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Business Combinations - Additional Information (Details)
shares in Millions
 1 Months Ended 12 Months Ended
Dec. 01, 2022
USD ($)
shares
Dec. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
branch
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
Business Acquisition [Line Items]            
Repayment of debt     $ 4,084,000,000 $ 6,926,000,000 $ 11,432,000,000  
Merger and integration charges     1,009,000,000 329,000,000 0  
Goodwill   $ 12,373,000,000 12,489,000,000 12,373,000,000 $ 10,262,000,000 $ 9,918,000,000
Goodwill deductible for tax purposes $ 0          
Financing receivable, allowance for credit loss   6,936,000,000 $ 7,379,000,000 $ 6,936,000,000    
MUFG Union Bank Branches | Disposal Group, Disposed of by Sale, Not Discontinued Operations            
Business Acquisition [Line Items]            
Number of branches divested | branch     3      
Deposits divested     $ 400,000,000      
Loans divested     $ 22,000,000      
Common Stock            
Business Acquisition [Line Items]            
Issuance of stock (in shares) | shares     28 48 5  
Common Stock | Affiliate of MUFG            
Business Acquisition [Line Items]            
Issuance of stock (in shares) | shares     24      
MUB            
Business Acquisition [Line Items]            
Cash portion of purchase price 5,500,000,000          
Target tangible book value 6,250,000,000          
Tangible book value 3,500,000,000          
Repayment of debt     $ 936,000,000      
Merger and integration charges     $ 1,000,000,000 $ 329,000,000    
Goodwill 2,323,000,000          
Acquired receivables fair value 52,932,000,000          
Acquired receivable unpaid principal balance 56,120,000,000          
Increase to provision for credit losses       $ 662,000,000    
MUB | PCD Loans            
Business Acquisition [Line Items]            
Financing receivable, allowance for credit loss 463,000,000          
Acquired receivables fair value 4,400,000,000          
Acquired receivable unpaid principal balance 5,100,000,000          
MUB | Non-PCD Loans            
Business Acquisition [Line Items]            
Acquired receivables fair value 48,500,000,000          
Acquired receivable unpaid principal balance $ 51,000,000,000          
Increase to provision for credit losses   $ 662,000,000        
MUB | Common Stock            
Business Acquisition [Line Items]            
Equity portion of purchase price (in shares) | shares 44