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Allowance for Credit Losses - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]        
Decrease to allowance for credit losses $ (20,053) $ (19,726) $ (17,192) $ (16,386)
Increase to retained earnings 303,082 292,332 285,899  
Allowance for credit losses 22,800      
Net addition to the allowance for credit losses 1,100      
Wholesale        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Decrease to allowance for credit losses (6,987) (6,486) (5,048) (4,371)
Net addition to the allowance for credit losses 726      
Consumer        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Net addition to the allowance for credit losses 416      
Retained earnings        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Increase to retained earnings $ 306,208 296,456 $ 277,177 $ 272,268
Cumulative effect of change in accounting principles        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Decrease to allowance for credit losses   587    
Cumulative effect of change in accounting principles | Wholesale        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Decrease to allowance for credit losses   (2)    
Cumulative effect of change in accounting principles | Retained earnings        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Increase to retained earnings   449    
Cumulative effect of change in accounting principles | Accounting Standards Update 2022-02        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Decrease to allowance for credit losses   587    
Cumulative effect of change in accounting principles | Accounting Standards Update 2022-02 | Retained earnings        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Increase to retained earnings   $ 446