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Loans - Commercial Banking: Risk Profile by Internal Risk Rating (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Total loans held for investment | $ 443,159 | $ 327,775
Commercial Banking: |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Term Loans by Vintage Year, Year 1 | 6,447 | 7,750
Term Loans by Vintage Year, Year 2 | 7,205 | 8,958
Term Loans by Vintage Year, Year 3 | 7,633 | 15,782
Term Loans by Vintage Year, Year 4 | 12,830 | 8,352
Term Loans by Vintage Year, Year 5 | 6,544 | 4,105
Prior | 14,179 | 12,646
Total Term Loans | 54,838 | 57,593
Revolving Loans | 33,872 | 29,265
Revolving Loans Converted to Term | 182 | 317
Total loans held for investment | 88,892 | 87,175
Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Term Loans by Vintage Year, Year 1 | 1,691 | 1,914
Term Loans by Vintage Year, Year 2 | 1,753 | 2,663
Term Loans by Vintage Year, Year 3 | 2,290 | 4,964
Term Loans by Vintage Year, Year 4 | 3,948 | 2,368
Term Loans by Vintage Year, Year 5 | 1,728 | 1,099
Prior | 6,093 | 6,058
Total Term Loans | 17,503 | 19,066
Revolving Loans | 15,906 | 12,786
Revolving Loans Converted to Term | 52 | 51
Total loans held for investment | 33,461 | 31,903
Commercial Banking: | Commercial and multifamily real estate | Noncriticized |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Term Loans by Vintage Year, Year 1 | 1,681 | 1,820
Term Loans by Vintage Year, Year 2 | 1,623 | 2,574
Term Loans by Vintage Year, Year 3 | 2,207 | 3,846
Term Loans by Vintage Year, Year 4 | 3,516 | 2,230
Term Loans by Vintage Year, Year 5 | 1,530 | 903
Prior | 4,919 | 4,887
Total Term Loans | 15,476 | 16,260
Revolving Loans | 15,875 | 12,691
Revolving Loans Converted to Term | 50 | 49
Total loans held for investment | 31,401 | 29,000
Commercial Banking: | Commercial and multifamily real estate | Criticized | Criticized performing |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Term Loans by Vintage Year, Year 1 | 0 | 71
Term Loans by Vintage Year, Year 2 | 113 | 89
Term Loans by Vintage Year, Year 3 | 83 | 1,072
Term Loans by Vintage Year, Year 4 | 410 | 35
Term Loans by Vintage Year, Year 5 | 121 | 110
Prior | 947 | 922
Total Term Loans | 1,674 | 2,299
Revolving Loans | 31 | 93
Revolving Loans Converted to Term | 2 | 2
Total loans held for investment | 1,707 | 2,394
Commercial Banking: | Commercial and multifamily real estate | Criticized | Criticized nonperforming |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Term Loans by Vintage Year, Year 1 | 10 | 23
Term Loans by Vintage Year, Year 2 | 17 | 0
Term Loans by Vintage Year, Year 3 | 0 | 46
Term Loans by Vintage Year, Year 4 | 22 | 103
Term Loans by Vintage Year, Year 5 | 77 | 86
Prior | 227 | 249
Total Term Loans | 353 | 507
Revolving Loans | 0 | 2
Revolving Loans Converted to Term | 0 | 0
Total loans held for investment | 353 | 509
Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Term Loans by Vintage Year, Year 1 | 4,756 | 5,836
Term Loans by Vintage Year, Year 2 | 5,452 | 6,295
Term Loans by Vintage Year, Year 3 | 5,343 | 10,818
Term Loans by Vintage Year, Year 4 | 8,882 | 5,984
Term Loans by Vintage Year, Year 5 | 4,816 | 3,006
Prior | 8,086 | 6,588
Total Term Loans | 37,335 | 38,527
Revolving Loans | 17,966 | 16,479
Revolving Loans Converted to Term | 130 | 266
Total loans held for investment | 55,431 | 55,272
Commercial Banking: | Commercial and industrial | Noncriticized |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Term Loans by Vintage Year, Year 1 | 4,743 | 5,694
Term Loans by Vintage Year, Year 2 | 5,236 | 6,092
Term Loans by Vintage Year, Year 3 | 5,159 | 9,952
Term Loans by Vintage Year, Year 4 | 8,183 | 5,009
Term Loans by Vintage Year, Year 5 | 3,832 | 2,730
Prior | 7,437 | 6,239
Total Term Loans | 34,590 | 35,716
Revolving Loans | 16,981 | 15,449
Revolving Loans Converted to Term | 126 | 266
Total loans held for investment | 51,697 | 51,431
Commercial Banking: | Commercial and industrial | Criticized | Criticized performing |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Term Loans by Vintage Year, Year 1 | 3 | 101
Term Loans by Vintage Year, Year 2 | 191 | 190
Term Loans by Vintage Year, Year 3 | 172 | 680
Term Loans by Vintage Year, Year 4 | 415 | 932
Term Loans by Vintage Year, Year 5 | 787 | 92
Prior | 415 | 258
Total Term Loans | 1,983 | 2,253
Revolving Loans | 864 | 887
Revolving Loans Converted to Term | 4 | 0
Total loans held for investment | 2,851 | 3,140
Commercial Banking: | Commercial and industrial | Criticized | Criticized nonperforming |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Term Loans by Vintage Year, Year 1 | 10 | 41
Term Loans by Vintage Year, Year 2 | 25 | 13
Term Loans by Vintage Year, Year 3 | 12 | 186
Term Loans by Vintage Year, Year 4 | 284 | 43
Term Loans by Vintage Year, Year 5 | 197 | 184
Prior | 234 | 91
Total Term Loans | 762 | 558
Revolving Loans | 121 | 143
Revolving Loans Converted to Term | 0 | 0
Total loans held for investment | $ 883 | $ 701

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