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Loans - Commercial Banking: Risk Profile by Internal Risk Rating (Detail) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019
--- | --- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment | $ 262,990 | $ 265,809 | $ 240,273
Commercial Banking |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
2020 | 4,602 |  |
2019 | 17,307 |  |
2018 | 9,534 |  |
2017 | 6,019 |  |
2016 | 4,710 |  |
Prior | 11,733 |  |
Total Term Loans | 53,905 |  |
Revolving Loans | 27,170 |  |
Revolving Loans Converted to Term | 85 |  |
Loans held for investment | 81,160 | $ 74,508 |
Internal Risk, Percentage |  | 100.00% |
Commercial Banking | PCI loans |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment |  | $ 31 |
Internal Risk, Percentage |  | 0.00% |
Commercial Banking | Noncriticized |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment |  | $ 71,848 |
Internal Risk, Percentage |  | 96.50% |
Commercial Banking | Criticized | Criticized performing |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment |  | $ 2,181 |
Internal Risk, Percentage |  | 2.90% |
Commercial Banking | Criticized | Criticized nonperforming |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment |  | $ 448 |
Internal Risk, Percentage |  | 0.60% |
Commercial Banking | Commercial and multifamily real estate |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
2020 | 1,846 |  |
2019 | 5,803 |  |
2018 | 4,106 |  |
2017 | 2,364 |  |
2016 | 2,506 |  |
Prior | 7,464 |  |
Total Term Loans | 24,089 |  |
Revolving Loans | 8,284 |  |
Revolving Loans Converted to Term | 0 |  |
Loans held for investment | 32,373 | $ 30,245 |
Internal Risk, Percentage |  | 100.00% |
Commercial Banking | Commercial and multifamily real estate | PCI loans |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment |  | $ 21 |
Internal Risk, Percentage |  | 0.10% |
Commercial Banking | Commercial and multifamily real estate | Noncriticized |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
2020 | 1,846 |  |
2019 | 5,748 |  |
2018 | 4,096 |  |
2017 | 2,264 |  |
2016 | 2,344 |  |
Prior | 7,181 |  |
Total Term Loans | 23,479 |  |
Revolving Loans | 8,284 |  |
Revolving Loans Converted to Term | 0 |  |
Loans held for investment | 31,763 | $ 29,625 |
Internal Risk, Percentage |  | 97.90% |
Commercial Banking | Commercial and multifamily real estate | Criticized | Criticized performing |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
2020 | 0 |  |
2019 | 55 |  |
2018 | 9 |  |
2017 | 91 |  |
2016 | 161 |  |
Prior | 223 |  |
Total Term Loans | 539 |  |
Revolving Loans | 0 |  |
Revolving Loans Converted to Term | 0 |  |
Loans held for investment | 539 | $ 561 |
Internal Risk, Percentage |  | 1.90% |
Commercial Banking | Commercial and multifamily real estate | Criticized | Criticized nonperforming |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
2020 | 0 |  |
2019 | 0 |  |
2018 | 1 |  |
2017 | 9 |  |
2016 | 1 |  |
Prior | 60 |  |
Total Term Loans | 71 |  |
Revolving Loans | 0 |  |
Revolving Loans Converted to Term | 0 |  |
Loans held for investment | 71 | $ 38 |
Internal Risk, Percentage |  | 0.10% |
Commercial Banking | Commercial and industrial |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
2020 | 2,756 |  |
2019 | 11,504 |  |
2018 | 5,428 |  |
2017 | 3,655 |  |
2016 | 2,204 |  |
Prior | 4,269 |  |
Total Term Loans | 29,816 |  |
Revolving Loans | 18,886 |  |
Revolving Loans Converted to Term | 85 |  |
Loans held for investment | 48,787 | $ 44,263 |
Internal Risk, Percentage |  | 100.00% |
Commercial Banking | Commercial and industrial | PCI loans |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment |  | $ 10 |
Internal Risk, Percentage |  | 0.00% |
Commercial Banking | Commercial and industrial | Noncriticized |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
2020 | 2,712 |  |
2019 | 11,031 |  |
2018 | 5,085 |  |
2017 | 3,290 |  |
2016 | 2,098 |  |
Prior | 4,149 |  |
Total Term Loans | 28,365 |  |
Revolving Loans | 17,504 |  |
Revolving Loans Converted to Term | 82 |  |
Loans held for investment | 45,951 | $ 42,223 |
Internal Risk, Percentage |  | 95.40% |
Commercial Banking | Commercial and industrial | Criticized | Criticized performing |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
2020 | 32 |  |
2019 | 380 |  |
2018 | 324 |  |
2017 | 287 |  |
2016 | 95 |  |
Prior | 120 |  |
Total Term Loans | 1,238 |  |
Revolving Loans | 1,172 |  |
Revolving Loans Converted to Term | 3 |  |
Loans held for investment | 2,413 | $ 1,620 |
Internal Risk, Percentage |  | 3.70% |
Commercial Banking | Commercial and industrial | Criticized | Criticized nonperforming |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
2020 | 12 |  |
2019 | 93 |  |
2018 | 19 |  |
2017 | 78 |  |
2016 | 11 |  |
Prior | 0 |  |
Total Term Loans | 213 |  |
Revolving Loans | 210 |  |
Revolving Loans Converted to Term | 0 |  |
Loans held for investment | $ 423 | $ 410 |
Internal Risk, Percentage |  | 0.90% |

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