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Derivative Instruments and Hedging Activities - Effect of Cash Flow Hedge Derivatives (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gain (loss) recognized in OCI $ 11 $ 0 $ (4) $ 0
Gain (loss) reclassified from AOCI to interest revenue (28) $ 0 (45) $ 0
Interest rate swaps | Cash Flow Hedging | Designated as Hedging Instrument        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gain (loss) recognized in OCI 11   (4)  
Gain (loss) reclassified from AOCI to interest revenue $ (28)   $ (45)