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Fee-Based Revenue from Contracts with Customers - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) segment | Jun. 30, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |
Segment reporting, number of segments | segment |  |  | 3 |
Noninterest income | $ 2,086 | $ 1,549 | $ 3,958 | $ 3,374
Asset Management Fees |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Noninterest income | 239 |  | 465 |
Brokerage fees |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Noninterest income | 2 |  | 2 |
BBVA USA Bancshares, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Brokerage account client assets | $ 5,400 |  | 5,400 |
BBVA USA Bancshares, Inc. | Brokerage fees |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Noninterest income |  |  | $ 2 |

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