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Goodwill and Intangible Assets - Components (Detail) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Intangible Assets by Major Class [Line Items] |  |  |  |
Goodwill, gross | $ 14,653 | $ 14,544 |  |
Goodwill | 14,653 | 14,544 | $ 14,533 | $ 14,519
Intangible assets, gross (excluding Goodwill) | 2,178 | 3,522 |  |
Accumulated amortization | (2,004) | (3,268) |  |
Intangible assets, net (excluding Goodwill) | 174 | 254 |  |
Intangible assets gross including Goodwill | 16,831 | 18,066 |  |
Total goodwill and other intangible assets, net carrying value | 14,827 | 14,798 |  |
Commercial MSRs, gross | 555 | 459 |  |
Commercial MSR, accumulated amortization | (255) | (185) |  |
Total commercial MSRs | $ 300 | $ 274 |  |
Intangible assets, remaining amortization period | 5 years 7 months 6 days | 5 years |  |
Commercial MSRs, amortization expense | $ 70 | $ 59 |  |
PCCR intangibles |  |  |  |
Schedule of Intangible Assets by Major Class [Line Items] |  |  |  |
Intangible assets, gross (excluding Goodwill) | 1,932 | 2,102 |  |
Accumulated amortization | (1,864) | (1,952) |  |
Intangible assets, net (excluding Goodwill) | $ 68 | $ 150 |  |
Intangible assets, remaining amortization period | 3 years 10 months 24 days | 3 years 8 months 12 days |  |
Core deposit intangibles |  |  |  |
Schedule of Intangible Assets by Major Class [Line Items] |  |  |  |
Intangible assets, gross (excluding Goodwill) |  | $ 1,149 |  |
Accumulated amortization |  | (1,148) |  |
Intangible assets, net (excluding Goodwill) |  | $ 1 |  |
Intangible assets, remaining amortization period |  | 2 months 12 days |  |
Other intangible assets |  |  |  |
Schedule of Intangible Assets by Major Class [Line Items] |  |  |  |
Intangible assets, gross (excluding Goodwill) | $ 246 | $ 271 |  |
Accumulated amortization | (140) | (168) |  |
Intangible assets, net (excluding Goodwill) | $ 106 | $ 103 |  |
Intangible assets, remaining amortization period | 6 years 8 months 12 days | 7 years 1 month 6 days |  |

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