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Loans - Commercial Banking: Risk Profile by Internal Risk Rating (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment | $ 265,809 | $ 245,899 | $ 254,473
PCI loans |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment | 126 | 135 |
Commercial Banking |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment | $ 74,508 | $ 70,333 |
Percentage of portfolio | 100.00% | 100.00% |
Commercial Banking | PCI loans |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment | $ 31 | $ 130 |
Percentage of portfolio | 0.00% | 0.20% |
Commercial Banking | Noncriticized |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment | $ 71,848 | $ 68,043 |
Percentage of portfolio | 96.50% | 96.80% |
Commercial Banking | Criticized | Criticized performing |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment | $ 2,181 | $ 1,848 |
Percentage of portfolio | 2.90% | 2.60% |
Commercial Banking | Criticized | Criticized nonperforming |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment | $ 448 | $ 312 |
Percentage of portfolio | 0.60% | 0.40% |
Commercial Banking | Commercial and multifamily real estate |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment | $ 30,245 | $ 28,899 |
Percentage of portfolio | 100.00% | 100.00% |
Commercial Banking | Commercial and multifamily real estate | PCI loans |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment | $ 21 | $ 22 |
Percentage of portfolio | 0.10% | 0.10% |
Commercial Banking | Commercial and multifamily real estate | Noncriticized |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment | $ 29,625 | $ 28,239 |
Percentage of portfolio | 97.90% | 97.70% |
Commercial Banking | Commercial and multifamily real estate | Criticized | Criticized performing |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment | $ 561 | $ 555 |
Percentage of portfolio | 1.90% | 1.90% |
Commercial Banking | Commercial and multifamily real estate | Criticized | Criticized nonperforming |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment | $ 38 | $ 83 |
Percentage of portfolio | 0.10% | 0.30% |
Commercial Banking | Commercial and industrial |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment | $ 44,263 | $ 41,091 |
Percentage of portfolio | 100.00% | 100.00% |
Commercial Banking | Commercial and industrial | PCI loans |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment | $ 10 | $ 108 |
Percentage of portfolio | 0.00% | 0.30% |
Commercial Banking | Commercial and industrial | Noncriticized |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment | $ 42,223 | $ 39,468 |
Percentage of portfolio | 95.40% | 96.10% |
Commercial Banking | Commercial and industrial | Criticized | Criticized performing |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment | $ 1,620 | $ 1,292 |
Percentage of portfolio | 3.70% | 3.10% |
Commercial Banking | Commercial and industrial | Criticized | Criticized nonperforming |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment | $ 410 | $ 223 |
Percentage of portfolio | 0.90% | 0.50% |
Commercial Banking | Small-ticket commercial real estate |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment |  | $ 343 |
Percentage of portfolio |  | 100.00% |
Commercial Banking | Small-ticket commercial real estate | PCI loans |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment |  | $ 0 |
Percentage of portfolio |  | 0.00% |
Commercial Banking | Small-ticket commercial real estate | Noncriticized |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment |  | $ 336 |
Percentage of portfolio |  | 98.00% |
Commercial Banking | Small-ticket commercial real estate | Criticized | Criticized performing |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment |  | $ 1 |
Percentage of portfolio |  | 0.30% |
Commercial Banking | Small-ticket commercial real estate | Criticized | Criticized nonperforming |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Loans held for investment |  | $ 6 |
Percentage of portfolio |  | 1.70% |

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