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Derivative Instruments and Hedging Activities - Summary of Pre-tax (Gains) Losses From Derivatives Not Designated in as Hedging Instruments (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Net Revenues [Member] | Not Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Gain (Loss) on Derivative Instruments, Net, Pretax $ (4,332) $ (3,850) $ (12,315) $ (11,389)
Net Revenues [Member] | Not Designated as Hedging Instrument, Trading [Member]        
Derivative [Line Items]        
Gain (Loss) on Derivative Instruments, Net, Pretax 0 0 0 0
Net Revenues [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]        
Derivative [Line Items]        
Gain (Loss) on Derivative Instruments, Net, Pretax 9 (22) (1) (20)
Financial expenses [Member] | Not Designated as Hedging Instrument [Member]        
Derivative [Line Items]        
Gain (Loss) on Derivative Instruments, Net, Pretax 272 280 763 808
Financial expenses [Member] | Not Designated as Hedging Instrument, Trading [Member]        
Derivative [Line Items]        
Gain (Loss) on Derivative Instruments, Net, Pretax 4 4 (33) (46)
Financial expenses [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]        
Derivative [Line Items]        
Gain (Loss) on Derivative Instruments, Net, Pretax $ 0 $ 0 $ 0 $ 0