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Acquisition and Divestiture Activity ( Unaudited Pro Forma Results) (Details) - BBVA USA Bancshares, Inc. - USD ($)
$ in Millions
12 Months Ended
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