial derivatives | 6,415 | 3,448
Other assets | 81 | 131
Total Assets | 78,936 | 58,679
Liabilities |  |
Other borrowed funds | 44 | 126
Financial derivatives | 2,483 | 1,819
Total liabilities | 2,527 | 1,945
Level 2 | Residential Mortgages | Fair Value, Measurements, Recurring |  |
Assets |  |
Loans held for sale | 691 | 817
Level 2 | Commercial Mortgages | Fair Value, Measurements, Recurring |  |
Assets |  |
Loans held for sale | 305 | 182
Level 2 | U.S. Treasury and government agencies | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 4,036 | 280
Level 2 | Residential mortgage-backed Securities | Mortgage-backed Securities Agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 48,911 | 36,321
Level 2 | Residential mortgage-backed Securities | Mortgage-backed Securities Non-agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 136 | 73
Level 2 | Commercial Mortgage Backed Securities | Mortgage-backed Securities Agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 2,688 | 3,118
Level 2 | Commercial Mortgage Backed Securities | Mortgage-backed Securities Non-agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 3,678 | 3,372
Level 2 | Asset-backed | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 4,951 | 4,874
Level 2 | Other | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 4,636 | 2,834
Level 3 | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 1,647 | 2,055
Loans | 647 | 300
Equity investments | 1,263 | 1,276
Financial derivatives | 118 | 54
Total Assets | 5,137 | 5,395
Liabilities |  |
Other borrowed funds | 2 | 7
Financial derivatives | 273 | 200
Other liabilities | 43 | 137
Total liabilities | 318 | 344
Level 3 | Residential Mortgages | Fair Value, Measurements, Recurring |  |
Assets |  |
Loans held for sale | 163 | 2
Mortgage servicing rights | 673 | 995
Level 3 | Commercial Mortgages | Fair Value, Measurements, Recurring |  |
Assets |  |
Loans held for sale | 57 | 64
Mortgage servicing rights | 569 | 649
Level 3 | Residential mortgage-backed Securities | Mortgage-backed Securities Non-agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 1,365 | 1,741
Level 3 | Commercial Mortgage Backed Securities | Mortgage-backed Securities Non-agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 11 |
Level 3 | Asset-backed | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 199 | 240
Level 3 | Other | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | $ 72 | $ 74

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