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Acquisition and Divestiture Activity ( Unaudited Pro Forma Results) (Details) - BBVA USA Bancshares, Inc. - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Business Acquisition [Line Items] |  |
Net interest income | $ 11,662 | $ 12,413
Noninterest income | 8,960 | 7,866
Net income | $ 7,475 | $ 4,928

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