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Fair Value Measurement - Equity Securities Without Readily Determinable Fair Value (Details)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
May 06, 2024
shares
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
shares
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
shares
Sep. 26, 2024
Sep. 25, 2024
Dec. 31, 2023
USD ($)
Fair Value Disclosures [Abstract]                
Carrying value   $ 3,660 $ 4,499 $ 3,660 $ 4,499     $ 4,500
Upward carrying value changes   42 50 72 90      
Downward carrying value changes/impairment   (72) $ (17) (248) $ (150)      
Cumulative upward carrying value changes   1,100   1,100        
Cumulative downward carrying value changes/impairment   $ (1,500)   $ (1,500)        
VISA | Class B-2 Common Shares                
Equity Securities without Readily Determinable Fair Value [Line Items]                
Interest owned in equity securities without readily determinable fair value (in shares) | shares   18.6   18.6        
Conversion rate           1.5430 1.5875  
VISA | Class B Common Shares                
Equity Securities without Readily Determinable Fair Value [Line Items]                
Interest owned in equity securities without readily determinable fair value (in shares) | shares     37.2   37.2      
VISA | Class B-1 Common Shares                
Equity Securities without Readily Determinable Fair Value [Line Items]                
Interest in equity securities without readily determinable fair value exchanged (in shares) | shares 37.2