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Fair Value (Recurring Basis Summary) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Assets |  |
Securities available for sale | $ 41,785 | $ 44,159
Mortgage servicing rights | 3,686 | 3,423
Financial derivatives | $ 897 | $ 1,531
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other | Other
Liabilities |  |
Financial derivatives | $ 3,538 | $ 4,524
Derivative Liability, Statement of Financial Position [Extensible Enumeration] | Accrued expenses and other liabilities (b) | Accrued expenses and other liabilities (b)
Level 3 assets | Assets, Total | Assets |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Concentration risk, percentage | 13.00% | 12.00%
Level 3 assets | Assets | Assets |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Concentration risk, percentage | 1.00% |
Liabilities at fair value | Liabilities, Total | Liabilities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Concentration risk, percentage | 1.00% | 2.00%
Level 3 liabilities | Liabilities, Total | Liabilities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Concentration risk, percentage | 6.00% | 4.00%
Level 3 liabilities | Liabilities | Liabilities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Concentration risk, percentage | 1.00% | 1.00%
Assets at fair value | Assets, Total | Assets |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Concentration risk, percentage | 10.00% | 11.00%
Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | $ 41,785 | $ 44,159
Loans | 1,238 | 1,310
Equity investments | 2,717 | 3,147
Trading securities | 2,799 | 1,966
Financial derivatives | 3,429 | 3,768
Other assets | 496 | 432
Total Assets | 56,862 | 59,135
Liabilities |  |
Other borrowed funds | 817 | 1,466
Financial derivatives | 5,899 | 7,618
Other liabilities | 237 | 294
Total liabilities | 6,953 | 9,378
Residential Mortgages | Fair Value, Measurements, Recurring |  |
Assets |  |
Loans held for sale | 474 | 654
Mortgage servicing rights | 2,654 | 2,310
Commercial Mortgages | Fair Value, Measurements, Recurring |  |
Assets |  |
Loans held for sale | 238 | 276
Mortgage servicing rights | 1,032 | 1,113
U.S. Treasury and government agencies | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 6,951 | 8,370
Residential mortgage-backed Securities | Mortgage-backed Securities Agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 27,880 | 28,823
Residential mortgage-backed Securities | Mortgage-backed Securities Non-agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 696 | 819
Commercial Mortgage Backed Securities | Mortgage-backed Securities Agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 1,546 | 1,675
Commercial Mortgage Backed Securities | Mortgage-backed Securities Non-agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 869 | 1,256
Asset-backed | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 1,116 | 129
Other | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 2,727 | 3,087
Level 1 | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 6,292 | 8,108
Equity investments | 574 | 1,173
Trading securities | 377 | 798
Financial derivatives | 29 | 16
Other assets | 403 | 352
Total Assets | 7,675 | 10,447
Liabilities |  |
Other borrowed funds | 724 | 1,230
Financial derivatives | 11 | 4
Total liabilities | 735 | 1,234
Level 1 | U.S. Treasury and government agencies | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 6,292 | 8,108
Level 2 | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 34,537 | 35,050
Loans | 512 | 541
Trading securities | 2,422 | 1,168
Financial derivatives | 3,394 | 3,747
Other assets | 85 | 80
Total Assets | 41,548 | 41,240
Liabilities |  |
Other borrowed funds | 84 | 232
Financial derivatives | 5,736 | 7,491
Total liabilities | 5,820 | 7,723
Level 2 | Residential Mortgages | Fair Value, Measurements, Recurring |  |
Assets |  |
Loans held for sale | 371 | 411
Level 2 | Commercial Mortgages | Fair Value, Measurements, Recurring |  |
Assets |  |
Loans held for sale | 227 | 243
Level 2 | U.S. Treasury and government agencies | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 659 | 262
Level 2 | Residential mortgage-backed Securities | Mortgage-backed Securities Agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 27,880 | 28,823
Level 2 | Residential mortgage-backed Securities | Mortgage-backed Securities Non-agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale |  |
Level 2 | Commercial Mortgage Backed Securities | Mortgage-backed Securities Agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 1,546 | 1,675
Level 2 | Commercial Mortgage Backed Securities | Mortgage-backed Securities Non-agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 766 | 1,253
Level 2 | Asset-backed | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 1,014 | 5
Level 2 | Other | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 2,672 | 3,032
Level 3 | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 956 | 1,001
Loans | 726 | 769
Equity investments | 1,952 | 1,778
Financial derivatives | 6 | 5
Other assets | 8 |
Total Assets | 7,448 | 7,252
Liabilities |  |
Other borrowed funds | 9 | 4
Financial derivatives | 152 | 123
Other liabilities | 237 | 294
Total liabilities | 398 | 421
Level 3 | Residential Mortgages | Fair Value, Measurements, Recurring |  |
Assets |  |
Loans held for sale | 103 | 243
Mortgage servicing rights | 2,654 | 2,310
Level 3 | Commercial Mortgages | Fair Value, Measurements, Recurring |  |
Assets |  |
Loans held for sale | 11 | 33
Mortgage servicing rights | 1,032 | 1,113
Level 3 | Residential mortgage-backed Securities | Mortgage-backed Securities Non-agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 696 | 819
Level 3 | Commercial Mortgage Backed Securities | Mortgage-backed Securities Non-agency | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 103 | 3
Level 3 | Asset-backed | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | 102 | 124
Level 3 | Other | Fair Value, Measurements, Recurring |  |
Assets |  |
Securities available for sale | $ 55 | $ 55

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