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Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Assets |  |
Investment securities – available for sale | $ 60,338 | $ 41,785
Mortgage servicing rights | 3,503 | 3,686
Financial derivatives | 1,116 | 897
Liabilities |  |
Financial derivatives | 2,360 | 3,538
Other liabilities | $ 100 | $ 100
Assets At Fair Value | Assets, Total | Assets |  |
Liabilities |  |
Concentration risk, percentage | 13.00% | 10.00%
Level 3 Assets | Assets, Total | Assets |  |
Liabilities |  |
Concentration risk, percentage | 10.00% | 13.00%
Level 3 Assets | Assets | Assets |  |
Liabilities |  |
Concentration risk, percentage | 1.00% | 1.00%
Liabilities At Fair Value | Liabilities, Total | Liability |  |
Liabilities |  |
Concentration risk, percentage | 1.00% | 1.00%
Level Three Liabilities | Liabilities, Total | Liability |  |
Liabilities |  |
Concentration risk, percentage | 7.00% | 6.00%
Level Three Liabilities | Liability | Liability |  |
Liabilities |  |
Concentration risk, percentage | 1.00% | 1.00%
Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | $ 60,338 | $ 41,785
Loans | 1,173 | 1,238
Equity investments | 3,242 | 2,717
Trading securities | 2,967 | 2,799
Financial derivatives | 3,308 | 3,429
Other assets | 575 | 496
Total Assets | 75,841 | 56,862
Liabilities |  |
Other borrowed funds | 1,553 | 817
Financial derivatives | 4,627 | 5,899
Other liabilities | 176 | 237
Total liabilities | 6,356 | 6,953
Level 1 | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 21,584 | 6,292
Equity investments | 976 | 574
Trading securities | 1,000 | 377
Financial derivatives | 21 | 29
Other assets | 453 | 403
Total Assets | 24,034 | 7,675
Liabilities |  |
Other borrowed funds | 1,383 | 724
Financial derivatives | 6 | 11
Total liabilities | 1,389 | 735
Level 2 | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 37,873 | 34,537
Loans | 489 | 512
Trading securities | 1,967 | 2,422
Financial derivatives | 3,275 | 3,394
Other assets | 114 | 85
Total Assets | 44,379 | 41,548
Liabilities |  |
Other borrowed funds | 162 | 84
Financial derivatives | 4,340 | 5,736
Total liabilities | 4,502 | 5,820
Level 3 |  |
Assets |  |
Equity investments | 2,063 | 1,952
Liabilities |  |
Financial derivatives | 276 | 145
Level 3 | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 881 | 956
Loans | 684 | 726
Equity investments | 2,063 | 1,952
Financial derivatives | 12 | 6
Other assets | 8 | 8
Total Assets | 7,225 | 7,448
Liabilities |  |
Other borrowed funds | 8 | 9
Financial derivatives | 281 | 152
Other liabilities | 176 | 237
Total liabilities | 465 | 398
Residential mortgage loans held for sale | Fair Value, Recurring |  |
Assets |  |
Commercial mortgage loans held for sale | 658 | 474
Residential mortgage loans held for sale | Level 2 | Fair Value, Recurring |  |
Assets |  |
Commercial mortgage loans held for sale | 588 | 371
Residential mortgage loans held for sale | Level 3 | Fair Value, Recurring |  |
Assets |  |
Commercial mortgage loans held for sale | 70 | 103
Commercial mortgage loans held for sale | Fair Value, Recurring |  |
Assets |  |
Commercial mortgage loans held for sale | 77 | 238
Commercial mortgage loans held for sale | Level 2 | Fair Value, Recurring |  |
Assets |  |
Commercial mortgage loans held for sale | 73 | 227
Commercial mortgage loans held for sale | Level 3 | Fair Value, Recurring |  |
Assets |  |
Commercial mortgage loans held for sale | 4 | 11
U.S. Treasury and government agencies | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 22,639 | 6,951
U.S. Treasury and government agencies | Level 1 | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 21,584 | 6,292
U.S. Treasury and government agencies | Level 2 | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 1,055 | 659
Residential mortgage-backed | Mortgage-backed Securities Agency | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 29,661 | 27,880
Residential mortgage-backed | Mortgage-backed Securities Non-agency | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 628 | 696
Residential mortgage-backed | Level 2 | Mortgage-backed Securities Agency | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 29,661 | 27,880
Residential mortgage-backed | Level 2 | Mortgage-backed Securities Non-agency | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale |  |
Residential mortgage-backed | Level 3 | Mortgage-backed Securities Non-agency | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 628 | 696
Commercial mortgage servicing rights | Mortgage-backed Securities Agency | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 1,892 | 1,546
Commercial mortgage servicing rights | Mortgage-backed Securities Non-agency | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 734 | 869
Commercial mortgage servicing rights | Level 2 | Mortgage-backed Securities Agency | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 1,892 | 1,546
Commercial mortgage servicing rights | Level 2 | Mortgage-backed Securities Non-agency | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 631 | 766
Commercial mortgage servicing rights | Level 3 | Mortgage-backed Securities Non-agency | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 103 | 103
Asset-backed | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 2,289 | 1,116
Asset-backed | Level 2 | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 2,193 | 1,014
Asset-backed | Level 3 | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 96 | 102
Other | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 2,495 | 2,727
Other | Level 2 | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 2,441 | 2,672
Other | Level 3 | Fair Value, Recurring |  |
Assets |  |
Investment securities – available for sale | 54 | 55
Residential mortgage servicing rights | Fair Value, Recurring |  |
Assets |  |
Mortgage servicing rights | 2,528 | 2,654
Residential mortgage servicing rights | Level 3 | Fair Value, Recurring |  |
Assets |  |
Mortgage servicing rights | 2,528 | 2,654
Commercial mortgage servicing rights | Fair Value, Recurring |  |
Assets |  |
Mortgage servicing rights | 975 | 1,032
Commercial mortgage servicing rights | Level 3 | Fair Value, Recurring |  |
Assets |  |
Mortgage servicing rights | $ 975 | $ 1,032

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