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Business Combinations - Additional Information (Detail) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Aug. 03, 2023
Dec. 01, 2022
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Mar. 31, 2023
Dec. 31, 2022
Business Acquisition [Line Items]                
Repayment of debt         $ 3,906 $ 5,398    
Business acquisition, transaction costs     $ 284 $ 42 838 239    
Goodwill     12,472   12,472     $ 12,373
MUFG Union Bank [Member]                
Business Acquisition [Line Items]                
Payments to acquire businesses, gross   $ 5,500            
Business combination, Recognized identifiable assets acquired and liabilities assumed, Financial liabilities   53,395            
Business combination, Recognized identifiable assets acquired and liabilities assumed, Deposits   86,110            
Repayment of debt $ 936              
Business combination tangible book value   3,500            
Business combination, price of acquisition, expected   6,250            
Business acquisition, transaction costs     284 $ 42 838 $ 239    
Goodwill   $ 2,326 $ 2,300   $ 2,300      
MUFG Union Bank [Member] | Common Stock [Member]                
Business Acquisition [Line Items]                
Proceeds from issuance of common stock during acquisition $ 24              
MUFG Union Bank [Member] | Common Stock [Member]                
Business Acquisition [Line Items]                
Business acquisition, Equity interest issued or issuable, Number of shares   44            
Home Street Bank [Member]                
Business Acquisition [Line Items]                
Business combination, Recognized identifiable assets acquired and liabilities assumed, Financial liabilities             $ 22  
Business combination, Recognized identifiable assets acquired and liabilities assumed, Deposits             $ 400